In Brazil, mussel seed are not a plentiful natural resource, and so the efficient use of seeds by reducing stocking densities should be considered. There are very few studies addressing the relationship between seeding density and growth of mussels in tropical conditions. This work aimed to determine the influence of low seeding densities on the productive performance of Perna perna (Linnaeus) mussels cultivated on ropes in Caraguatatuba, Brazil. In October 2014, 12 ropes, one metre in length each, were seeded at the densities of 200, 300 and 400 mussels/m (four ropes for each density) and suspended on a long line. After 226 days of growing, mussels were harvested and their performance at each density was evaluated in terms of mean weight and length, production, culture efficiency, condition index, survival, amount of recruited seed, amount of fouling on the ropes and morphometric relationships. We observed no significant differences (p > .05) for these indicators among the densities tested, except for mussel biomass, which was significantly higher (p < .05) at the greater densities. A partial budget analysis showed that the density of 400 m⁻¹ showed better profitability and should be recommended, even in case of seed shortage.

中文翻译：

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在巴西卡拉瓜塔图巴低密度种植在绳索上的褐贻贝Perna perna（Linnaeus，1758）的生产性能

在巴西，贻贝种子不是丰富的自然资源，因此应考虑通过降低种群密度来有效利用种子。很少有研究解决热带条件下贻贝的播种密度与生长之间的关系。这项工作旨在确定低播种密度对Perna perna生产性能的影响（Linnaeus）贻贝在巴西卡拉瓜塔图巴的绳索上种植。2014年10月，以200、300和400贻贝/米的密度（每根密度4条绳索）播种了12条绳索，每条绳索各长1米（每根密度4条绳索），并悬挂在一条长线上。生长226天后，收获贻贝，并根据平均重量和长度，产量，培养效率，条件指数，存活率，新近吸收的种子量，绳索上的结垢量和形态计量关系评估贻贝在每种密度下的表现。我们发现， 在所测试的密度之间，这些指标没有显着差异（p > .05），除了贻贝生物量，在较高密度下，贻贝生物量明显更高（p  <.05）。部分预算分析表明，密度为400 m ^-1 表现出更好的盈利能力，即使在种子短缺的情况下也应推荐。