Proceedings of Southeastern Fish and Wildlife Conference

Prior to 2013, SEAFWA published the Proceedings of annual conferences. In 2014, SEAFWA began publishing the peer-reviewed Journal of the Southeastern Association of Fish and Wildlife Agencies.

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Article Year

Grackle Control As An Aid To White·winged Dove Management

Transects established to measure whitewing nesting success have revealed that doves are subject to heavy (50-75 percent of the eggs laid) nesting predation. Prior research (Blankinship's study in 1964-1965) has indicated that whitewing (Zenaida asiatica) production can be increased 100 percent if boat-tailed grackle (Cassidix mexicanus) numbers are controlled during the nesting season. This project was initiated in the Lower Rio Grande Valley of Texas in 1967 to determine the effects of grackle control on white-winged dove and grackle nesting success.

Philip K. Evans

Pages 296-298

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1972

A 2-Acre Enclosure For Tree Squirrel Research

Our study was designed to determine if a large outdoor enclosure is suitable for evaluating the shelter requirements of gray squirrels. We designed and tested an escape-proof enclosure to determine how many squirrels could be maintained without overpopulation, and to determine if reproduction would occur. A 2-acre area in a stand of mixed hardwood about 40 years old with low mast production and few den sites was selected in the West Virginia University Forest, II miles east of Morgantown.

H. Reed Sanderson

Pages 298-300

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1972

Monitoring Woodcock Singing Sites Through Sonagrams

The main objective of this project was to determine if sonagrams could be used to assess the number of different birds using a single woodcock singing ground. Earlier work showed that individual male woodcock could be distinguished by their peent call. Weather permitting, two singing sites near Morgantown, West Virginia, were monitored every other day from April 3-28, 1972. Birds using the sites were recorded and voice prints (sonagrams) were made of the peent call. "T' test comparisons of frequency and width of the peent sonagram showed only one bird using each site.

David E. Samuel

Pages 301-305

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1972

The Failure Of Largemouth Bass, Micropterus Salmoides Floridanus (Lesueur), To Spawn In Eutrophic, Over-Crowded Environments

Nonreproductive populations of adult largemouth bass have been found in a number of lakes. In all cases, these environments are characterized as highly eutrophic and over-crowded with bream and forage species. Reproductive failure was demonstrated to be due to a refusal ofthe adult population to spawn. Ripened ovaries were retained long after the spawning season and the deteriorated ova eventually reabsorbed. In some cases, only a portion of the adult largemouth bass population spawned, yet produced substantial yearclasses.

Robert L. Chew

Pages 306-319

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1972

Management Implications Of Bass Fishing Tournaments

This study was designed to assess the harvest of a bass fishing tournament and its effect oli the bass population of a lake. The data evaluated here are taken from a total of 2254 largemouth bass weighing an estimated 4419.5 pounds harvested during a three day (29-31 March, 1972) bass fishing tournament held at Lake Lanier, Georgia, a 38,000 acre reservoir. Of the 794 bass sexed by excising gonads, 504 (63.5%) were females. The largest male measured 19.1 inches (3 lb., II oz.) while the longest female was 23.8 inches (7 lb., 4 oz.).

John A. Holbrook II

Pages 320-324

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1972

Evaluationoflargescalereleaseprograms With Special Reference To Bass Fishing Tournaments

A study was conducted to assess the effectiveness of an extensive release program conducted in conjunction with the B.A.S.S. (Bass Anglers Sportsman Society) Tournament held on Lake Kissimmee and adjoining lakes, Osceola County. Florida. Largemouth bass (Micropterus salmoides) caught by tournament participants were to be released into Lake Kissimmee following weighing and counting by tournament officials. Fish in poor condition and mortalities incurred prior to release were included into an initial mortality estimate of 15.6% by number and 13.7% by weight.

B. E. May

Pages 325-334

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1972

A Summary Of Findings On The Nematode, Goezia Sp. In The Southeastern United States

Goezia was first detected in North America at Lake Hollingsworth in Central Florida during June, 1969 (Ware, 1970). A recently introduced population of striped bass, Morone saxatilis, was found to be infected by the nematode. The following year, three additional populations of striped bass were parasitized, located in Lakes Bentley, Parker, and Hunter in the same general area of Florida. The introduction of this parasite into Florida was at first believed to be related to the striped bass stocking program (Gaines and Rogers, 1971).

