A Study on the Effect of Moon Phase to the Hatching of Swordtip Squid (Uroteuthis Edulis)

月相對劍尖槍鎖管的孵化

張雅雯(Ya-Wen Zhang) ； 王凱毅(Kae-Yih Wang) ； 呂學榮(Hsueh-Jung Lu) ； 張可揚(Ker-Yang Chang)

《臺灣水產學會刊》 39卷4期 (2012/12) Pp. 209-222

https://doi.org/10.29822/JFST.201212.0001

摘要

劍尖槍鎖管是台灣北部火誘網漁業的主要漁獲，近10餘年來產量呈現逐年下降趨勢，令人擔憂。近年來有關劍尖槍鎖管人工培育開始發展，但在產卵行為等控制因素上卻尚未能瞭解，因此本研究於2010年1月至2010年10月期間採樣1,369尾鎖管，透過鎖管日輪推算孵化日，進而探討不同出生群之成長率、孵化日與環境之關係。研究結果顯示：臺灣東北部海域之鎖管系群為終年產卵，終年孵化，但秋末初春分別有兩次大量孵化時期。冬生群成長率為0.015，較其它季節出生群成長快速。觀察月相和孵化關係發現，不論哪一出生群，滿月期間（農曆11-19日）之孵化量高於朔月（農曆25-5）及新月（農曆6-10及20-25日）時期。顯示自然狀態下，環境光度與潮流是調控劍尖槍鎖管產卵行為的重要因素。

關鍵字

東海 ； 劍尖槍鎖管 ； 平衡石 ； 月相 ； 孵化

並列摘要

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.

並列關鍵字

East China Sea ； Uroteuthis edulis ； statolith ； moon phase ； hatching