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首页> 外文期刊>ICES Journal of Marine Science >Modelling carbon deposition and dissolved nitrogen discharge from sea cage aquaculture of tropical spiny lobster
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Modelling carbon deposition and dissolved nitrogen discharge from sea cage aquaculture of tropical spiny lobster

机译：模拟热带刺龙虾海笼养殖中的碳沉积和溶解氮排放

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摘要

The tropical spiny lobster, Panulirus ornatus, is farmed in floating sea cages situated in shallow coastal waters in many parts of the Asia-Pacific region. Despite the rapid expansion of this aquaculture activity, very little is known about its environmental impacts. This study combines computer modelling with previous laboratory measures to provide information on benthic carbon deposition and the production of dissolved inorganic nitrogen (DIN) from hypothetical sea cage aquaculture of spiny lobsters. Modelling scenarios were run with two different lobster aquaculture stocking densities (3 and 5 kg m(-3)) and various feed conversion ratios (FCRs) using natural seafood or artificial lobster diet (FCR 1.28-28). Simulations from the model showed that cumulative benthic carbon deposition varied from 0.1 to over 0.8 kg C m(-2) year(-1), while the mean DIN levels around sea cages ranged from 5.6 up to 25 mu g N l(-1) and the maximum DIN levels ranged from 10.8 to 165 mu g N l(-1). The results showed that feeding lobsters with seafood resulted in a markedly higher benthic carbon loading and release of DIN when compared with artificial lobster feed. Therefore, the elimination of the use of trash fish would greatly reduce the environmental impacts of spiny lobster aquaculture. Overall, the effects from spiny lobster aquaculture were spatially localized with the highest concentrations of carbon deposition and DIN directly beneath the sea cages. Therefore, it seems unlikely that spiny lobster aquaculture in sea cages will cause adverse environmental effects unless the lobsters are heavily stocked and supplied with poor quality feed.
机译：热带多刺龙虾Panulirus ornatus养殖在位于亚太地区许多地方的浅海沿岸的浮海网箱中。尽管这种水产养殖活动迅速扩大，但对其环境影响知之甚少。这项研究将计算机建模与以前的实验室措施相结合，以提供有关底栖碳沉积和假想龙虾海网箱养殖中溶解性无机氮（DIN）产生的信息。使用天然海鲜或人工龙虾饲料（FCR 1.28-28），以两种不同的龙虾养殖密度（3和5 kg m（-3））和各种饲料转化率（FCR）进行建模。该模型的模拟结果表明，底栖碳的累积沉积量从0.1到0.8 kg C m（-2）年（-1）不等，而海笼周围的平均DIN水平则在5.6至25μg N l（-1）之间。 ）和最大DIN含量范围为10.8至165微克N l（-1）。结果表明，与人工龙虾饲料相比，将龙虾与海鲜一起饲养会导致底栖碳含量和DIN的释放显着增加。因此，消除杂鱼的使用将大大减少多刺龙虾养殖的环境影响。总的来说，多刺龙虾养殖的影响在空间上是局部的，碳沉积和DIN的浓度最高，直接在海笼下面。因此，除非龙虾有大量放养并提供质量差的饲料，否则海笼中的刺龙虾养殖似乎不会对环境造成不利影响。

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