Journal of The World Aquaculture Society最新文献

The goals of this research were to resolve the problems of low quantity and poor quality of eggs in cuttlefish aquaculture, and to provide empirical support for the development of formulated feeds. The impacts of different feeds on the quantity and quality of eggs laid by cuttlefish (Sepia pharaonis) were studied using three different species: Litopenaeus vannamei, Nibea albiflora, and Sillago sihama. We explored the influence of dietary composition on the quantity and quality of eggs laid. The results showed that the quantity and quality of eggs laid were significantly affected by the feed species. Compared with the feed of S. sihama and N. albiflora, the feed of L. vannamei increased the number of eggs laid by17.45% and 24.15%, the egg width by 5.05% and 5.91%, the hatching rate by 5.42% and 12.59%, and the weight of newly hatched cuttlefish by 5.05% and 5.98%, and there was no significant difference in the incubation period. The quantity and the quality (the egg width, incubation period, hatching rate, and weight of newly hatched cuttlefish) were significantly positively correlated with protein content, C18:1(n-9), C18:2, C18:3, C20:2, C20:3, arachidonic acids (AAs), eicosapentaenoic acids (EPAs), and docosahexaenoic acid (DHA) of feed. These results demonstrate that L. vannamei is the optimal feed for broodstock cuttlefish during the breeding period, and that diets rich in protein and n-3 highly unsaturated fatty acids (HUFA) can enhance their reproductive performance.

A study conducted at the University of North Carolina Wilmington examined the growth of hatchery-raised black sea bass (BSB), Centropristis striata, juveniles using recirculating aquaculture systems (RAS) technologies. Regression analysis was used to establish the relationship between fish weight and age. Subsequent growth curves were derived for hypothetical genetic generations (F1 and F2) assuming a 12.5% weight increase per generation. A model of a commercial-scale RAS facility was developed to optimize stocking, tank transfer, and harvesting schedules for each generation. The study compared biomass, harvest frequency, annual yield, and tank space efficiency (TSE) under various scenarios. Results showed that a four-stage production plan model consisting of three tanks during the final growout stage was most effective to produce F0 generation fish, yielding 35,389 lbs (16,052 kg) per cohort, 6.02 harvests, and 220,035 lbs (99,806 kg) total biomass annually, with a TSE of 89.29%. For F1 and F2 generations, similar production plan models resulted in increased biomass and TSE. Selective breeding led to an 11.8% increase in annual biomass yield for F1 fish and an additional 9.2% for F2 due to shorter inter-harvest intervals and higher TSE. Iterative testing of stocking and harvesting strategies was determined to be crucial for optimizing harvest quantity and timing in RAS BSB growout facilities.

The present study investigated the effects of replacing low-temperature fishmeal (LT FM) with graded levels of partly deshelled Antarctic krill (Euphausia superba) meal and pea protein concentrate (PDKM + PPC), PDKM alone, or whole krill meal with shells (WKM) as primary protein sources on feed pellet physical quality and sinking velocity (S_v) under varying water temperatures and salinities. Seven experimental diets were formulated and tested for S_v (at water salinities of 20‰ and 34‰ and temperatures of 4, 12, and 20°C), along with pellet length, diameter, bulk density (BD), unit density (UD), apparent porosity (AP), and Ligno pellet durability index (PDI) at four testing times (30, 60, 90, and 120 s). S_v ranged from 8.1 to 12.4 × 10⁻² ms⁻¹across all test conditions and increased curvilinearly with PDKM + PPC inclusion, but significantly (p < 0.001) decreased when PDKM or WKM fully replaced LT FM. Lower salinity and higher water temperature increased S_v; across all diets and water temperatures, S_v was 4.2% higher at 20‰ salinity than at 34‰ salinity and increased by 0.52% per 1°C rise in water temperature. While pellet diameter decreased significantly (p < 0.001) with increasing PDKM + PPC, pellet length was largely unaffected. BD ranged from 561 ± 4 to 674 ± 5 kg m⁻³, UD from 899 ± 9 to 1039 ± 15 kg m⁻³, and PDI from 81.6% to 96.2%, with PDKM + PPC diets showing higher densities and better durability. S_v correlated significantly (p < 0.001) with UD (r = 0.811), BD (r = 0.817), and PDI (r = 0.918). Based on physical pellet quality results, diets containing a mixture of PDKM + PPC can be used up to 487 g kg⁻¹ to produce a pellet with a S_v of 11.6 × 10⁻² ms⁻¹ irrespective of water salinity or water temperature.

