Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Chromosomal and electrophoretic analyses of hybrids between grass carp and bighead carp (Pisces: Cyprinidae).

Abstract

155 hybrids produced by crossing Hypophthalmichthys nobilis ♂♂ with Ctenopharyngodon idella ♀♀ included 101 diploid and 54 triploid individuals with 48 and 72 chromosomes resp. Compared with triploids, diploid hybrids showed a higher frequency of morphological abnormalities, and were generally smaller. Lactate dehydrogenase and esterase isozymes of the parent species were expressed in the hybrids. The data obtained were consistent with control of lactate dehydrogenase by the 3 known loci, A, B and C. The C locus was active only in the liver. Liver esterases were inherited codominantly.