Abstract
Pimelodus maculatus Lacepede, 1803 is an important fish of the Säo Francisco river basin, where it is economically significant in both professional and sports fisheries. The fish, maintained in captivity, was subjected to hypophysation with crude caip pituitary extract. Approximately 70% of the females treated spawned viable eggs. The eggs were opaque, demersal, yellow and free. Egg stripping was performed at 213 hour-degrees (duration = 8.3 h) after the second dose injection, at water temperature of 25-26ºC. Hatching occurred at 394 hour-degrees (duration = 16.3 h) after egg fertilization, at water temperature of 24-25ºC. Egg fertilization rate was 64.8%. The relationship between absolute fecundity (AF), initial fertility (IF) and final fertility (FF) and body weight are expressed, respectively, by AF = - 331 + 181717 Wt (r² = 0.62), IF = - 16839+ 158123 Wt (r² = 0.65), and FF = -9874 + 100365 Wt (r² = 0.63).
Siluriformes; Pimelodus maculatus; yellow-mandi catfish; reproduction
Reproductive traits of the yellow-mandi catfish Pimelodus maculatus Lacépède (Osteichthyes, Siluriformes) in captive breeding
Yoshimi SatoI; Nelsy Fenerich-VeraniII; José Roberto VeraniII; Hugo Pereira GodinhoIII; Edson Vieira SampaioI
IEstação de Hidrobiología e Piscicultura de Três Marias, Covevasf. Caixa Postal 11, 39205-000 Três Marias, Minas Gerais, Brasil
IIDepartamento de Hidrobiología, Universidade Federal de São Carlos. Caixa Postal 676, 13565-905 São Carlos, São Paulo, Brasil
IIIInstituto de Ciências Biológicas, Universidade Federal de Minas Gerais. Caixa Postal 486, 30161-970 Belo Horizonte, Minas Gerais, Brasil
ABSTRACT
Pimelodus maculatus Lacepede, 1803 is an important fish of the Säo Francisco river basin, where it is economically significant in both professional and sports fisheries. The fish, maintained in captivity, was subjected to hypophysation with crude caip pituitary extract. Approximately 70% of the females treated spawned viable eggs. The eggs were opaque, demersal, yellow and free. Egg stripping was performed at 213 hour-degrees (duration = 8.3 h) after the second dose injection, at water temperature of 25-26ºC. Hatching occurred at 394 hour-degrees (duration = 16.3 h) after egg fertilization, at water temperature of 24-25ºC. Egg fertilization rate was 64.8%. The relationship between absolute fecundity (AF), initial fertility (IF) and final fertility (FF) and body weight are expressed, respectively, by AF = - 331 + 181717 Wt (r2 = 0.62), IF = - 16839+ 158123 Wt (r2 = 0.65), and FF = -9874 + 100365 Wt (r2 = 0.63).
Key words: Siluriformes, Pimelodus maculatus, yellow-mandi catfish, reproduction
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ACKNOWLEDGMENTS. The authors acknowledge and thank codevasf/cemig for the facilities put at their disposal for this study.
Recebido em 20.IV.1998; aceito em 09.IX.1999.
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Publication Dates
-
Publication in this collection
19 June 2009 -
Date of issue
1999
History
-
Received
20 Apr 1998 -
Accepted
09 Sept 1999