Open AccessGolden Shiner Notemigonus crysoleucas × Rudd Scardinius erythrophthalmus Hybrids: Gonad Histology and Spawning Trials
Author(s) -
Goodwin Andrew E.,
Grizzle John M.,
Tave Douglas,
Gibson Mike D.,
Barnett Jimmy,
Fiegel Don H.,
Beavers Berry F.
Publication year - 1994
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.1994.tb00186.x
Subject(s) - biology , hybrid , vitellogenesis , zoology , oocyte , anatomy , fishery , botany , embryo
Hybrid fish were produced in ponds by crossing golden shiners × rudd ( Notemigonus crysoleucas × Scardinius erythrophthalmus ) and rudd × golden shiners. Histologically, testes from the hybrids contained spermatocytes that resembled those of the parental species, but no sperm were observed. Lack of sperm in hybrids could have been a seasonal effect. The ovaries of both types of hybrids contained variable numbers of morphologically normal, vitellogenic oocytes and numerous abnormal oocytes in the chromatin nucleolar stage. Abnormal oocytes were necrotic or had irregularly shaped nuclei and clumped chromatin. Many oocyte nests contained infiltrating macrophnges. Spawning trials with F 1 hybrids did not result in spawning behavior or production of F 2 generation fish. Colden shiner × rudd hybrids are of reduced fecundity, but sterility was not conclusively demonstrated.