|
|
|
|
|
| Lagardere, Jean-paul; Mariani, A. |
| During their spawning period (June to mid-July) in the Gironde estuary, meagre Argyrosomus regius produce two distinct sounds: regular long grunts, the most common calls, and sometimes also short grunts. It is suggested that long grunts serve the formation of spawning aggregations and short grunts announce the beginning of courtship behaviour. The meagre's long grunts include long series of 30-112 closely spaced pulses placed into call units. Each pulse produces multiple and rapidly decaying swimbladder vibrations with a dominant frequency varying between 336 and 444 Hz. (c) 2006 The Authors Journal compilation (c) 2006 The Fisheries Society of the British Isles. |
| Tipo: Text |
Palavras-chave: Spawning period; Sound production; Sonic muscle; Meagre. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-2184.pdf |
| |
|
|
| Queiroga,Fernando R.; Golzio,Jéssica E.; Santos,Raphaela B. dos; Martins,Tayná O.; Vendel,Ana Lúcia. |
| The present study investigated the reproductive biology of Sciades herzbergii in the Paraíba do Norte River Estuary, Brazil. We aimed to characterize the reproduction of the species with respect to sex ratio, spawning season, condition factor and length at first maturity. Specimens were captured between August 2009 and July 2010 in a stretch of the main channel of the estuary. In the laboratory, they were measured, weighed and macroscopically classified with regard to sex and gonad development stage, and their gonads were weighted. The monthly distribution of the sexes and their respective stages of maturation were determined. The gonadosomatic index (GSI), condition factor (K) and the length at first maturity were calculated for males and females. The sex... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Condition factor; Gonadosomatic index; Mean length at first maturity; Paraíba do Norte River Estuary; Pemecou sea catfish; Spawning period. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702012000500002 |
| |
|
|
|
