New Zealand Journal of Marine and Freshwater Research abstracts
Reproductive cycle, size at first maturation and fecundity in the golden
ling, Genypterus blacodes, in Chile
Felipe Paredes
Ricardo Bravo
Facultad de Ciencias del Mar
Universidad de Valparaíso
Casilla 5080, Reñaca
Viña del Mar, Chile
email: fparedesv@hotmal.com
Abstract Reproductive aspects of the golden ling, Genypterus
blacodes, from the southern Chilean fishery are presented. Gonad samples
were obtained from commercially caught fish between September 1999 and October
2000. Stage of sexual maturity, gonadosomatic index (GSI), and size of females
at 50% maturation determined by logistic methods and by plotting the mean
GSI by total length, are presented for both years. Batch fecundity was calculated
from subsampling mature ovaries containing oocytes in advanced stages of
maturity. Changes in GSI and monthly diameters of oocytes showed that ling
had a spawning season which extended between August and November. The sizes
at first maturity in 1999 and 2000 were 86.6 and 84.8 cm total length (TL),
respectively, using the logistic model, and 84 cm for both years using the
mean GSI-size plotting method. The mean batch fecundity was 333 330 oocytes
per individual for fish sized 85–120 cm TL. Fecundity increased with increasing
weight and total length.
Keywords Genypterus blacodes; reproductive cycle;
fecundity; sexual maturity, South of Chile
M04111; Online publication date 15 August 2005 Received 15 April 2004;
accepted 26 January 2005
New Zealand Journal of Marine and Freshwater Research, 2005, Vol. 39:
1085–1096
0028-8330/05/3905-1085 © The Royal Society of New Zealand 2005
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