Dr. John L. Gaines, Jr.

Pages 334-335

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1972

Identification And Frequency Of Occurrence Of Four Forms Of Henneguya Found In Channel Catfish

The terms intracapillary, interlamellar, cutaneous and visceral are proposed as names for four working forms or categories of Henneguya spp. found in channel catfish. Guidelines for their proper identification are suggested and the severity and incidence of each form are documented. Disease workers in diagnostic laboratories often find it convenient to separate Henneguya spp. infections into forms based on the nature of induced lesions.

C. Douglas Minchew

Pages 336-340

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1972

Proposed Guidelines For States Planning Fish Disease Control Programs

When given the task of discussing guidelines for fish disease legislation, it occurred to me that a brief review of the history of the current laws, both good and bad, governing fish diseases might be in order. However, this idea was quickly discarded because the history of fish disease control in the United States is short and dates only from the mid-1950's, and its study serves only to point out the sparsity of control measures and their general lack of uniformity.

Thomas L. Wellborn, Jr.

Pages 341-344

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1972

Cage And Raceway Culture Of Striped Bass In Brackish Water In Alabama

Cage and raceway culture of striped bass, Morone saxatilis (Walbaum), in brackish water was conducted at the Marine Resources Laboratory, Dauphin Island, Alabama during the period 1July 1971 to 2 November 1971. The effects of two feeds and two feeding regimes on the growth, food conversion and survival of fingerlings cultured in \\12" mesh cages (I yd.3) were studied. Growth, food conversion and percentage survival was better among fish fed the trout chow. The feeding regime of four times daily enhanced growth and survival among fish fed either of the two diets.

Madison R. Powell

Pages 345-356

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1972

Protein Requirements Of Cage-Cultured Channel Catfish

Twenty suspended l-m3 cages were each stocked with 300 five- to six-inch channel catfish fingerlings to allow for the evaluation of five feeding regimens, each replicated four times. The experiment began April 15 and terminated October 21, providing for a 180-day feeding period. The daily feeding rate was 4% of biomass initially and decreased to 1.5% of biomass during the latter phase of the feeding trial. The experimental feeds were nutritionally complete, low-fiber, expanded (nonsinking) 3/ 16-inch diameter pellets.

R. T. Lovell

Pages 357-361

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1972

Evaluation Of A Multi-Species Catfish Pond

This study was designed to compare the growth, mortality, and catchability of three species of catfish, blue catfish (lctalurus furcatus), channel catfish (I. punctatus), and white catfish (I. catus), in an artificially fed fishing pond. After stocking in October, 1968, the pond was fished a total of 35 days in two years (1970 and 1971). All remaining fish were then removed. The pond was "contaminated" primarily by brown bullheads and bluegills, with bullheads accounting for 648 pounds of the 2320 pounds per acre removed at the end of the study.

John A. Holbrook II

Pages 361-367

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1972

Utilization Of Rainbow Trout, Salmo Gairdnerii Richardson, In A Double-Crop Fish Culture System In South Georgia

Techniques were investigated for growing rainbow trout, Salmo gairdnerii Richardson, from fingerlings to market size during the winter months in a recirculation, flowing water fish culture system where channel catfish, lctalurus punctatus (Rafinesque) are grown in summer. Trout stocked having a mean weight of 0.1 Ib had a mean weight of 0.7 Ib in approximately 100 days with a feed conversion ratio of 1.29 to I. Survival of the fish was 82%. Water quality parameters and control of parasite infestations during the culture period are also discussed.

Thomas K. Hill

Pages 368-376

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1972

Investigation Of Pond Spawning Methods For Fathead Minnows

For transfer of fingerling fathead minnows (Pimephales promelas) from spawning ponds to growing ponds, the optimum combination of brood-fish population density and sex ratio in the spawning pond was 19,200 fish per surface acre and five females to one male. Fingerling production from this combination amounted to 1,524,500 fish. Fathead minnows utilized spawning boards placed up to 5 ft deep, and they also utilized boards placed without reference to the substrate. Larger nest sites encouraged larger egg deposits.

