Nursery culture of Haliotis rubra: the effect of cultured algae and larval density on settlement and juvenile production
Nursery culture of Haliotis rubra: the effect of cultured algae and larval density on settlement and juvenile production
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红鲍育苗：培养藻类和幼体密度对沉降和幼体产量的影响
DOI：
10.1016/j.aquaculture.2003.09.035
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发表时间：
2004
期刊：
影响因子：
4.5
通讯作者：
R. Day
中科院分区：
文献类型：
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作者：
S. Daume;S. Huchette;S. Ryan;R. Day
在本研究中，我们研究了商业规模使用绿色大型藻类Ulvella透镜来改善皱纹盘鲍幼体的定居和早期生长。对两种调节方法进行评估，比较培养4天和18天后复盖U型晶状体的平板。幼虫释放后3d，平均沉降率为62%。这是商业苗圃中有记录以来最高的比率之一，表明这种调节沉降板的技术是有效和可靠的。幼虫表现出明显的偏爱较老的盘子，具有较低的U型透镜盖。将幼虫按两种密度(每千只L罐50,000和100,000头，分别相当于约0.25和0.5头幼虫−-2底物)投放，以研究幼虫密度对总体沉降率和后期性能的影响。幼虫释放密度对沉降率无显著影响。沉降后，餐盘被随机排列，食物密度得到提高。一半的水箱接种培养的硅藻螺旋藻。另一半接受了自然发育的硅藻物种的混合，以确定在4个月的时间里对生长和存活的影响。我们证明，幼虫栖息的底物类型、光照(影响食物密度，但也可能影响生物膜边界层的氧气水平)和仔鱼密度对生长有非常显著的影响。落户后存活率与密度呈高度依赖关系，瞬时死亡率(M)从落户后第10天的43.7%下降到第22-天的5.4%。这些研究结果为红星天牛在苗圃的早期发育提供了重要的技术和生态信息，并表明使用U型透镜将大大改善苗圃的性能。
In the present study we investigated the use of a green macroalga Ulvella lens on a commercial scale to improve the settlement and early growth of Haliotis rubra larvae. Two conditioning methods were evaluated comparing plates covered with U. lens grown over 4 and 18 days. An average settlement rate of 62% was estimated 3 days after larval release. This rate is amongst the highest recorded in commercial nurseries, suggesting that this technique of conditioning the settlement plates was efficient and reliable. Larvae showed a clear preference for older plates with a lower cover of U. lens. Larvae were released at two densities (50,000 and 100,000 larvae per 1000 l tank representing approximately 0.25 and 0.5 larvae cm−2of substrate, respectively) to investigate if larval density influences overall settlement rate and later performance. Larval release density did not have a significant effect on settlement rate. After settlement, plates were randomised and the food density was enhanced. Half of the tanks were inoculated with the cultured diatom Navicula sp. and the other half received a mix of naturally developing diatom species, to determine the effect on growth and survival over a period of 4 months. We demonstrated that the type of substrate on which the larvae settled, light (which affects the food density but may also affect the oxygen level in the boundary layer of the biofilm) and the density of post-larvae have very marked effects on growth. Survival was strongly density-dependent after 64 days and the instant mortality rate (M) decreased from 43.7 in the first 10 days to 5.4 between 22 and 64 days after settlement. These results provide crucial technical and ecological information on the early development of H. rubra in the nursery and suggest that the use of U. lens will provide substantial improvements in nursery performance.
微生物的摄食行为及其多样性
DOI：
--
发表时间：
2022
期刊：
影响因子：
--
作者：
篠崎一世;万李成;中村重孝;藤本健造;八幡 穣
通讯作者：
八幡 穣