Santos Juan J S, Bernardes Juliana P, RamÍrez Juan R B, Gomes Carlos Henrique A DE Miranda, Romano Luis Alberto
Laboratório de Imunologia e Patologia de Organismos Aquáticos/LIPOA, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil.
Laboratório de Moluscos Marinhos/LMM, Universidade Federal de Santa Catarina/ UFSC, Florianópolis, SC, Brazil.
An Acad Bras Cienc. 2020;92 Suppl 1:e20190169. doi: 10.1590/0001-3765202020190169. Epub 2020 Jul 6.
Abstract: This study assessed the effect of salinity on embryonic development, larval growth and survival of the yellow clam Mesodesma mactroides in laboratory. Embryos and larvae of M. mactroides were submitted and maintained at four different salinities: 20, 25, 30 and 35 ppt, to determine optimal conditions for the species. Through descriptive analysis, the results showed that the embryos tolerate salinities between 25 - 35 ppt, presenting fast metamorphoses at salinities 30 and 35 ppt, during experimental period of 27 hours. The same tolerance pattern was observed in larval stage (25 - 35 ppt), showing a better development in salinity of 35 ppt. This result is verified in biometric analyzes of height and length of the shells and survival rate, with higher averages in treatments with salinity 35 ppt. The experimental period of this stage lasted 27 days, when the larvae were able to settle. These results indicate that embryos and larvae of M. mactroides tolerate salinities between (25-35 ppt), with the best growth and survival on high salinities being recommended to better yields in laboratory.
本研究在实验室评估了盐度对黄斑鸟蛤胚胎发育、幼体生长及存活的影响。将黄斑鸟蛤的胚胎和幼体置于20、25、30和35 ppt这四种不同盐度下进行培养，以确定该物种的最佳条件。通过描述性分析，结果表明，在27小时的实验期内，胚胎能耐受25 - 35 ppt的盐度，在30和35 ppt盐度下变态迅速。幼体阶段观察到相同的耐受模式（25 - 35 ppt），在35 ppt盐度下发育更好。这一结果在贝壳高度和长度的生物测量分析及存活率方面得到验证，盐度为35 ppt的处理组平均值更高。此阶段的实验期持续27天，幼体能够完成附着。这些结果表明，黄斑鸟蛤的胚胎和幼体能够耐受25 - 35 ppt的盐度，建议在高盐度条件下可实现更好的生长和存活，从而在实验室获得更高产量。