Stephen A. Flickinger

Pages 376-391

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1972

Controlled Culture Of Largemouth Bass Fry

A method for the controlled production of largemouth bass, Micropterus salmoides, Lac. fry is described. The method was based upon use of artificiallyfed brood fish which were stocked into small earthen ponds equipped with nylon felt spawning mats. Eggs deposited on the mats were separated, cleaned and incubated in a Heath Vertical Incubator. Fry hatched in one to two days and were held until swimup in holding troughs or shipped during the yolk sac absorption stage.

J. R. Snow

Pages 392-398

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1972

Midge Larvae Control In Commercial Catfish Ponds: Toxicity Of Abate(r) To Channel Catfish (Ictalurus Punctatus)

Populations of midges are a general nuisance around commercial catfish ponds in the Mississippi Delta, Abate(R) [(O,O,O',O'-tetramethyl O,O'-thiodi-pphenylene phosphorothioate) American Cyanamid Company] is recommended for midge larvae control in aquatic areas at a concentratIOn of about 2 ppb. Data in this study show that the LC50 ofAbate to channel catfish is between 5 and 7 ppm. This represents a wide safety margin that should insure Abate to be non-toxic to channel catfish when used at the recommended rate for midge larvae control.

Howard Chambers

Pages 399-401

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1972

Stake Beds As Crappie Concentrators

In 1968 fisheries personnel of the Tennessee Game and Fish Commission began constructing and evaluating stake beds made of sawmill strips as tools to help fishermen harvest more crappie from Kentucky Reservoir. They are: hammer d riven type; driver driven type; portable pre-fab type. Crappie concentrate readily on all three types with variations occurring due to location and seasonal fish movement. Over 128 hours of documented fishing on stake beds by the author produced 6.6 crappie per hour as opposed to 1.8 crappie per hour on control cover areas.

Gedeon D. Petit. III

Pages 401-406

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1972

Differential Retention Of Five Floy® Tags On Largemouth Bass (Micropterus Salmoides) In Hatchery Ponds

Floy® dart tag (FD-67 international orange) loss of 78% was discovered among largemouth bal's held in hatchery pond~ for three months.Sepa!a!io~of the #20 tubing from its monofilament anchor accounted for 81% of the losses, while dislodgement of the anchor from fish occurred in only 19% of the losses. Since ponds were free of vegetation which could entangle the tag and contained only tagged bass and bait fish, tag loss was assumed to be the result of bass pulling tags from each others' backs.

Robert L. Wilbur

Pages 407-413

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1972

Standing Crop Of Fishes As An Estimate Of Fish Production In Small Bodies Of Water

Sampling of fish for the purpose of estimating standing crop, annual net production, and the degree of relationship between these two variables was carried out in four Oklahoma farm ponds in 1965. Fish populations were assumed to be at or near the upper asymptotic level, and fishing was almost nonexistent. Annual rate of turnover varied less from one population to another than did standing crop. Turnover rates for most species appeared high, but this may be the normal situation in older ponds whose fish populations are not being harvested.

B. G. Whiteside

Pages 414-417

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1972

Ultrahigh-Frequency Electromagnetic Radiation Utilized For Aquatic Vegetation Control

An ultrahigh-frequency electromagnetic field (2,450 ±20 megahertz) is lethal to floating aquatic plants. Preliminary experiments indicate specie sensitivity varies within the duckweeds. Laboratory experiments indicate their Median Tolerance Limit is approximately 16.7 joules/ml, for our experimental conditions. However, field simulated experiments with soil banked test containers indicate higher energy levels will be necessary for field control.

Michael A. Champ

Pages 418-420

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1972

Rate Of Loss Of Ring And Spaghetti Tags On Flathead Catfish, Pylodictis Olivaris (Rafinesque)

During 1968-1971 a total of 494 flathead catfish were tagged with ring and/ or spaghetti tags. Of 175 recaptures, III were by the authors and 64 were by fishermen. Application of ring tags to the pectoral spine and spaghetti (T-bar, 1chor type) tags to the operculum is described. The anchor tags were applie t to the operculum by piercing the bone with the needle of the tag applicator. Ting tags of monel metal were held totally by encirclement of the base of the pectoral spine. Rates of tag loss were measured from fish marked and recaptured March 1968 through October 1971.

