Diel Reproductive Periodicity of Haddock in the Southwestern Gulf of Maine
Diel Reproductive Periodicity of Haddock in the Southwestern Gulf of Maine
复制标题
DOI：
10.1080/00028487.2013.864704
复制
发表时间：
2014-03-01
影响因子：
1.4
通讯作者：
Rountree, Rodney A.
中科院分区：
文献类型：
--
作者：
Burchard, Katie A.;Juanes, Francis;Rountree, Rodney A.
研究了缅因州海湾黑线鳕的种群，以确定其是否具有昼夜产卵周期性。租用了商业渔船，专门进行25次延绳钓旅行，在商业渔民确定为产卵聚集地的Stellwagen Bank国家海洋保护区收集性成熟的黑线鳕。为了研究昼夜对黑线鳕繁殖的影响，在24小时昼夜周期内，观察了黑线鳕各生殖成熟期的CPUE、雌雄比例以及性腺指数（GSI）的变化。不同成熟阶段的昼夜模式的比较，用于区分昼夜周期，由于产卵和摄食行为。昼夜周期观察到的比例，男性和女性的渔获量，比例和CPUE的男性和女性的成熟阶段最表明即将产卵，和女性GSI。虽然产卵在整个昼夜周期内都有发生，但雌性的产卵高峰出现在晚上（1700- 2100小时），并逐渐下降到白天0900小时的低值。在一个明显的矛盾，男性产卵阶段一致高，除了在夜间2100和0100小时之间的低点。我们假设，这种模式是一致的lekking行为，在求偶期间，产卵准备男性之间的激烈竞争会减少他们的进食活动在高峰产卵时间。昼夜周期的显著年度差异可能是由于产卵季节的时间模式不同或密度依赖性不同，或两者兼而有之。
We studied a population of Haddock Melanogrammus aeglefinus in the Gulf of Maine to determine whether it exhibits diel spawning periodicity. Commercial fishing vessels were chartered for 25 dedicated long-lining trips to collect sexually mature Haddock in the Stellwagen Bank National Marine Sanctuary at locations identified by commercial fishers as having spawning aggregations. In order to examine diel effects on Haddock reproduction, the changes in CPUE and percentages of male and female Haddock of all reproductive maturity stages, as well as gonadosomatic index (GSI), were observed across a 24-h diel cycle. The comparison of diel patterns among different maturation stages was used to differentiate diel periodicity due to spawning from feeding behavior. Diel periodicity was observed for the proportion of males and females in the catch, the proportion and CPUE of male and female maturation stages most indicative of imminent spawning, and for female GSI. Although spawning occurred throughout the diel cycle, peak spawning of females occurred during the evening hours (1700-2100hours) and gradually declined to low values during the day at 0900hours. In an apparent contradiction male spawning stages were uniformly high except for lows during the night between 2100 and 0100hours. We hypothesize that this pattern is consistent with lekking behavior where strong competition among spawning-ready males during courtship would reduce their feeding activity during the peak spawning hours. Strong annual differences in diel periodicity may have resulted from different temporal patterns in the spawning season or density dependence, or both.Received May 7, 2012; accepted November 1, 2013