14 SEPTEMBER 2024 • WORLD AQUACULTURE • WWW.WAS.ORG • Bo, Z., Peng, S., Qian, Y., Peng, R., & Jiang, X. (2024). The effects of different ratios of mixed feeding of Scenedesmus dimorphus to Cyclotella sp. on the growth performance, pearl production ability, and biochemical components of the new shell tissue of Hyriopsis cumingii. Journal of the World Aquaculture Society, 55(3), e13032. Available at: https://doi.org/10.1111/jwas.13032 China is the largest producer of cultured pearls with freshwater pearls accounting for over 95% of this production. This study determined the effects of feeding different ratios of two algae strains (Scenedesmus dimorphus and Cyclotella sp.) on the freshwater mussel Hyriopsis cumingii. The authors compared growth, pearl production ability, and various shell tissue properties following feeding. It was found that mixed feeding at different densities resulted in significant changes in growth, bead production quality, trace elements, and the composition of amino acids in newly formed shell tissue. Furthermore, body weight and shell growth rate were elevated when feeding 30 x 105 cells/ml of S. dimorphus and 8 x 105 cells/ml of Cyclotella sp. Pearl weight gain, amino acid ratio, and Ca2+ and Mn2+ were highest when feeding 16×105 cell/ mL of Cyclotella sp, but this finding was similar to the above treatment. Therefore, it was concluded that the optimal ratio for intensive culture of H. cumingii is to provide a mixed feeding of S. dimorphus (30 × 105 cell/ml) and Cyclotella sp. (8 × 105 cell/ml). This is one of the first reports on the effects of feeding different ratios of microalgae on pearl production and growth of H. cumingii. • Dou, Y., & Bi, X. (2024). Effects of dietary supplementation with Haematococcus pluvialis on the growth, antioxidantase activities, and gut microbiota of Chinese mitten crab (Eriocheir sinensis). Journal of the World Aquaculture Society, 55(3), e13060. Available at: https://doi.org/10.1111/jwas.13060 Extensive culture and breeding of the Chinese mitten crab (Eriocheir sinensis) occur in Northern and Eastern China; however, frequent disease and germplasm degradation have impacted sustainable aquaculture development of this species. The effect of supplementing crustacean feed with the unicellular algae Haematococcus pluviali was determined in this study. The authors explored growth, antioxidantase activity, and gut microbiota changes in this species following supplementation with 5% H. pluvialis powder. It was found that groups of crabs fed H. pluvialis powder had significantly improved weight gain and specific growth rate (p<0.05) following 14 days of feeding. Superoxide dismutase (SOD) and catalase (CAT) were found to decline, while the activity of phenoloxidase (PO) rose following treatment with H. pluvialis powder. Alkaline phosphatase (AKP) activity initially decreased then increased. The authors found that there were significant changes in dominant bacterial phyla in the gut with the relative abundance of Firmicutes and Candidatus_Bacilloplasma being higher in treated crabs. Taken as a whole, this study recommended that supplementation with 5% H. pluvialis powder may provide rapid fattening and potentially improve immunity and metabolic capacity of E. sinensis. Table of Contents Journal of the World Aquaculture Society 55(3) Your society journal JWAS is fully available to you including all back issues at https://onlinelibrary.wiley.com/journal/17497345 or at www.was.org (just click on the photo of JWAS). Review Papers Stone, N. M., Engle, C. R., Kumar, G., Li, M. H., Hegde, S., Roy, L. A., Kelly, A. M., Dorman, L., & Recsetar, M. S. (2024). Factors affecting feed conversion ratios in US commercial catfish production ponds. Journal of the World Aquaculture Society, 55(3), e13053. https://doi.org/10.1111/jwas.13053 Applied Research Van Nguyen, N., Hao, P. N., Hai, P. D., & Hung, L. T. (2024). Improved growth, body composition, and fatty acid composition in striped catfish juveniles, Pangasianodon hypophthalmus, fed with diets containing different oil sources. Journal of the World Aquaculture Society, 55(3), e13064. https://doi.org/10.1111/ jwas.13064 Cabanillas-Gámez, M., Gomez-Cadena, J., Galaviz, M. A., de Oca, G.-M., Figueroa-Saavedra, F., Lopez, L. M., Trejo-Escamilla, I., Barreto-Curiel, F., & Lopez-Valencia, G. (2024). Use of fermented malted barley by-product as partial feed replacement and carbon source for rearing Nile tilapia (Oreochromis niloticus) juveniles. Journal of the World Aquaculture Society, 55(3), e13062. https://doi.org/10.1111/jwas.13062 Chainark, S., Chainark, P., & Soonsan, P. (2024). Differences in shrimp pond bottom soil properties and bacterial load between acute hepatopancreatic necrosis disease (AHPND)-infected ponds and AHPND-free ponds and their relation to AHPND. Journal of the World Aquaculture Society, 55(3), e13071. https:// doi.org/10.1111/jwas.13071 Original/Fundamental Research Wang, Z., Chen, X., Shi, L., Zhang, X., & Hu, Y. (2024). Productivity versus environmental sustainability: A broadscale assessment of freshwater aquaculture’s technical efficiency and ecological efficiency in China’s inland provinces. Journal of the World Aquaculture Society, 55(3), e13057. https://doi.org/10.1111/ jwas.13057 Olagunju, O. F., Kristofersson, D., Tomasson, T., & Kristjánsson, T. (2024). Farm strategies and characteristics influencing profitability in Nigerian catfish aquaculture: Lessons on resilience during economic crisis and COVID-type shock. Journal of the World Aquaculture Society, 55(3), e13058. https://doi.org/10.1111/ jwas.13058 the Journal of the World Aquaculture Society Editor’s Choice Awards 55(3)
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