Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

FREITAS, Tiago Magalhães da Silva; ALMEIDA, Vitor Hudson da Consolação; MONTAG, Luciano Fogaça de Assis; FONTOURA, Nelson Ferreira

Artigo

Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (...

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Autor principal:	FREITAS, Tiago Magalhães da Silva
Outros Autores:	ALMEIDA, Vitor Hudson da Consolação, MONTAG, Luciano Fogaça de Assis, FONTOURA, Nelson Ferreira
Grau:	Artigo
Idioma:	por
Publicado em:	Universidade Federal do Pará 2017
Assuntos:	Peixe-gato Auchenipteridae Reprodução animal Ciclo de vida animal Amazônia
Acesso em linha:	http://repositorio.ufpa.br/jspui/handle/2011/8907

id	ir-2011-8907
recordtype	dspace
spelling	ir-2011-89072017-10-16T12:27:24Z Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish FREITAS, Tiago Magalhães da Silva ALMEIDA, Vitor Hudson da Consolação MONTAG, Luciano Fogaça de Assis FONTOURA, Nelson Ferreira Peixe-gato Auchenipteridae Reprodução animal Ciclo de vida animal Amazônia Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L 50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G SI ). L 50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L 50 estimates increased to 13.05 cm for males and 13.7 cm for females when estimated from G SI values. LWR was adjusted by using a regular power function and through the polyphasic growth model, with proportionality and allometric coefficients changing in a two phases. The results indicate differences in the growth pattern concerning males and females, as well as polyphasic growth. The change in the growth pattern of the polyphasic LWR was estimated at 11.42 cm for males and 12.53 cm for females, suggesting that changes in the growth pattern can sign-out the attainment maturity in this catfish. O estudo da relação entre peso e comprimento é usado para investigar muitos aspectos do ciclo de vida dos peixes, mas não considera que o padrão de crescimento pode mudar durante o tempo vida, principalmente devido à maturação sexual. Desta forma, este estudo objetivou identificar o tamanho de primeira maturação do bagre Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) e testar se início do engajamento reprodutivo pode ser responsável por mudanças no padrão de crescimento da espécie, concernindo à relação peso/comprimento. Estimativas de tamanho de primeira maturação sexual (L50) foram realizadas por meio da identificação visual dos estágios de maturação e pelos valores do Índice Gonadossomático (IGS). O L50 foi estimado em 12,5 cm para machos e 13,0 cm para fêmeas quando aplicados a identificação visual dos estágios de maturação. A estimativa do L50 aumentou para 13,05 cm para machos e 13,7 cm para fêmeas quando aplicados os valores de IGS. A relação peso/comprimento foi ajustada utilizando uma função potência e pelo modelo de crescimento polifásico, com coeficientes de proporcionalidade e alométrico diferentes para duas fases. Os resultados indicam diferenças no padrão de crescimento de machos e fêmeas, além de um crescimento polifásico para ambos os sexos. A mudança no padrão de crescimento foi estimada em 11,42 cm para machos e 12,53 cm para fêmeas, sugerindo que essas mudanças podem estar associadas ao início da vida reprodutiva desse bagre. 2017-07-24T19:39:10Z 2017-07-24T19:39:10Z 2016 Artigo de Periódico FREITAS, Tiago Magalhães da Silva et al. Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish. Neotropical Ichthyology, Maringá, v. 14, n. 4, e150152, 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000400203&lng=pt&nrm=iso>. Acesso em: 24 jul. 2017. Epub 22-Dez-2016. <http://dx.doi.org/10.1590/1982-0224-20150152>. 1982-0224 http://repositorio.ufpa.br/jspui/handle/2011/8907 por Neotropical Ichthyology Acesso Aberto application/pdf Universidade Federal do Pará Brasil UFPA
institution	Repositório Institucional - Universidade Federal do Pará
collection	RI-UFPA
language	por
topic	Peixe-gato Auchenipteridae Reprodução animal Ciclo de vida animal Amazônia
spellingShingle	Peixe-gato Auchenipteridae Reprodução animal Ciclo de vida animal Amazônia FREITAS, Tiago Magalhães da Silva Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
topic_facet	Peixe-gato Auchenipteridae Reprodução animal Ciclo de vida animal Amazônia
description	Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L 50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G SI ). L 50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L 50 estimates increased to 13.05 cm for males and 13.7 cm for females when estimated from G SI values. LWR was adjusted by using a regular power function and through the polyphasic growth model, with proportionality and allometric coefficients changing in a two phases. The results indicate differences in the growth pattern concerning males and females, as well as polyphasic growth. The change in the growth pattern of the polyphasic LWR was estimated at 11.42 cm for males and 12.53 cm for females, suggesting that changes in the growth pattern can sign-out the attainment maturity in this catfish.
format	Artigo
author	FREITAS, Tiago Magalhães da Silva
author2	ALMEIDA, Vitor Hudson da Consolação MONTAG, Luciano Fogaça de Assis FONTOURA, Nelson Ferreira
author2Str	ALMEIDA, Vitor Hudson da Consolação MONTAG, Luciano Fogaça de Assis FONTOURA, Nelson Ferreira
title	Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
title_short	Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
title_full	Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
title_fullStr	Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
title_full_unstemmed	Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
title_sort	predicting size at first sexual maturity from length/weight relationship: a case study with an amazonian catfish
publisher	Universidade Federal do Pará
publishDate	2017
url	http://repositorio.ufpa.br/jspui/handle/2011/8907
_version_	1832602770715181056
score	11.755432

Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish

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