Editor choice

World Aquaculture Society | JWAS 52 Editor’s Choice Award (4)

Nutritional evaluation of the cricket, Gryllus bimaculatus, flour as a fish meal substitute for plaice, Paralichthys olivaceusjuveniles

Jeong, SM, Khosravi, S, Mauliasari, IR, Lee, BJ, You, SG, Lee, SM.

Olive flounder, Paralichthys olive, is one of the most cultivated flatfish species in the world. This marine species requires high levels of easily digestible protein, and current production methods still rely on the inclusion of large amounts of fishmeal or junk fish in formulated and freshly mixed diets, respectively. In the latest featured article from Seong-Mok Jeong and the co-authors studied the increased inclusion of cricket meals, Gryllus bimaculatus, to replace fishmeal in the diet of plaice. The results showed up to 40% fishmeal substitute without any reduction in growth. Antioxidant enzyme activity increased with inclusion of cricket meal up to 60%, but fatty acid profiles were affected by high inclusion levels. The results indicate that cricket meal is a readily available and viable protein source for the partial replacement of fishmeal from this valuable fish species.

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Evaluate zooplankton in traditional and split-pond systems for rearing golden minnows, Notemigonus crysoleucas.

Kaimal, S., & Kelly, AM

Golden glow, Notemigonus crysoleucas, are the most important baitfish species in US aquaculture. Kaimal and Kelly, in their latest study, compared divided pond systems and traditional earthen ponds to determine the effect of pond type on available zooplankton. Although it has been proposed that divided pond systems may provide refuges for zooplankton in the waste treatment unit, in fact traditional pond systems had significantly higher zooplankton densities. The most important impact on the performance parameters of the fish was found to be the lack of additional feeding in the divided pond systems, while the most important impact on survival remained the well-known external impacts. bird and snake depredation.

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Transgenic Camelina Oil is an effective source of eicosapentaenoic acid and docosahexaenoic acid in the feed of farmed rainbow trout, in terms of growth, tissue fatty acid content and sensory properties nets

Osmond, ATY, Arts, MT, Bazinet, RP, Napier, JA, Han, L., & Colombo, SM

Sustainable sources of long-chain omega-3 (n-3) polyunsaturated fatty acids (LCPFAs) are essential for the development and growth of fed aquaculture. Plant oils such as Camelina sativa, genetically engineered to produce eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), may offer an alternative to fish oil. Osmond et al. fed low (12.5 g / kg) and high (130 g / kg) transgenic Camelina sativa oil-based diets and a fish oil control diet for juvenile rainbow trout. The results clearly show that Camelina sativa the oil is nutritionally suitable for trout. All trout growth performance data were the same for all treatments, however the poor Camelina sativa the oil-based diet had a lower EPA content in the fillets. Stable isotope analysis confirmed the storage of DHA in tissues from different food sources. The top Camelina sativa the oil-based diet produced firmer and more intensely colored trout fillets.

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Characterization of Vibrio sp. strain AB15 and Pseudomonas fluorescens shrimp pond biofloc strain NB14 capable of high ammonia and nitrite removal efficiency

Dou, L., Chen, W., Pan, L. and Huang, F.

Isolation of the appropriate bacterial strains from the biofloc promises the possibility of finding probiotic strains useful for the removal of nitrogenous wastes. Dou et al. isolated and cultured two facultative anaerobic strains Vibrio sp. strain AB15 and Pseudomonas fluorescens strain NB14 from shrimp ponds and studied their efficiency in removing ammonia and nitrite. Under optimal conditions, the strains both removed over 90% of the two wastes. The isolates were harmless to shrimp and inhibited common pathogens Vibrio species at concentrations of 105-ten8CFU / mL. These strains have significant potential for use as probiotics in shrimp ponds to maintain biosecurity and water quality under high nitrogen loads.

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