Arnold G. Eversole

Approximately 48% of 211 American eel, Anguilla rostrata, collected from brackish portions of Cooper River, South Carolina, were infested with 1 or more ectoparasitic species representing 2 classes, Monogenea and Crustacea. Seasonal and host size- and age-related variations in the levels of parasitism of Ergasilus cerastes and E. celestis were observed. These variations in levels of parasitism are discussed with a proposed life history for E. cerastes in southern waters.

Gonadal condition of hard clams (Mercenaria mercenaria) planted at 2 tidal locations and at 3 population densities were evaluated in relation to age, size, sex, season, and culture condition. Changes in gonadal-somatic indices (GSI) reflected seasonal differences in gonadal development. Similar decreases in GSI were observed during the spring (May-Jun) and fall (Sep-Oct) spawning peaks. GSI varied significantly (P < 0.0001) with clam size and age. Larger clams had proportionally more gonadal tissue than smaller clams of the same age. Similarly, older clams had larger GSI than younger...

Malachite green, potassium permanganate, salt, formalin, Dylox, Furanace, antimycin A, Noxfish, copper sulfate, and Diquat were tested to determine 96-hour LCso values for the glass eel stage ofthe American eel, Anguilla rostrata(Lesueur). Static acute toxicity tests were conducted at 22 C using deionized water reconstituted to a hardness of 40-48 mgfl, an alkalinity of 30-35 mg/ I and a pH of 7.2-7.6. The calculated 96-hour LCso values for the chemicals are: malachite green 0.27 mg/I; potassium permanganate 3.06 mgfl; salt 17.88 gfl; formalin 83.96 mg/I; Dylox 1.31 mgfl; Furanace 0.77 mg/...