Laboratório de Piscicultura Marinha, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rodovia Admar Gonzaga, Florianópolis, Brazil.
Laboratório de Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina, Rodovia Admar Gonzaga, Florianópolis, Brazil.
J Fish Biol. 2024 Sep;105(3):791-800. doi: 10.1111/jfb.15841. Epub 2024 Jun 10.
The Lebranche mullet Mugil liza is a marine fish of great importance for artisanal and industrial fishing, as well as aquaculture. The use of live feeds during the larviculture phase of marine fish is a significant component of production costs. The present study evaluated the effects of the feeding transition on different larval stages of M. liza, from the combined supply of live feed (Brachionus rotundiformis + Artemia franciscana) and live + inert feed (Artemia franciscana + inert diet) until the weaning phase to only the inert diet. A total of 3240 M. liza larvae (weight 0.0133 ± 0.0062 g and length 0.793 ± 0.160 cm) were distributed among the 12 experimental units (n = 270), resulting in four groups with three replicates each. Treatment groups consisted of feed transition with A. franciscana (enriched metanauplii) to commercial inert feed starting weaning at four different larval ages: 28, 31, 34, and 37 days post hatching. Zootechnical performance indexes and intestinal histomorphometry were evaluated. Mortality, condition factor, and length variation coefficient did not show significant differences between treatments. Final weight, final length, weight gain, and length gain were significantly greater in larvae that started weaning at 31, 34, and 37 days post hatching. Weight coefficient of variation was significantly higher in larvae that started weaning at 28 days (67.51 ± 11.70) compared to 37 days (34.40 ± 7.30). In intestinal histology, villi height (180.3 ± 4.4) was significantly higher in larvae that started weaning at 37 days post hatching. Considering the evidence found in the present study, it is recommended to start weaning M. liza on the 31st day post-hatching, using a 2-day co-feeding protocol (31st and 32nd days). From the 33rd day after hatching, M. liza larvae can receive only commercial feed.
利布兰奇鲻 Mugil liza 是一种重要的海洋鱼类，对手工和工业捕捞以及水产养殖都很重要。在海洋鱼类的幼虫养殖阶段使用活饲料是生产成本的重要组成部分。本研究评估了从联合供应活饲料（旋口藻+卤虫无节幼体）和活+惰性饲料（卤虫无节幼体+惰性饮食）到断奶阶段仅使用惰性饮食的不同幼虫阶段的利布兰奇鲻的饲养过渡的影响。总共 3240 条利布兰奇鲻幼虫（体重 0.0133±0.0062g，体长 0.793±0.160cm）分布在 12 个实验单元（n=270）中，每个单元有三个重复。处理组包括从卤虫无节幼体（富营养体）向商业惰性饲料的饲料过渡，断奶时间为孵化后 28、31、34 和 37 天。评估了养殖性能指标和肠道组织形态计量学。各组间死亡率、条件因子和体长变异系数无显著差异。在孵化后 31、34 和 37 天开始断奶的幼虫的最终体重、最终体长、体重增长率和体长增长率显著更高。在孵化后 28 天（67.51±11.70）开始断奶的幼虫的体重变异系数显著高于孵化后 37 天（34.40±7.30）。在肠道组织学中，孵化后 37 天开始断奶的幼虫的绒毛高度（180.3±4.4）显著更高。考虑到本研究中的证据，建议在孵化后第 31 天开始断奶，采用 2 天的共同喂养方案（第 31 天和第 32 天）。从孵化后第 33 天开始，利布兰奇鲻幼虫只能接受商业饲料。