Robert C. Summerfelt

Pages 421-427

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1972

Levels Of Phosphorus And Nitrogen In Shenandoah River Water

In the period 1936-1941, smallmouth bass nests were counted in the Main Stem and South Fork of the Shenandoah River. Counts were made during the smallmouth bass spawning season when waters were clear, usually May 1-15. Due to eutrofication, the South Fork and Main Stem water now remains clear for only a few days. The enumeration and study of bass nests has been made more difficult due to the sudden development of blooms of algae. High levels of phosphorus and nitrogen in the South and North Forks and the Main Stem are believed to be the cause.

Eugene W. Surber

Pages 428-441

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1972

The Effect Of Acid Mine Drainage On The Limnology Of A Small Impoundment In Southwest Virginia

Apparently extensive fish mortalities were reported to have occurred in the North Fork Pound Reservoir during February, 1969 and February, 1970. A study was initiated in September, 1969 and continued through October, 1970, in order to ascertain the causes of these mortalities. Chemical water analyses disclosed that the lake pH varied from 4.0-6.4, with a mean near 5.0. The heavy metals, copper, mercury, zinc, iron and manganese were found in the lake waters at levels reported to have chronic effects on fish.

Robert E. Wollitz

Pages 442-460

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1972

Apparent Resistance To Pyrethroids In Organochlorine-Resistant Mosquitofish

Organochlorine-resistant mosquitofish from an insecticide contaminated environment in the Mississippi Delta showed a 3.4-fold tolerance to pyrethrum when compared to a susceptible strain. The 24-hr LC50 values for pyrethrum in susceptible and resistant mosquitofish were 27 and 93 ppb, respectively. Results of studies with sesamex, an inhibitor of mixed-function oxidase (mf0) enzymes, indicated that the tolerance to pyrethrum is partially, but not solely the result of increased levels of mfo enzymes.

David L. Fabacher

Pages 461-464

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1972

Effects Of Sub-Lethal Concentrations Of Phenol On Events In The Pre-Reproductive Period Of The Cladoceran, Daphnia Magna

The purpose of this investigation was to determine the effect of continuous exposure of pre-adult Daphnia magna to low, presumably sub-lethal doses of phenol. The experimental data were obtained through use of a standard 24-hour toxicity bioassay and a modified long-term toxicity bioassay. Control and test animals were cultured in a synthetic pond water and fed with dried yeast. Six concentrations of phenol were tested.

David T. Cox

Pages 464-472

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1972

The Influence Of Mirex Bait On Production And Survival Of Louisiana Red Crawfish, Procambarus Clarki (Girard)

An investigation was conducted concerning the effect of mirex bait on production and survival of red crawfish, Procambarus clarki (Girard), in rice fields of southern Louisiana. Twenty experimental plots were stocked with 2,000 brood crawfish (50 pairs per plot). Each plot was randomly assigned to one of four treatments: (1) conventional rice insecticides, malathion and carbofuran; (2) mirex alone; (3) mirex in conjunction with malathion and carbofuran, and; (4) untreated controls.

Kenneth M. Hyde

Pages 473-483

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1972

The Toxicity Of Zinc And Copper To Striped Bass Eggs And Fry With Methods For Providing Confidence Limits

Striped bass eggs, 24 hours after fertilization, and newly-hatched fry were tested to determine their sensitivity to zinc and copper. This study with those of Hughes will provide information on the most sensitive stage ofthesefish to acute exposure to lethal levels of zinc and copper. Newly-hatched fry were more sensitive to both zinc and copper than were eggs, but copper, at the lowest concentration used, retarded hatching. Eggs and fry were more sensitive to copper than to zinc.

Charles W. O'Rear, Jr.

Pages 484-489

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1972

The Benthic Macroinvertebrate Community Of The Greer's Ferry Reservoir Cold Tailwater, Little Red River, Arkansas

This study provides an evaluation of the benthic faunal characteristics of the cold tailwater of Greer's Ferry Reservoir on Little Red River. This Ozark stream is characterized by cold and non-turbid water, and periodic drastic vacillation of water level, the results of a deep water discharge for hydroelectric generation. For these reasons the benthic macroinvertebrate community is qualitatively limited. Pool and riffle habitats were sampled at six-week intervals at each of three stations established between 500 m-23 km below the dam.

