Winter mortality, growth, and behavior of young-of-the-year of four coastal fishes in New Jersey (USA) waters
Winter mortality, growth, and behavior of young-of-the-year of four coastal fishes in New Jersey (USA) waters
复制标题
美国新泽西州水域四种沿海鱼类幼鱼的冬季死亡率、生长和行为
DOI：
10.1007/s002270100571
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发表时间：
2001
期刊：
影响因子：
2.4
通讯作者：
Able K.
中科院分区：
文献类型：
--
作者：
L. Hales Jr;Able K.
冬季死亡率已被假设为选择大的身体尺寸在一年四季（YOY）的鱼类，但证实冬季死亡率及其原因（S）可用于少数河口或海洋物种。我们研究了四种常见海洋物种，黑海鲈鱼（Centropristis striata），tautog（Taautoga onitis），cunner（Taautogolabrus adspersus）和小口比目鱼（Etropus microstomus）的野生种群的季节长度分布，以及死亡率（即，在实验室中，在135天的时间内（1992年12月至1993年4月中旬），在冬季环境温度（平均7°C，范围2-13°C）下，对其YOY的死亡率（死亡频率）、生长和行为进行了研究，以确定其田间死亡的潜在原因。当2月水温下降到2-3°C时，一年中最年轻的黑海鲈鱼经历了100%的死亡率，强调了冬季从河口迁徙的重要性。两个labrid种，YOY tautog（14%）和YOY cunner（3%）的低死亡率，是符合他们的北方分布和全年发生在河口和近岸沃茨。实验室死亡率的YOY smallmouth比目鱼（33%）是较高的小型（<35毫米总长度）的鱼，这表明这种小物种可能会经历高的冬季死亡率在河口和近岸沿海沃茨。鱼体长度的季节性差异可能是由几种机制造成的（例如，死亡率和/或迁移），这是很难评估，但我们的实验室实验表明，季节性温度变化导致特定大小的死亡率的YOY小嘴比目鱼和离岸迁移的YOY黑海鲈鱼。
Winter mortality has been hypothesized to select for large body size in young-of-the-year (YOY) fishes, yet substantiation of winter mortality and its cause(s) are available for few estuarine or marine species. We examined seasonal length distributions of wild populations of four common marine species, black sea bass (Centropristis striata), tautog (Tautoga onitis), cunner (Tautogolabrus adspersus), and smallmouth flounder (Etropus microstomus), and mortality (i.e., frequency of death), growth, and behavior of their YOY in the laboratory at ambient winter temperatures (mean 7°C, range 2–13°C) during a 135-day period (December 1992 through mid-April 1993) to establish potential causes of their mortality in the field. Young-of-the-year black sea bass experienced 100% mortality when water temperatures decreased to 2–3°C in February, emphasizing the importance of winter emigration from estuaries in this southern species. The low mortality of two labrid species, YOY tautog (14%) and YOY cunner (3%), was consistent with their northern distribution and year-round occurrence in estuarine and nearshore coastal waters. Laboratory mortality of YOY smallmouth flounder (33%) was higher for small (<35 mm total length) fish, suggesting that this small species may experience high winter mortality in estuaries and nearshore coastal waters. Seasonal differences in fish length result potentially from several mechanisms (e.g., mortality and/or migration) that are difficult to assess, but our laboratory experiments suggest that seasonal temperature changes cause size-specific mortality of YOY smallmouth flounder and offshore migration of YOY black sea bass.