氯化法分离大型藻类中种子贻贝的效果评价

IF 1.1 Q3 FISHERIES Aquaculture, Fish and Fisheries Pub Date : 2023-11-13 DOI:10.1002/aff2.139
Bradley M. Skelton, Andrew G. Jeffs
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引用次数: 0

摘要

在沿海贻贝养殖场播种之前,在单种子苗圃培养系统中种植种子贻贝(贝)到更大的尺寸是在贻贝养殖的这一阶段大大减少昂贵的贝损失的有效方法。然而,在苗圃培养系统中,单种子贝贝的生产依赖于首先将贝与它们所附着的沉降基质分离,无论贝是在孵卵场定居还是从野外采集。本研究试图确定氯化是否可以作为一种有效的方法来分离从新西兰北部海滩收获的野生绿壳贻贝(Perna canaliculus)贝和海滩大藻(Kaitaia贝)材料。结果表明,氯化(即在次氯酸钠浓度高达0.625%的溶液中)是一种非常有效的分离唾液的方法,一次处理可导致高达94.6%的分离,而死亡率相对于对照组没有增加。氯化作用的效果受水珠密度的调节,水珠密度增加,脱离率降低。虽然氯化处理可以有效地分离小的贝氏体(即成功分离72.4%的贝氏体>750 μm)总体贝氏体密度,但需要进一步研究确定如何有效分离较大的贝氏体(即氯化处理仅成功分离21.5%的贝氏体>750 μm)。高存活率(相对于对照处理)也表明,本研究中使用的氯浓度和暴露时间可能会增加。这些结果表明,在将贝转移到苗圃系统生长之前,氯化处理可以将贝从基质中分离出来,为将这种减少贝损失的方法纳入水产养殖生产周期铺平了道路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Evaluation of separation of seed mussels from macroalgae using chlorination

Growing seed mussels (spat) to larger sizes in single-seed nursery culture systems prior to seeding onto coastal mussel farms is an effective approach for greatly reducing costly spat losses during this stage of mussel aquaculture. However, the production of single-seed mussel spat in nursery culture systems relies on first separating spat from the settlement substrata to which they are attached, whether spat are settled in a hatchery or gathered from the wild. This study sought to determine whether chlorination could be an effective approach for separating wild Greenshell mussel (Perna canaliculus) spat from beachcast macroalgal material (Kaitaia spat material) harvested from a beach in northern New Zealand. The results demonstrate that chlorination (i.e. in solutions of up to 0.625% sodium hypochlorite) is a highly effective approach for separating spat, resulting in the detachment of up to 94.6% in one treatment without increasing mortality relative to controls. The effectiveness of chlorination was modulated by spat density, with increasing spat densities, lowering rates of detachment. While chlorination is effective at separating small spat (i.e. successfully separating 72.4% of spat <750 μm in shell length) overall spat densities, further investigation is required to determine how to effectively separate larger spat (i.e. with chlorination only successfully separating 21.5% of spat >750 μm). The high survival (relative to the control treatments) also suggests that chlorine concentrations and exposure durations could be increased from those used in this study. These results demonstrate that chlorination can be used to separate spat from substrate prior to their transfer to nursery systems for ongrowing, paving the way for such approaches for reducing spat losses to be integrated into the aquaculture production cycle.

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