Ferosekhan Shajahan, Turkmen Serhat, Pérez-García Cathaysa, Xu Hanlin, Gómez Ana, Shamna Nazeemashahul, Afonso Juan Manuel, Rosenlund Grethe, Fontanillas Ramón, Gracia Anselmo, Izquierdo Marisol, Kaushik Sadasivam
IU-ECOAQUA, Universidad de Las Palmas de Gran Canaria, Taliarte, 35214 Telde, Spain.
ICAR-Central Institute of Freshwater Aquaculture, Bhubaneswar 751002, Odisha, India.
Animals (Basel). 2021 Feb 17;11(2):519. doi: 10.3390/ani11020519.
Genetic selection in gilthead seabream (GSB), has been undertaken to improve the growth, feed efficiency, fillet quality, skeletal deformities and disease resistance, but no study is available to delineate the effect of genetic selection for growth trait on GSB reproductive performance under mass spawning condition. In this study, high growth (HG) or low growth (LG) GSB broodstock were selected to evaluate the sex steroid hormones, sperm, egg quality and reproductive performance under different feeding regime of commercial diet or experimental broodstock diet containing either fish oil (FO) or vegetable oil (VO) based diet. Under commercial diet feeding phase, broodstock selected for either high growth or low growth did not show any significant changes in the egg production per kg female whereas egg viability percentage was positively ( = 0.014) improved by the high growth trait broodstock group. The experimental diet feeding results revealed that both growth trait and dietary fatty acid composition influenced the reproductive performance of GSB broodstock. In the experimental diet feeding phase, we observed high growth trait GSB males produced a higher number of sperm cells ( < 0.001) and also showed a higher sperm motility ( = 0.048) percentage. The viable egg and larval production per spawn per kg female were significantly improved by the broodstock selected for high growth trait and fed with fish oil-based diet. This present study results signifies that gilthead seabream broodstock selected on growth trait could have positive role in improvement of sperm and egg quality to produce viable progeny.
为了提高生长速度、饲料效率、鱼片质量、骨骼畸形和抗病能力，人们对金头鲷进行了遗传选择，但目前尚无研究描述在大规模产卵条件下，针对生长性状的遗传选择对金头鲷繁殖性能的影响。在本研究中，选择高生长（HG）或低生长（LG）的金头鲷亲鱼，以评估在商业饲料或含有鱼油（FO）或植物油（VO）的实验亲鱼饲料的不同投喂方式下，性类固醇激素、精子、卵子质量和繁殖性能。在商业饲料投喂阶段，选择高生长或低生长的亲鱼，每千克雌鱼的产卵量没有显著变化，而高生长性状亲鱼组的卵子活力百分比呈正相关（P = 0.014）提高。实验饲料投喂结果表明，生长性状和饲料脂肪酸组成均影响金头鲷亲鱼的繁殖性能。在实验饲料投喂阶段，我们观察到高生长性状的金头鲷雄鱼产生的精子细胞数量更多（P < 0.001），精子活力百分比也更高（P = 0.048）。选择高生长性状并投喂鱼油型饲料的亲鱼，每千克雌鱼每次产卵的活卵和幼体产量显著提高。本研究结果表明，根据生长性状选择的金头鲷亲鱼对提高精子和卵子质量以产生有活力的后代可能具有积极作用。