Jerry L. McGary

Pages 490-500

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1972

Computer Assisted Instruction In Natural Resource Management

Teaching natural resource management is especially difficult because of the importance of experience in making management decisions. Most methods for allowing natural resource students to gain management experience in the classroom have not been entirely satisfactory. Computer implemented simulation of natural resource problems allows educators to provide management experience to students. TROUT, a learning exercise which simulates a coldwater lake fishery, is discussed as an example of the role of these teaching tools.

Franklin B. Titlow

Pages 500-505

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1972

Hybridization Between Dorosoma Cepedianum And D. Petenense In Lake Texoma, Oklahoma

The level of natural hybridization in Lake Texoma between Dorosoma cepedianum and D. petenense for the years 1962-63 and 1968-69 was determined to be 2.5 and 1.7% respectively. The two species have been sympatric in that reservoir since 1957. Male and female hybrids with well developed gonads were collected. Eggs from a hybrid were fertilized experimentally with milt of D. petenense and produced viable larvae. Hybrid fry were produced in the laboratory by crosses between D. cepedianum males and D. petenense females but not the reciprocal.

William L. Shelton

Pages 506-510

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1972

Growth Of Five Species Of Game Fishes Before And After Introduction Of Threadfin Shad Into Dale Hollow Reservoir

The possible effect of threadfin shad stocking in Dale Hollow Reservoir on the growth of five predatory species was measured by analysis of scale samples taken before and after threadfin stocking. There was no significant change in growth rate of largemouth bass, Micropterus salmoides; smallmouth bass, Micropterus dolomieui; and spotted bass, Micropterus punctulatus. There was a significant increase in growth rate of walleye, Stizostedion vitreum and white crappie, Pomoxis annularis.

James D. Range

Pages 510-518

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1972

Food Of Angler Harvested Largemouth, Spotted And Smallmouth Bass In Bull Shoals Reservoir

Stomachs from angler-harvested specimens of 259 largemouth bass, Mieropterus salmoides, 263 spotted bass, M. punctulatus, and 256 smallmouth bass, M. dolomieui were collected from the mid-lake region of Bull Shoals Reservoir during March 1971 - February 1972. Stomach contents were compared on the basis of frequency of occurrence, weight, and seasonal distribution of food items. Black basses were piscivorous in feeding habits during the summer and early autumn, with young of the year shad contributing substantially to the diets.

Larry R. Aggus

Pages 519-529

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1972

Largemouth Bass Growth In Relationship To Annual Variations In Mean Pool Elevations In Lake Carl Blackwell, Oklahoma

The growth history of largemouth bass in Lake Carl Blackwell is described. Variation in annual increments in growth of largemouth bass age groups I-III are examined in relationships to mean annual water level 1962 through 1967, when the annual average lake level was declining. Weighted mean average total lengths (mm) to the end of each year of life, i.e., to annulus formation which occurred in May, were: 140 (I); 279 (II); 369 (III); 425 (IV); 462 (V); 485 (VI); 504 (VII); and 53 I (VIII).

Paul L. Zweiacker

Pages 530-540

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1972

Length At Maturity And Total Length-Collarbone Length Conversions For Channel Catfish, Ictalurus Punctatus, And Blue Catfish, Ictalurus Furcatus, Collected From The Marshes Of Southwest Louisiana

This paper describes the results of a length and weight at maturity study of channel catfish, Ictalurus punctatus, and blue catfish, Ictalurusfurcatus. Total length-collarbone length and collarbone length-total length conversion factors were determined and are presented for future biological references. Data were collected from the marshes of Southwest Louisiana.

