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Enhanced larval survival in orange-spotted grouper (Epinephelus coioides) using optimized feeding regime
Aquaculture Research ( IF 1.9 ) Pub Date : 2022-03-27 , DOI: 10.1111/are.15850
Ritesh Ranjan 1 , Sekar Megarajan 1 , Biji Xavier 1 , Santhosh Bhaskaran Pillai 2 , Chinnibabu Bathina 1 , Ravi K. Avadhanula 1 , Shubhadeep Ghosh 1 , Boby Ignatius 3 , Imelda Joseph 3 , Achamveettil Gopalakrishnan 3
Affiliation  

Orange-spotted grouper, ideal finfish for mariculture, is constrained by the non-availability of sufficient seeds due to lower inconsistent larval survival. The present study attempted to establish a reliable larval rearing technique. Larvae fed with un-enriched or enriched rotifers (screened or unscreened) did not survive beyond 13 days post-hatch (DPH). Subsequently, copepod (Parvocalanus crassirostris) nauplii were supplemented at 0, 1, 2, 3 and 4 ml−1, in addition to enriched and screened rotifers, with live feed density of 12 ml−1, and this resulted in significantly improved survival at first feeding. Significantly higher (39.2%) larval survival on 16 DPH, with minimal size heterogeneity (13.13%), was observed in the group fed a combination of 2 copepod nauplii and 10 rotifers ml−1. However, mass mortality was observed between 18 and 21 DPH; and consequently, adult P. crassirostris were supplemented at 0, 0.25, 0.5, 0.75 and 1 ml−1 from 16 DPH along with rotifers, Artemia nauplii and artificial feed. Significantly higher larval survival on metamorphosis (40 DPH) was observed in the groups fed with 0.75 (17.71%) and 1 ml−1 (19.50%) P. crassirostris. Larval rearing protocol, with an average survival and length up to metamorphosis of 18.14% and 29.83 mm, respectively, during eleven cycles was developed. With consistent enhanced larval survival, the present study would facilitate mass scale seed production.

中文翻译:

使用优化的饲养方案提高橙斑石斑鱼 (Epinephelus coioides) 的幼虫存活率

橙斑石斑鱼是理想的海水养殖有鳍鱼,但由于幼虫存活率较低,无法获得足够的种子,这限制了它。本研究试图建立一种可靠的幼虫饲养技术。用未富集或富集轮虫(筛选或未筛选)喂养的幼虫在孵化后 (DPH) 后不能存活超过 13 天。随后,除了富集和筛选的轮虫外,还以0、1、2、3 和 4 ml -1补充桡足类 ( Parvocalanus crassirostris ) 无节幼体,活饲料密度为 12 ml -1,这导致第一次喂食时的存活率显着提高。在喂食 2 个桡足类无节幼体和 10 个轮虫 ml -1组合的组中,观察到在 16 DPH 时幼虫存活率显着提高 (39.2%),大小异质性最小 (13.13%) 。然而,在 18 至 21 DPH 之间观察到大量死亡率;因此,从 16 DPH 开始,以0、0.25、0.5、0.75 和 1 ml -1的浓度对成年P. crassirostris以及轮虫、卤虫无节幼体和人工饲料进行补充。在饲喂 0.75 (17.71%) 和 1 ml -1 (19.50%) P. crassirostris的组中观察到变态 (40 DPH) 的幼虫存活率显着提高. 开发了在 11 个周期内平均存活率和变态长度分别为 18.14% 和 29.83 毫米的幼虫饲养方案。随着幼虫存活率的持续提高,本研究将促进大规模种子生产。
更新日期:2022-03-27
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