|Title:||Age, growth and maturation of swordtip squid (Photololigo edulis) in the southern East China Sea.||Authors:||Kae-Yih Wang
|Keywords:||Photololigo edulis;age;growth;maturation;East China Sea||Issue Date:||Feb-2010||Journal Volume:||18||Journal Issue:||1||Start page/Pages:||99-105||Source:||Journal of Marine Science and Technology-Taiwan||Abstract:||
The reproductive biology, and age and growth of the
swordtip squid (Photololigo edulis) in the East China Sea were
examined based on the growth ring of statoliths from 1797
specimens during the period of November 2002 to November
2004. The maximum age observed was 261 days in female
and 253 days in male, an evidence showing that swordtip
squid has a longevity of about 9 months in both sexes. Growth
in mantle length (ML) and body weight (BW) in both sexes
was best described by the exponential model. There was significantly difference in somatic or statolith growth between
the sexes. However, absolute daily growth rates (DGRs) and
instantaneous relative growth rate (G) for ML and BW were
similar for both sexes until 200-220 days, after which they
became higher for males. In our samples, the youngest mature
squid was 139 days in female and 102 days in male. Females
matured about two months later in age than males in average.
The hatching season was throughout the year but with several
peaks, namely, October-November in 2002, March-April and
November in 2003, March in 2004. Therefore, we suggested
that swordtip squid has two main spawning seasons, spring
(March-April) and autumn (October-November).
|Appears in Collections:||環境生物與漁業科學學系|
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