Effects of dietary arachidonic acid on final maturation, spawning and composition of gonad of black sea urchin Diadema setosum (Leske, 1778)

Abstract

This study investigated the effect of dietary arachidonic acid (ARA, 20:4n‐6) on final maturation, spawning performance and composition of the gonad of black sea urchin (Diadema setosum). Four different dietary ARA levels of 0.3 g/kg (Control diet), 1.4 g/kg (ARA 1.4), 2.5 g/kg (ARA 2.5) and 3.7 g/kg (ARA 3.7) were prepared and tested in this feeding trial for 90 days. The result showed that growth in terms of weight was not relatively affected by dietary ARA. Gonadosomatic Index (GSI) of animals were gradually increased in all the diets throughout the trial. The highest GSI level (25.7 ± 3.16%) was observed in animals fed with the diet ARA 1.4. ARA content in the gonad proportionally increased with dietary ARA levels. The highest larval survival rate (85.5 ± 5.67%) was found in diet ARA 2.5. The results of this study indicate that ARA plays an important role in the reproduction functions of black sea urchin and supplementing an appropriate level of ARA in the broodstock diet could induce the final maturation and improve reproduction of black sea urchin, but a higher level of ARA (3.7 g/kg) seems to have a negative effect on both growth rate and GSI.

Effects of dietary arachidonic acid on reproduction performance, tissue fatty acid profile and gonadal steroidogenesis in female yellow catfish Pelteobagrus fulvidraco

“…In this study, observation of ovary tissue sections showed that the follicular cells in the ARA supplemental groups had significantly shed, thickened zona radiatae compared with the control group, indicating that ARA supplemental dietary promoted gonad maturity and accelerated oocytes transformation from stage IV to stage V (Selman et al, 1993). Similar results were observed in blue gourami ( Trichopodus trichopterus ) (Masoudi Asil et al, 2017) and black sea urchin ( Diadema setosum ) (Nhan et al, 2020).…”

Dietary fatty acid profiles shape crayfish biosynthesis and performance: Implications for riverine food webs

“…(2020) who reported that marine crabs modified dietary FAs in a similar way for each of their distinct experimental diets (suggesting a consistent strategy for lipid metabolism), we found that freshwater crayfish fed high‐quality pellets were selectively enriched in only four FAs; two long‐chain polyunsaturated FAs 20:4ω6 (ARA) and 20:5ω3 (EPA), and two monounsaturated FAs 18:1ω9 (OA) and 16:1ω7 (POA), suggesting that proportion of these molecules may be particularly important for their somatic growth. Proportion of ARA and EPA in tissues of other aquatic animals have been associated with increased growth and survival (e.g., Li et al., 2020; Nhan et al., 2020), and as discussed previously, monounsaturated FAs, such as POA and OA, are known to be important energy sources for fish (Tocher, 2003) and have been associated with ontogenetic changes to metabolism to maximise growth or for periods of fasting (Chaguaceda et al., 2020).…”

Effects of lipid sources on the growth performance, gonad development, fatty acid profile and transcription of related genes in juvenile sea urchin ( Strongylocentrotus intermedius )

“…The roe (gonads) of sea urchins have been considered as a delicacy in many parts of the world, especially in Asia and Europe (Lawrence, 2007). In the last decades, the rapidly increasing market demand for sea urchin roe has resulted in the over‐fishing of the wild stocks worldwide (Brundu et al., 2017; Nhan et al., 2020; Zhang, Cui, & Li, 2019). As an alternative to wild fisheries, aquaculture of sea urchins has been proven to be practical especially with the fast improvement in the stock enhancement and farming technologies (Gibbs, Watts, Lawrence, & Lawrence, 2009; Hammer et al., 2012; Watts, Lawrence, & Lawrence, 2013).…”