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首页> 外文期刊>Fisheries Research >Otolith-fish size relationship in juvenile gag (Mycteroperca microlepis) of the eastern Gulf of Mexico: a comparison of growth rates between laboratory and field populations
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Otolith-fish size relationship in juvenile gag (Mycteroperca microlepis) of the eastern Gulf of Mexico: a comparison of growth rates between laboratory and field populations

机译：墨西哥东部墨西哥湾幼鱼（Mycteroperca microlepis）耳石与鱼的大小关系：实验室种群和田间种群的增长率比较

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In this study, we conducted experiments on wild-caught juvenile gag Mycteroperca microlepis from the eastern Gulf of Mexico to evaluate the effect of food availability on somatic growth and otolith growth. Juveniles were fed at two different food levels until all fish attained similar sizes. We found that food availability significantly affected growth rates. However, we also found that this manifested itself in differential otolith size. That is, slower-growing gag had larger, heavier otoliths than equal-sized faster-growing gag; an experimental result that has been observed previously among various fish species. We wanted to apply these experimental results to field-caught gag because our initial observations indicated that gag from more southern latitudes along Florida's west coast were larger than gag from more northern latitudes, at least during the early juvenile period. Applying these relationships to regional field populations, we found that juvenile gag from the more northern latitudes appeared to grow faster than those from southern latitudes, using an otolith-fish size proxy for growth. However, examination of fish length-age relationships revealed that juvenile gag growth rates were not significantly different between regions. These results are contrary to the expectation that larger-sized gag from southern latitudes are growing faster, and suggests that other factors, such as spawning time and habitat quality may explain regional size differences.
机译：在这项研究中，我们对来自墨西哥湾东部的野生捕获的小嘴My Mycteroperca microlepis进行了实验，以评估食物供应对体细胞生长和耳石生长的影响。以两种不同的食物水平喂养幼鱼，直到所有鱼的体型都相似。我们发现，粮食供应量显着影响增长率。但是，我们还发现，这表现为耳石大小不同。也就是说，生长缓慢的插科动物比同等大小的生长快的插科动物具有更大，更重的耳石。先前在各种鱼类中观察到的实验结果。我们希望将这些实验结果应用于野外捕获的插科打because，因为我们的初步观察结果表明，至少在青少年早期，来自佛罗里达西海岸更多南部纬度的插齿大于来自更多北纬地区的插齿。将这些关系应用于区域野外种群，我们发现，使用耳石鱼大小的代名词，来自较北部纬度地区的幼体的生长似乎比来自南部纬度地区的幼体更快。但是，对鱼的长短关系的检查表明，各地区幼鱼的生长率没有显着差异。这些结果与人们预期的来自南部纬度的大型塞齿生长速度更快相反，并暗示其他因素（例如产卵时间和栖息地质量）可能解释了区域大小的差异。

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