R. A. Dunham

Induction of Polyploidy with Hydrostatic Pressure in Striped Bass, White Bass, and Their Hybrids

Eggs of striped bass and white bass were subjected to hydrostatic pressures of 5,000, 6,000, 7,000, and 8,000 PSI for a duration of 5 minutes (2.5 minutes for 8,000 PSI) at 29, 45, or 55 minutes after fertilization. The most effective pressures for producing tetraploidy in white bass were 5,000 and 6,000 PSI and for striped bass 7,000 and 8,000 PSI. Late in the spawning season, only 45- and 55-minute treatments were effective for producing tetraploidy. The relative hatch of eggs subjected to hydrostatic pressure for tetraploid induction was 55% of controls. Original and reciprocal striped...

Biochemical Genetics of Largemouth Bass Populations in Alabama

Thirty-six enzyme loci were surveyed for 22 largemouth bass (Micropterus salmoides) populations from 7 watersheds in Alabama. Twenty-one loci were polymorphic. Nei's normalized genetic identity (I) and Rogers' genetic similarity (S) showed little divergence among the populations (I = 0.990 and S = 0.9792). However, several drainages contained unique alleles in frequencies greater than 0.05 and several alleles were identified that were not found in a previous nationwide survey. Significant intrapopulational heterogeneity was indicated by hierarchical F-statistics and contingency chi-square...

Length Variation in Species and Hybrid Populations of Blue, Channel, and White Catfishes

Blue catfish (lctalurus furcatus) , channel catfish (I. punctatus) , white catfish (I. catus) , and their hybrids channel x blue, blue x channel, channel x white, and white x blue were produced and grown to an average total length of 150 mm and weight of 30 g in earthen ponds. Blue catfish (P < 0.0 I) and white catfish (P < 0.02) were more uniform in length than channel catfish. The channel x blue hybrid was more uniform in length than its reciprocal blue x channel hybrid and channel catfish (P <0.02). Uniformity of channel x white and white x blue hybrids was not different from...