Data/hora: 03/06/2024 01:05:46

Biblioteca(s): | Embrapa Pantanal.
Data corrente: | 02/06/2006
Data da última atualização: | 30/04/2019
Autoria: | PEIXER, J.; MATEUS, L. A. F.; RESENDE, E. K.
Afiliação: | Department of Ecology, UNESP (Rio Claro, SP); Department of Animal Production, School of Veterninaty Medicine, Federal University of Mato Grosso (Cuiabá, MT); Embrapa Pantanal (Corumbá, MS).; EMIKO KAWAKAMI DE RESENDE, CPAP.
Título: | First gonadal maturation of Pinirampus pirinampu (Siluriformes: Pimelodidae) in the Pantanal, Mato Grosso do Sul State, Brazil.
Ano de publicação: | 2006
Fonte/Imprenta: | Brazilian Journal of Biology, v. 66, n. 1B, p. 317-323, 2006.
Idioma: | Inglês
Conteúdo: | Information regarding the reproductive cycle of commercially exploited fish species is extremely important for their appropriate management. The reproductive sexe of Pinirampus pirinampu (Spix, 1829) was determined for a population studied in the Pantanal wetlands of western Brazil. Samples were taken in September, October, and December 1997, and in February and March 1998. Gonodal stages were macroscopically determined and a monthly gonadossomatic index (GSI) was used to determine the breeding period. The length of the first gonadal maturation was determined by classifying male and female adults and immature fish into lenth classes. The data on the adult individuals were plotted on graphs and the median values estimated to find the length at which 50% of the individuals reached maturity (L50). L100 was also determined. Males and females in the gonadal maturation process were recorded from October on, and the highest frequency was found to occur in February. Individuals with empty gonads occured from February onwards. The GSI showed that gonadal development began in September and reached its peak in February. The L50 was 574 mm for females and 536 mm for males, while the L100 was 590 mm for females and 580 mm for males.
Palavras-Chave: | Pinirampus pirinampu.
Thesagro: | Reprodução.
Thesaurus Nal: | Pantanal; reproduction.
Categoria do assunto: | --
Registro original: | Embrapa Pantanal (CPAP)
Exemplares: | CPAP - (55210-1) - UPC - SP - PP - SP16702 -  - 16702 - DIS