Genetic Variability of Allozymes in Japanese Sea Bass <i>Lateolabrax Japonicus</i> in the Coastal Waters of Hyogo Prefecture

Abstract

In order to obtain basic information on the population structure of Japanese sea bass Lateolabrax japonicus, four sample lots were collected from coastal waters of Seto Inland Sea (Akashi, Murotsu, and Nandan) and from Japan Sea (Kasumi) in Hyogo Prefecture, Japan. Seventy-one to eighty speci mens from each locality were examined for the screening of polymorphism among 12 loci in 10 en zymes. Being fitted for Hardy-Weinberg equilibrium, it was suggested that each lot was derived from simple Mendelian population. The proportion of polymorphic loci ranged between 0.55-0.67 and the expected heterozygosity (He) were between 0.172-0.199. Considering these much higher values com pared with some other marine fishes, the high genetic variability should be retained in this species. The differentiations among localities were tested by chi-square values for heterogeneity. In MPI-1 * locus, highly significant difference (p<0.001) was detected in the case of Kasumi vs. each locality of Seto Inland Sea. The D values (0.0014-0.0082) were high, especially in the cases related with Kasumi (0.0054-0.0082). These results indicate the independence of the subpopulation of Kasumi from the others. Among the Inland lots, we could not get enough information about the existence of subpopula tion except for the cases of significant difference in sIDDH*.

Protein polymorphism and genetic variation in the catfish Synodontis schall (Bloch-Schneider, 1801) and S. serratus (Ruppel, 1829) from the White Nile (Sudan)

“…Recent successful application of biochemical genetic methods for identification has demonstrated the usefulness of electrophoretic techniques in identification of fish species for fisheries management (Smith, Jamieson & Birley 1990; Irnazarow & Bialowas 1995). Electrophoresis could easily detect polymorphism of enzymes and proteins and provide convenient material for studying the genetic changes in natural populations of fish (Kirpichnikov & Muske 1980; Ohtani, Miyahara & Shimamoto 1997). Protein electrophoresis had confirmed the morphological difference between and within species (Avise 1974; Buth 1984; Jean, Lee, Hui & Chen 1996).…”