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Hormonal control of the reproductive cycle of the lusitanian toadfish, Halobatrachus didactylus
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Abstract(s)
O charroco, Halobatrachus didactylus, e um teleósteo marinho da família Batrachoididae que habita o Atlântico nordeste. É uma espécie bentónica que vive em
águas pouco profundas, geralmente abrigada em rochas ou tocas que utiliza como
locais de postura. Durante a época de reprodução, o charroco emite sons produzidos
pela bexiga gasosa que são, muito provavelmente, utilizados pelos machos para atrair
as fêmeas para os ninhos e em interacções agonísticas. Neste trabalho foi estudado o
ciclo reprodutivo de H didactylus na Ria Formosa (lagoa costeira no sul de Portugal).
Caracterizou-se o ciclo sazonal da maturação das gónadas e as alterações dos níveis
plasmáticos de esteróides sexuais ao longo da gametogénese e em relação as variações sazonais de algumas características sexuais secundárias. Esta espécie reproduz-se uma vez por ano no final da Primavera, início do Verão, e as fêmeas apresentam um desenvolvimento ovocitário síncrono por grupo. Os ovócitos crescem desde Novembro até Junho/Julho e são libertados numa única postura e colados ao substrato que constitui o ninho.
The Lusitanian toadfish, Halobatraclzus didactylus, is an eastern Atlantic marine teleost member of the family Batrachoididae. It is a sedentary benthic species that inhabits shallow waters and lives partly buried or concealed in rock crevices which are used as shelters and nesting sites. During the breeding season the Lusitanian toadfish produces sounds with the swimbladder which are thought to be mating and/ or agonistic calls. ln the present study the seasonal reproductive cycle of H. drkiacijvlos from the coastal lagoon Ria Formosa (south of Portugal) was determined by analysing the gonadal development and the changes in sex steroids throughout gametogenesis as well as seasonal alterations of secondary sexual characteristics. This species reproduces once a year during late spring-early summer. Females have group synchronous oocytes, which grow from November until June-July when they are released probably as a single batch.
The Lusitanian toadfish, Halobatraclzus didactylus, is an eastern Atlantic marine teleost member of the family Batrachoididae. It is a sedentary benthic species that inhabits shallow waters and lives partly buried or concealed in rock crevices which are used as shelters and nesting sites. During the breeding season the Lusitanian toadfish produces sounds with the swimbladder which are thought to be mating and/ or agonistic calls. ln the present study the seasonal reproductive cycle of H. drkiacijvlos from the coastal lagoon Ria Formosa (south of Portugal) was determined by analysing the gonadal development and the changes in sex steroids throughout gametogenesis as well as seasonal alterations of secondary sexual characteristics. This species reproduces once a year during late spring-early summer. Females have group synchronous oocytes, which grow from November until June-July when they are released probably as a single batch.