W. Guthrie Perry

Pages 541-553

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1972

Temperature-Light Effects On Growth, Food Consumption, Food Conversion Efficiency, And Behavior Of Blue Catfish, Ictalurus Furcatus (Lesueur)

Robert E. Tyler

Pages 553-565

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1972

Food Habits, Growth, And Length-Weight Relationships Of Young-Of-The-Year Black Crappie And Largemouth Bass In Ponds

Food, growth and length-weight relationships of young-of-the-year largemouth bass (Micropterus salmoides) and black crappie (Pomoxis nigromaculatus) were studied. Stomachs of 220 bass and 186 crappie were examined. Crappie fed mainly on zooplankton but consumed more aquatic insects as their size increased. Bass fed on zooplankton and aquatic insects, but grew faster when small crappie were available. Crappie grew faster when their numbers were reduced by bass predation. Length-weight relationships were calculated for 601 bass and 496 crappie.

William H. Tucker

Pages 565-577

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1972

The Feeding Ecology Of The Black And White Crappies In Beaver Reservoir, Arkansas, And Its Effect On The Relative Abundance Of The Crappie Species

Stomachs of black and white crappies (Pomoxis nigromaculatus and P. annularis) collected during the early impoundment (1964-1967) and the late impoundment (1969-70) periods from Beaver Reservoir were analyzed. Black crappie were dominant in the early impoundment period, whereas white crappie was the dominant crappie species in the late impoundment period.

Robert L. Ball

Pages 577-590

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1972

The Effect Of Calcium On The Osmotic Tolerance Of Juvenile Striped Mullet (Mugil Cephalus L.)

Juvenile striped mullet, ranging in size from 25 mm to 150 mm standard length and acclimated to 10% and 50% seawater, were subjected to direct transfer from acclimation salinity to salinity levels varying from distilled water to 200% seawater. Tests were also made using two commercially prepared, osmotically balanced, synthetic seawater mixes; one containing twice the normal calcium level and the other calcium-free. The presence of calcium significantly increased both survival time and survival rate. Acclimation tests also indicated a beneficial effect from increased calcium levels.

Andrew H. Auld

Pages 591-597

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1972

Lymphocystis Disease In Cynoscion Nothus, Cynoscion Regalis And Stellifer Lanceolatus From Georgia Estuaries

Lymphocystis disease is a viral disease of freshwater and marine fish. It was found in three species ofSciaenids along the Georgia coast. It was found in six of the eight estuaries sampled and appeared in three forms: cutaneous, visceral and ocular. The cutaneous and visceral lesions were typical. An ocular site of infection, however, had not been previously described. The lymphocystis cells were found in the choroid coat of the eye near blood vessels and transport of the virus to the infection site via the blood was suspected.

Frederick G. Smith

Pages 598-608

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1972

A Study On The Biochemistry Of Alarm Substances In Fish

Two cyprinid fishes, rlinostomus funduloides and Notropis cornutus were tested with naturally occurring substances including some well-known biogenic amines. Behavioral responses to histamine were similar to those observed in previous tests with natural alarm substance extracts. A response threshold was obtained at 0.01 ppm. Spectrophotofluorometric emission spectra also indicated that the natural alarm substance known to exist in many species of fish may be a ringed or double ringed compound.

J. R. Reed

Pages 608-610

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1972

Angler Harvest In Heated Fishing Docks On An Oklahoma Reservoir

In 1969-70 there were 50 active commercial, heated fishing docks on Grand Lake, a 18,818 hectare reservoir in northeastern Oklahoma. During the winterspring of 1969-70, fishermen interviews were made to determine fishermen catch statistics. Docks were sampled Friday through Monday during the period 28 January through 30 April 1970. A total of 1365 interviewed fishermen caught 3963 fish in 4462 hours of fishing (0.89 fish/ man-hour).

Dennis P. Lingenfelter

Pages 611-621

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1972

Catch Of Commercial And Game Fish With Four-Foot Trap Nets Of Various Mesh Sizes

The catch of commercial and game fish with 4-foot trap nets having minimum mesh sizes of 0.5,2, and 3-inch, square measure, were compared. A small trap net having 0.5-inch webbing in the crib has been used for many years to sample fish from Oklahoma reservoirs. Various investigators have indicated that this gear has potential as a commercial fishing device. However. large catches of game fish, especially white crappie, was a serious detriment to this potential.

