Selective utilization of fatty acids by Chinese sturgeon (Acipenser sinensisGray, 1835) during gonadal development and first year juvenile growth

Abstract

The aim of this study was to investigate the utilization of essential fatty acids by Chinese sturgeon Acipenser sinensis during gonadal development and juvenile growth stages. Muscles and eggs from stages II to V control-bred broodfish were sampled to analyze whether fatty acids were transferred from the muscle to the gonads. Fatty acids in the muscles of broodstock females were relatively stable from stages II to IV, whereas the total PUFA content, as well as the ratio of n-3/n-6 PUFA and DHA/EPA in stage V gonads were significantly higher than in the corresponding muscle tissue. Naturally spawned eggs collected from the Yangtze spawning area were hatched and cultured in the same environment and with the same feeding strategy as the closed-cycle controll-bred eggs and juveniles. However, the relative content of C18:1n-9 and C22:6n-3 in the naturally spawned eggs was significantly higher. Naturally spawned juvenile n-3 PUFA was also significantly higher than in control-bred juveniles. These findings illustrated that PUFA, especially the DHA, EPA and ARA, are of great absorption and utilization in gonadal development and juvenile growth of Chinese sturgeon. U.S.

The effect of fish and rapeseed oils on growth performance, egg fatty acid composition and offspring quality of sterlet sturgeon (Acipenser ruthenus)

“…Similar to that reported in other studies, the use and importance of DHA/EPA, DHA/ARA, EPA/ARA and n-3/n-6 ratios in the diet and egg lipids determine reproductive success and egg (Liang et al, 2014;Luo et al, 2015;Tong et al, 2017), and larval quality (Liu et al, 2014;Luo et al, 2015). Importantly, a significant higher value in the length and weight of the larval obtained from FO + VO treatment, and a significant higher value in GVM of broodstock receiving FO + VO diet compared to other treatments in the middle of sex maturity and compared to broodstock receiving FO diet at the end of sex maturity, which suggested a special need to FA for gonad development and subsequently for egg and embryogenesis in starlet.…”

“…We speculate that the selective enrichment capacity may be closely related to gene regulation (Wade, Van Der Kraak, Gerrits, & Ballantyne, ). Based on this internal regulation, fish primarily ensures that the nutrients in the eggs are sufficient and balanced (Liu et al, ) because, during fish ovarian development, the oocytes incorporate compounds essential for egg viability and larval survival (Rainuzzo, Reitan, & Olsen, ). Taken together, in this study, the significant difference in the GVM of the middle and late reproduction periods in different treatments in sterlet broodstock could be explained by selective catabolism of certain FA and/or selective transfer of other FA to the oocytes that proved sterlet GVM is affected by FA present in the diet.…”

“…The variability observed in storage of each lipid class may reflect their function during ovarian development (Johnson, 2009). Studies have shown that gonad maturity and egg quality are related to lipid storage, accumulation, and consumption (Liu et al, 2014;Liu, Li, Zhang, Guo, & Zhang, 2009;Luo et al, 2017).…”

“…In addition, the ratio of AL/ALA is 2:1 in rapeseed oil, which has been considered beneficial to human health (Ackman, 1990). However, studies on sturgeon have been limited to the effect of lipid and the ratio of FA n-3/n-6 on growth, FA composition in tissue, gonadal development, eggs and the quality of offspring (Liu, Li, Guo, & Gao, 2014;Luo et al, 2015;Song, Zhuang, Zhang, Zhang, & Liu, 2014;Zhou et al, 2017).…”

Microalgas como ingrediente e suplemento dietético para tilápia <i>Oreochromis niloticus</i>: valor biológico, desempenho e composição da carcaça

“…O enriquecimento de dietas para reprodutores com ácidos graxos poliinsaturados tem um potencial de aplicação comercial, pois há indícios que peixes utilizam as reservas de ácidos graxos de forma seletiva, priorizando a disponibilização dos poli-insaturados presente nos músculos, para a formação de gônadas e ovócitos, podendo influenciar também o desempenho reprodutivo e o desenvolvimento larval (Liu et al, 2014, Ng and Wang, 2011, Morais et al, 2014, Yanes-Roca et al, 2009. No entanto, ressalta-se a importância de mais estudos que avaliem essa influência em tilápia.…”