Differences in fatty acid composition of egg capsules from broodstock spotted babylon, Babylonia areolata, fed a local trash fish and formulated diet under hatchery conditions

Abstract

This study is the first attempt to condition broodstock Babylonia areolata using formulated diets under hatchery conditions. Samples of spotted babylon egg capsules from broodstock fed either a formulated diet or a local trash fish, carangid fish (Seleroides leptolepis) for 120 days were analyzed for proximate composition and fatty acid composition. The formulated diet contained significantly higher levels of arachidonic acid (20:4n -6; ARA), eicosapentaenoic acid (20:5n -3; EPA) and docosahexaenoic acid (22:6n -3; DHA) than those of the local trash fish. The formulated diet also had significantly higher ratios of DHA/EPA and (n -3)/(n -6) PUFA than those of local trash fish but not for the ARA/EPA ratio. The compositions of egg capsules produced from broodstock fed formulated diet contained significantly more ARA, EPA and DHA compared to broodstock fed the local trash fish. The ARA/EPA and DHA/EPA ratios in egg capsules were significantly higher in the trash fish-fed group compared to those fed the formulated diet. However, (n -3)/ (n -6) PUFA ratios in egg capsules produced from broodstock fed the formulated diet did not differ significantly compared to those from broodstock fed the local trash fish. The relatively low DHA/EPA, ARA/EPA and (n -3)/(n -6) ratios in the egg capsules produced from the formulated diet-fed broodstock B. areolata suggested that this diet is inferior, when compared to the traditional food of trash fish.

Advancing spotted babylon broodstock performance and sustainable aquaculture practices through natural and formulated feeds

“…Survival metrics: Our research on the B. areolata's survival adaptability across different diets revealed consistent survival rates regardless of dietary variations (P>0.05), as detailed in Table 8. These results align with Chaitanawisuti et al (2011), who also found steady survival rates for snails in varied environments, such as canvas and earthen ponds.…”

“…Cross-comparison with previous research: The weight augmentation of the T1 cohort was congruent with the findings of Chaitanawisuti et al (2011), who reported analogous weight gain trajectories in juvenile snails, both in canvas and earthen ponds. Furthermore, Dobson et al (2020) showcased a comparable weight progression in snails nurtured on trash fish, observing a weight transition from 0.90 ± 0.38 g to 4.93 ± 1.44 g over a 92-day period.…”

“…Given the increasing industrial significance of this species in Thailand, the objective is to consistently yield a substantial number of highquality eggs and larvae. Notably, considerable inconsistencies in spawning events, hatchability, and survival rates of larvae and juveniles of spotted babylon occur during the same season, even between different batches and hatcheries (Chaitanawisuti et al, 2011). This inconsistency prevails despite efforts to standardize the rearing conditions, such as managing larval density, controlling water quality, and employing specific microalgal species for feeding.…”

“…This inconsistency prevails despite efforts to standardize the rearing conditions, such as managing larval density, controlling water quality, and employing specific microalgal species for feeding. Unfortunately, as demonstrated by Chaitanawisuti and Kritsanapuntu (1997), the results remain unpredictable with larvae quality fluctuating significantly.…”