Bobby G. Grinstead

Pages 621-627

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1972

An Economic Evaluation Of The 1970 Fishery In Lake Tohopekaliga, Florida

In 1970 the Florida Legislature provided for a table of values for fish killed by water pollution. These data were applied to standing crop estimates to determine the monetary value of the 1970 fishery in 22,700 acre Lake Tohopekaliga. The lim netic portion of the fishery was valued at $4,335,120 or $321.12 per acre. The littoral portion was valued at $12,266,636 or $1 ,333.33 per acre.

William Wegener

Pages 628-634

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1972

Mercury Concentration In Various Tissues Of The Bottlenose Dolphin (Tursiops Truncatus)

The mercury concentrations in various tissues of an adult bottlenose dolphin, Tursiops truncatus, were determined by nameless atomic absorption spectrophotometry. Mercury was concentrated in the kidneys and liver at levels in excess of 18 parts per million (dry weight basis). One sample from the right lobe of the liver contained 34.5 ppm mercury. With the exception of skin and subcutaneous tissue, a sample from the medulla oblongata and a bone sample (skull fragment), all samples run exceeded 1.0 ppm mercury.

Robert R. Stickney

Pages 634-636

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1972

The Effect Of Temperature On Food Evacuation Rate In The Pinfish (Lagodon Rhomboides), Spot (Leiostomus Xanthurus) And Silverside (Menidia Menidia)

Alimentary tract evacuation was stqdied by the serial slaughter method after a single unrestricted feeding on commercial pelletized food. Digestion rate was measured at 6, 12, 18, 24, and 30 C. At the lower temperatures there was a "latent" period immediately following ingestion during which the content of the stomach or alimentary tract did not decline.

D. S. Peters

Pages 637-643

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1972

Thermal Effects Of A Model Power Plant On The Hatching Success Of American Shad, Alosa Sapidissima, Eggs

A model power plant, constructed to simulate the time-temperature exposure histories experienced by organisms entrained in the intake of an actual plant, was used to study the thermal effects of an operating power plant on the hatching success of American shad, Alosa sapidissima, eggs. Eggs from a single female were divided into 5 sub-samples; two controls, and three experimental batches. One control was stocked immediately in a constant temperature bath.

J. R. Schubel

Pages 644-648

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1972

Steroid Assays And Their Usefulness In Fisheries Research

Techniques used to quantify circulating levels or stcroid hormones in teleostean fishes may help solve problems in fisheries research. Competitive protein binding assay used to determine levels of androgens. corticoids. and radioimmunoassay for estrogens allow analysis of relatively large numbers of samples within a short period of time. Results obtained by these methods indicate that rainbow trout (Salmo gairdlleri) have endocrine responses to various stressors. Repeated bleeding causes a marked lowering of plasma androgens in the male while cortlcoids arc increased in both sexes.

Carl B. Schreck

Pages 649-652

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1972

Prophets Of Doom ... Or Legitimate Concern?

Is it possible that you and I stand here today as an accomplice in one of the greatest crimes ever perpetrated against our natural resources? Are conservation agencies in America today failing to come to the rescue of an endangered specie called the American hunter? If wildlife conservation organizations in the United States were to learn today that an epidemic of hoof and mouth disease was spreading through out wildlife population, we would immediately sound the alarm.

Robert S. Baker

Pages 653-655

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1972

The Prophets Of Doom

Those of us who live and work in the southeastern part of the United States, who love nature and the great out-of-doors, are the most fortunate people in the world. Within the area that makes up this association may be found the most infinite variety of out-door recreation. There are rugged mountains with cold swift, tumbling rivers and streams gentle rolling land with quiet valleys and slow meandering streams, and flat, level lands with swamps and marshes. Natural and man-made lakes in addition to the free-flowing rivers make this area unique for water-oriented activitv.

Ray Henry

Pages 656-659

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1972

Regulating Wildlife Exhibitors, Importers And Exporters

Man has kept wild animals in captivity for thousands of years. He did it by necessity in the beginning to help in the hunt or, when the growl of an empty stomach outweighed the animal's advantage of hunting prowess, to place in the pot. "Civilized man," usually with a full stomach and leisure time, gradually developed a view of the animal kingdom from a perspective other than skewered over an open fire. He became fascinated by the unusual, awed by the brute strength, and amazed at the diversity of the world's fauna.

Lieutenant Don Ashley

Pages 660-665

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1972