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Growth, Carcass Traits, and Oxygen Tolerance of Diploid and Triploid Catfish Hybrids
Author(s) -
Lilyestrom C. G.,
Wolters W. R.,
Bury D.,
Rezk M.,
Dunham R. A.
Publication year - 1999
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1577/1548-8454(1999)061<0293:gctaot>2.0.co;2
Subject(s) - catfish , biology , hybrid , ictalurus , ploidy , gonadosomatic index , zoology , development of the gonads , ovary , botany , anatomy , gonad , fishery , genetics , fecundity , fish <actinopterygii> , population , gene , demography , sociology
Allotriploidy was successfully induced in two hybrid catfishes: Female channel catfish Ictalurus punctatus × male blue catfish I. furcatus (3n = 87) and channel catfish × white catfish I. catus (3n = 82). No significant differences were detected in growth, feed conversion, gonadosomatic index, or dress‐out characteristics between diploid and triploid channel catfish × blue catfish raised in 1.3‐m‐diameter tanks, with the exception of a higher ( P = 0.03) condition factor ( K ) for triploid hybrids. All diploid hybrids had normal gonadal development and histology; however, triploid hybrids were probably not fertile and had abnormal gonadal development, with a single ovary present in 36% of the triploid females. Both testes were present in all males; however, triploid hybrid males had abnormal histology, with no sperm present in seminiferous tubules. Sex ratios did not differ from 1:1 at 14‐18 months of age. Growth rate, dress‐out percentage, and visceral fat percentage of diploids and triploids did not differ for either of the hybrids in ponds. Although not significantly different, dress‐out percentage of triploids was consistently lower than that of diploids. Head weight percentage did not differ between triploid and diploid channel × blue catfish. Tolerance of low dissolved oxygen was higher ( P < 0.05) for diploid hybrids than triploid hybrids. Survival of triploid hybrids was equal to or greater than that of diploid hybrids in ponds, but the differences were not statistically significant. Channel × white triploids were morphologically more similar to their maternal parent than their paternal parent; the opposite was observed for channel × blue triploids.