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|Title: ||A Study on the Effect of Moon Phase to the Hatching of Swordtip Squid (Uroteuthis edulis)|
|Authors: ||Ya-Wen Zhang;Kae-Yih Wang;Hsueh-Jung Lu1;Ker-Yang Chang|
|Keywords: ||East China Sea;Uroteuthis edulis;Statolith;Moon phase;Hatching|
|Issue Date: ||2016-12-09T07:38:50Z
|Publisher: ||J. Fish. Soc. Taiwan|
|Abstract: ||ABSTRACT:The catch of swordtip squid (Uroteuthis edulis), one of the major target species of torch-light fisheries
in the northern Taiwan, showed declining trend in recent decades and became a highly concerned issue.
Swordtip squid artificial breeding is still impossible at present stage. Pool understanding of the control
factor for spawning behavior is an important reason. In order to understand the growth rate, timing of
hatch among different spawning seasons as well as its relationship with environment, we sampled 1,369
swordtip squids from January, 2010 to October, 2010. We back calculated the hatching day of swordtip
squid through growth increment reading of the statoliths. The results showed that spawning and hatching
occurred all year-round in the waters off northeastern Taiwan, but two massive hatching occurred in late
fall and early spring. The growth rate for winter cohort (0.015/yr) was higher than the other groups hatched
in the other seasons. No matter the squids hatched in what seasons, the hatch frequency during full moon
period (lunar days 11-19) were higher than those during new moon (lunar days 25-5) and crescent moon
(lunar days 6-10 and 20-25) periods. Under natural environment, ambient luminance and tidal condition of
spawning ground are important control factors for spawning behavior of swordtip squid.
|Relation: ||39(4), pp.209-222|
|Appears in Collections:||[環境生物與漁業科學學系] 期刊論文|
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