18 MARCH 2025 • WORLD AQUACULTURE • WWW.WAS.ORG • Kumar, G., Hegde, S., van Senten, J., Engle, C., Boldt, N., Parker, M., Quagrainie, K., Posadas, B., Asche, F., Dey, M., Aarattuthodi, S., Roy, L. A., Grice, R., Fong, Q., & Schwarz, M. (2024). Economic contribution of U.S. aquaculture farms. Journal of the World Aquaculture Society, 55(6), e13091. https://doi.org/10.1111/jwas.13091 In this paper, the authors completed an extensive study based on primary, farm-level data to assess the economic contribution and impact of aquaculture in the U.S. The authors determined that U.S. commercial aquaculture supported 22,000 jobs and contributed $4 billion annually to the economy. They also estimate that the total economic impact would be three to four times higher if aquaculture products are followed through downstream marketing channels. What is critical in this work is the clear relationship of aquaculture businesses to other economic sectors that support this industry, and the realization of how regulatory and other policies can have a profound effect on local, regional, and national economies. They were able to show that the greatest economic contribution came from foodfish farms followed by mollusk farms. Interestingly, the freshwater farming sector contributed more than twice that of marine aquaculture, and they suggest that regulatory barriers pose the greatest limitation to aquaculture growth in the U.S. This has been especially true for marine aquaculture, especially marine finfish in offshore and coastal areas, where clear permitting processes need to be developed and streamlined. In conclusion, the authors highlight that U.S. aquatic resources would support substantial aquaculture growth in both the freshwater and marine sectors. • Spada, N. N., Fairchild, E. A., & Trushenski, J. T. (2024). Tolerance of juvenile lumpfish (Cyclopterus Lumpus) to high rearing densities. Journal of the World Aquaculture Society, 55(6), e13089. https://doi.org/10.1111/jwas.13089 This applied research study provides a foundation for understanding how density impacts the culture of lumpfish (Cyclopterus lumpus), which are reared primarily as cleaner fish for sea lice control on Atlantic salmon (Salmo salar). Challenges for the intensive rearing of this species have been noted and include behavioral characteristics such as excessing fin nipping and aggression between juvenile conspecifics. The authors of this paper take a deeper look at density-dependent interactions during the culture of this species. In this study, they tested four rearing densities (40, 60, 70, and 90g/L) for two size classes of juvenile lumpfish (2- and 13-g) over an 8 week study period. Growth, survival, and fish aggression were assessed. For 2-g fish, it was found that mean weight gain ranged from 170% to 307%, and specific growth rates ranged and 1.77% to 2.50%. For 13-g fish, weight gain and specific growth rate ranged from 286% to 471% and 2.42% to 3.10%, respectively. It was found that lower density rearing resulted in more rapid growth for lumpfish, and although aggression only occurred in larger lumpfish at the higher fish densities, there was no mortality in any treatments. This study provides baseline fish culture criteria and recommendations for juvenile lumpfish rearing density. The authors suggest that a broad range of densities could be targeted without affecting lumpfish welfare. Although facility-specific decisions will be based on the operational plans and needs of the salmon farms targeted for sea lice control, results from this work provide valuable information for hatchery managers related to fish growth and aggression. Table of Contents 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 Ahmad, I., Irm, M., Ahmed, I., Haoran, Y., Taj, S., Bhat, T. A., Khan, S. K., Puswal, S. M., Khalil, H. S., Sopjani, M., Peres, H., Faggio, C., Rather, M. A., & Amin, A. (2024). Role of ginger in fish nutrition with special emphasis on growth, health, gut and liver morphology. Journal of the World Aquaculture Society, 55(6), e13101. https://doi.org/10.1111/jwas.13101 Applied Research * Kumar, G., Hegde, S., van Senten, J., Engle, C., Boldt, N., Parker, M., Quagrainie, K., Posadas, B., Asche, F., Dey, M., Aarattuthodi, S., Roy, L. A., Grice, R., Fong, Q., & Schwarz, M. (2024). Economic contribution of U.S. aquaculture farms. Journal of the World Aquaculture Society, 55(6), e13091. https://doi.org/10.1111/jwas.13091 Sealey, W. M., & Gaylord, T. G. (2024). Determination of the protein value of novel poultry meal ingredients for rainbow trout, Oncorhynchus mykiss. Journal of the World Aquaculture Society, 55(6), e13098. https://doi.org/10.1111/jwas.13098 Kaiser, F., Schlachter, M., van der Sande, A. D., & Schulz, C. (2024). A taste for growth: Rapeseed lecithin improves the feed intake of post-juvenile rainbow trout (Oncorhynchus mykiss). Journal of the World Aquaculture Society, 55(6), e13097. https://doi.org/10.1111/jwas.13097 * Spada, N. N., Fairchild, E. A., & Trushenski, J. T. (2024). Tolerance of juvenile lumpfish (Cyclopterus Lumpus) to high rearing densities. Journal of the World Aquaculture Society, 55(6), e13089. https://doi.org/10.1111/jwas.13089 Original/Fundamental Research Ott, B. D., Torrans, E. L., & Tucker, C. S. (2024). Fish production, water quality, and the role of nitrification as an ammonia removal process in intensively aerated hybrid catfish ponds. Journal of the World Aquaculture Society, 55(6), e13094. https://doi.org/10.1111/jwas.13094 Bosworth, B. G., Chisolm, D. O., Patterson, M. J., & Ott, B. D. (2024). Relationships between weight loss during short-term feed deprivation, feed conversion efficiency, and growth in Delta Select and Delta Control line channel catfish families. Journal of the World Aquaculture Society, 55(6), e13072. https://doi.org/10.1111/jwas.13072 the Journal of the World Aquaculture Society Editor’s Choice Awards 55(6)
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