Life History Traits of Hoplostethus Mediterraneus (Pisces: Beryciformes) From the North-Western Ionian Sea (Mediterranean Sea)
Life History Traits of Hoplostethus Mediterraneus (Pisces: Beryciformes) From the North-Western Ionian Sea (Mediterranean Sea)
复制标题
来自西北爱奥尼亚海（地中海）的地中海跳鱼（双鱼座：Beryciformes）的生活史特征
DOI：
10.1017/s002531540004011x
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发表时间：
1998
影响因子：
1.2
通讯作者：
M. Basanisi
中科院分区：
文献类型：
--
作者：
G. D’Onghia;A. Tursi;C. Marano;M. Basanisi
地中海Hoplostethus是西北爱奥尼亚海深海拖网捕鱼的副渔获物。在1993年8月至1995年7月期间，每隔两个月进行12次拖网调查，收集了其生活史特征的数据。本种按大小呈垂直分布。当年的年轻人主要是在春夏时期招募的。性别比例随大小而变化，雌性大于雄性。成熟标本主要在5 - 11月间发现，繁殖高峰在夏末。耳石呈季节性生长；雌性和雄性的最大年龄分别为11岁和10岁。整个种群的Von Bertalanffy生长参数为：L3C= 287-08 mm, k= 0-127 y, to= -2-131。两性之间的生长模式没有明显差异。通过尺寸分布分析所描述的整体生长性能与耳石读数所获得的无显著差异。对全体人口自然死亡率的估计在0-14至0-20之间。种群结构、生长格局、初成熟年龄和低自然死亡率表明其生活史主要由k策略性状构成，受密度依赖机制调控。
The fish Hoplostethus mediterraneus is a bycatch of the deep-water trawling in the north-western Ionian Sea. Data on its life history traits were collected during twelve trawl surveys carried out at two month intervals, between August 1993 and July 1995. A vertical distribution according to size was observed for this species. The year's young were recruited mainly during the spring-summer period. Sex-ratio changed by size with females larger than males. Mature specimens were found mainly between May and November with a reproductive peak during late summer. Seasonal growth was detected in the otoliths; the maximum ages of 11 and 10 y were observed in females and males respectively. Von Bertalanffy growth parameters for the whole population were: L3C=287–08 mm, k=0–127 y, to=-2–131. No significant differences were detected between the growth patterns of the sexes. Overall growth perfomance depicted through size-distribution analysis was not significantly different from that obtained by otolith reading. Estimates of natural mortality rate for the whole population ranged from 0–14 to 0–20. Population structure, growth pattern, age at first maturity and low natural mortality rate indicate a life history mainly constituted by k-strategy characters and regulated by density-dependent mechanisms.