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首页> 外文期刊>Aquaculture >High-density nursery culture of recently-settled blue king crabs (Paralithodes platypus): Comparisons to red king crabs (Paralithodes camtschaticus)
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High-density nursery culture of recently-settled blue king crabs (Paralithodes platypus): Comparisons to red king crabs (Paralithodes camtschaticus)

机译：最近定居的蓝色帝王蟹（Paralithodes platypus）的高密度苗圃文化：与红色帝王蟹（Paralithodes camtschaticus）的比较

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Stock enhancement through the release of cultured juveniles has been suggested as a possible recovery tool for depleted red (Paralithodes camtschaticus) and blue (Paralithodes platypus) king crab populations in Alaska, USA. Considerable progress has been made in the past decade in red king crab culture technology, but similar technologies are less developed for blue king crabs. As part of a stock enhancement feasibility study, hatchery-raised blue king crab juveniles were cultured from larvae of ovigerous females collected off Saint Matthew Island, Alaska. Juvenile instars were then cultured in indoor nursery containers for 42 days at stocking densities of 500, 1000, 2000, 4000, and 6000 crabs m(-2) starting at metamorphosis to the first instar stage (C1). At day 42, survival was above 90% at all the densities, but had a slightly decreasing trend that ranged from 96% at 500 crabs m(-2) to 90% at 6000 crabs m(-2). The numbers of crabs cannibalized increased with density, but the overall increase in crab biomass offset the negative effects of cannibalism. Survival rates and biomass production for the first 42 days post-settlement is much higher for blue king crabs compared to red king crabs reared under identical conditions. The low rate of cannibalism implies that blue king crabs are well suited for large-scale hatchery culture. Our results suggest that these two closely related crab species can be reared at different stocking densities immediately flowing settlement and that high densities will maximize hatchery efficiency for blue king crabs. Future studies should investigate longer term nursery culture, beyond 42 days, to refine protocols for extended blue king crab rearing. Improving nursery techniques will boost the productivity and financial viability of a large-scale stock enhancement program
机译：有人建议通过释放养殖的幼体来增强种群，这是美国阿拉斯加的红（Paralithodes camtschaticus）和蓝（Paralithodes platypus）王蟹种群减少的一种可能的恢复工具。在过去的十年中，红色帝王蟹养殖技术已经取得了相当大的进步，但是对于蓝色帝王蟹而言，类似的技术还很少开发。作为种群增加可行性研究的一部分，孵化场饲养的蓝帝王蟹幼鱼是从阿拉斯加圣马修岛采集的有卵雌性鱼的幼虫养殖的。然后将幼龄幼虫在室内苗圃容器中以密度为500、1000、2000、4000和6000的螃蟹m（-2）在变态到幼龄期（C1）开始培养42天。在第42天，所有密度下的存活率均高于90％，但有轻微下降的趋势，范围从500蟹m（-2）的96％到6000蟹m（-2）的90％。食蟹的数量随着密度的增加而增加，但是蟹生物量的总体增加抵消了食人的负面影响。与在相同条件下饲养的红色帝王蟹相比，蓝色帝王蟹在定居后42天的成活率和生物量生产要高得多。自相残杀的比率很低，这说明蓝帝王蟹非常适合大规模孵化场养殖。我们的研究结果表明，这两种密切相关的蟹种可以在不同的放养密度下立即流动沉降，高密度将使蓝帝王蟹的孵化效率最大化。未来的研究应调查超过42天的长期苗圃文化，以完善延长蓝帝王蟹饲养的规程。改进苗圃技术将提高大规模库存改良计划的生产力和财务可行性

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