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Effect of food availability on the growth and age determination of European sardine (Sardina pilchardus Walbaum, 1792) larvae
Journal of the Marine Biological Association of the United Kingdom ( IF 1.2 ) Pub Date : 2021-08-03 , DOI: 10.1017/s0025315421000497
Susana Garrido 1 , Susana Ferreira 2 , Claudia Soares 2 , Isabel Meneses 3 , Nuria Baylina 4 , Hugo Batista 4 , Maria Alexandra Teodósio 2 , António Miguel Piecho-Santos 5 , Pedro Ré 6
Affiliation  

Accurate assessment of age and growth of fish is essential to understand population dynamics, namely for age-structured stock assessment and for determining vital rates of fish (e.g. age at sexual maturity) and their relationship with environmental variability. To validate the daily deposition in the otoliths of European sardine (Sardina pilchardus) larvae, these were reared with a range of food densities translating into feeding rates extending from less than required for maintenance to saturated feeding levels. When exogenous feeding began, a high variability in the relationship between number of growth increments (GI) and elapsed days after hatching (dph) was observed, irrespective of the feeding treatment. GI counts using a light microscope were less than one per day for larvae <15 dph (ranging from 0.17–0.43 GI day−1) and similar for larvae reared with different food concentrations. The rate of GI count vs age was significantly higher for larvae older than 15 dph. GI count from 3–30 dph was lower than one per day (0.45–0.75 GI day−1 95% CI) for fed larvae 3–30 dph. Scanning electron microscopy confirmed the daily deposition of GI and revealed some increment widths around 0.2 μm, particularly during the first week post-hatch. Otoliths of wild sardine larvae exhibited narrow GI (<0.5 μm) comparable with reared larvae. This study demonstrates that during the first weeks after hatch the daily increment deposition is underestimated using traditional light microscopy, which must be taken into account in future works determining wild sardine larval growth.

中文翻译:

食物供应对欧洲沙丁鱼 (Sardina pilchardus Walbaum, 1792) 幼虫生长和年龄测定的影响

准确评估鱼的年龄和生长对于了解种群动态至关重要,即对于年龄结构的种群评估和确定鱼的生命率(例如性成熟年龄)及其与环境变化的关系。验证欧洲沙丁鱼耳石的每日沉积情况(沙丁鱼) 幼虫,这些是在一系列食物密度的情况下饲养的,这转化为摄食率,从低于维持所需的摄食率延伸到饱和摄食水平。当外源喂养开始时,观察到生长增量(GI)和孵化后经过的天数(dph)之间关系的高度可变性,与喂养处理无关。对于 <15 dph 的幼虫(0.17-0.43 GI 天),使用光学显微镜的 GI 计数少于每天 1 个-1) 和以不同食物浓度饲养的幼虫类似。GI计数率对比大于 15 dph 的幼虫的年龄显着更高。3-30 dph 的 GI 计数低于每天 1 个(0.45-0.75 GI day-195% CI) 喂食幼虫 3-30 dph。扫描电子显微镜证实了 GI 的每日沉积,并显示了一些约 0.2 μm 的增量宽度,特别是在孵化后的第一周。野生沙丁鱼幼虫的耳石表现出与饲养幼虫相当的窄 GI (<0.5 μm)。这项研究表明,在孵化后的最初几周内,使用传统光学显微镜会低估每日增量沉积,在未来确定野生沙丁鱼幼虫生长的工作中必须考虑到这一点。
更新日期:2021-08-03
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