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Survival and growth of the Caribbean scallops, Argopecten nucleus and Nodipecten nodosus, in suspended systems at different culture depths and net replacement frequencies
Aquaculture Environment Interactions ( IF 2.2 ) Pub Date : 2019-10-30 , DOI: 10.3354/aei00334
LA Velasco , J Barros

Survival of the Caribbean scallops Argopecten nucleus and Nodipecten nodosus in suspended culture is relatively low. The effects of culture depth and frequency of net replacement on survival and growth of both scallops were assessed, in addition to the effects on the amount of biofouling and presence of predators in the culture systems. Hatchery-produced juveniles were kept in pearl nets suspended at 3 different culture depths (6, 9 and 12 m) with 2 frequencies for net replacement (i.e. monthly and every second month, hereafter ‘bimonthly’). Survival of both scallop species was higher at 12 m depth. A. nucleus also showed higher growth rates at 12 m depth, while N. nodosus exhibited higher growth rates at 6 m depth. A. nucleus and N. nodosus performed best under monthly and bimonthly net replacement schemes, respectively. Frequency of presence and size of cymatid predators did not differ between treatments, but greater frequency and size of portunids occurred at bimonthly net replacement in A. nucleus culture nets. In most months, the biofouling dry biomass in the pearl nets was higher in those maintained at a depth of 6 m with bimonthly net replacement. The results indicate that the survival of both scallops could be improved by maintaining the culture systems suspended at a depth of 12 m, under lower temperature conditions, and applying a monthly net replacement scheme in A. nucleus in order to minimize the biofouling on the nets and a bimonthly scheme in N. nodosus in order to minimize scallop perturbation associated with net replacement.

中文翻译:

加勒比扇贝、Argopecten 核和 Nodipecten nodosus 在不同养殖深度和净更换频率的悬浮系统中的存活和生长

加勒比扇贝 Argopecten 核和 Nodipecten nodosus 在悬浮培养中的存活率相对较低。除了对养殖系统中生物污垢和捕食者存在的影响之外,还评估了养殖深度和净更换频率对两种扇贝的存活和生长的影响。孵化场生产的幼鱼被放置在悬挂在 3 个不同养殖深度(6、9 和 12 m)的珍珠网中,有 2 次换网频率(即每月和每两个月,以下称为“双月”)。两种扇贝物种的存活率在 12 m 深度较高。A. 细胞核在 12 m 深度也显示出更高的生长速率,而 N. nodosus 在 6 m 深度表现出更高的生长速率。A.nucleus 和 N. nodosus 分别在每月和双月净替换计划下表现最佳。cymatid 捕食者的存在频率和大小在处理之间没有差异,但在 A. 细胞核培养网中每两个月更换一次网时,portunids 出现的频率和大小更高。在大多数月份中,珍珠网中的生物污垢干生物量在保持在 6 m 深度并每两个月更换一次的珍珠网中较高。结果表明,通过在较低温度条件下将培养系统悬浮在 12 m 的深度,并在 A. 细胞核中应用每月一次的网更换计划以最大程度地减少网上的生物污垢,可以提高两种扇贝的存活率和 N. nodosus 的双月计划,以尽量减少与净置换相关的扇贝扰动。但在 A. 细胞核培养网中,每两个月更换一次网后,出现更大频率和大小的 portunid。在大多数月份,珍珠网中的生物污垢干生物量在保持在 6 m 深度并每两个月更换一次的珍珠网中较高。结果表明,通过在较低温度条件下保持悬浮在 12 m 深度的培养系统,并在 A. 细胞核中应用每月一次的网更换计划以最大程度地减少网上的生物污垢,可以提高两种扇贝的存活率和 N. nodosus 的双月计划,以尽量减少与净置换相关的扇贝扰动。但在 A. 细胞核培养网中,每两个月更换一次网时,出现更大频率和大小的 portunid。在大多数月份中,珍珠网中的生物污垢干生物量在保持在 6 m 深度并每两个月更换一次的珍珠网中较高。结果表明,通过在较低温度条件下保持悬浮在 12 m 深度的培养系统,并在 A. 细胞核中应用每月一次的网更换计划以最大程度地减少网上的生物污垢,可以提高两种扇贝的存活率和 N. nodosus 的双月计划,以尽量减少与净置换相关的扇贝扰动。
更新日期:2019-10-30
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