The ability of high-value plant protein concentrates to replace fish meal and other expensive animal proteins in diets for rainbow trout depends on their available nutrient composition, cost and consistency. The aim of this study was to assess the effects of two novel corn protein products (ANDVantage™ 40Y and ANDVantage™ 50Y, The Andersons, Inc.) on the growth performance of juvenile rainbow trout. Two parallel replacement series were applied with test products included at 0%, 7.5%, 15%, 22.5%, and 30% diet dry weight replacing dietary fish meal and poultry meal on a digestible protein (DP) basis. All diets were formulated to 42% DP and 18% crude lipid, supplemented with Lys, Met, and Thr to targets of 3.8%, 1.3%, and 2.1%, respectively, and manufactured by cooking extrusion. Diets were randomly assigned to triplicate tanks of rainbow trout (Oncorhynchus mykiss, Troutlodge Inc., Sumner, WA) with a mean initial weight of 38 ± 0.7 g (mean ± SD). Fish were cultured in poly tanks (320 L) at n = 20 fish per tank in a recirculating system with a flow rate of 4–6 L min⁻¹, temperature at 15°C, and a 13:11 light:dark cycle, and fed twice daily to apparent satiation 6 days per week for 12 weeks. Including ANDVantage products at levels above 22.5% decreased growth (gram gain per fish, p < 0.0001). A significant interaction was observed for feed conversion ratio (FCR; p < 0.0001) wherein fish fed ANDVantage™ 40Y had significantly higher FCR than fish fed ANDVantage™ 50Y when fed levels above 22.5%. Optimized inclusion levels, determined by regression analysis for combined data or for each ingredient when interactive effects occurred, indicate that maximum inclusion levels for ANDVantage™ 40Y and ANDVantage™ 50Y in rainbow trout diets range from 13.5% to 21.5% depending on the performance variable assessed.

The aquaculture of Argopecten purpuratus (Peruvian scallop) is a profitable activity with positive impacts on the local economy. However, the development of biofouling on the culture lantern nets generates negative environmental impacts that affect its sustainability. A feasible option aimed at reducing the development of biofouling is to increase the frequency of lantern nets exchange. In this study, we tested whether doubling the lantern net exchange frequency in the final phase of culture reduces biofouling and, in turn, improves the growth and survival of A. purpuratus. For this purpose, in the concession of a company dedicated to the cultivation of A. purpuratus in Samanco Bay, Peru, four 10-floor lantern nets were placed at 25 organisms per floor, divided into two treatments (T1 and T2) with two replicates. One group of these (T1) was exchanged after 30 days, and another group (T2) was maintained until harvest. As a result of the lantern nets exchange, biofouling weight was reduced by 64.6%, survival improved by 10.8%, gonad weight increased by 52.5%, and adductor muscle weight increased by 62.4%, which represents an additional net income of 6582.58 US$ per ha. This study demonstrates the significant benefits of regular lantern net exchanges in mitigating biofouling and enhancing the overall yield and economic viability of A. purpuratus culture, contributing to the advancement of more sustainable aquaculture practices.

This study aimed to investigate the effects of stickwater (SW) on growth performance, digestibility, and intestinal structure in great sturgeon (Huso huso) larvae. A total of 1440 sturgeon larvae were selected and randomly assigned to 12 tanks (four treatments with three replicates each). The larvae were fed experimental diets containing 0% (SW0), 0.5% (SW0.5), 1.5% (SW1.5), and 2.5% (SW2.5) SW. No significant differences were observed in final weight, weight gain, or protein efficiency ratio among treatments (p > 0.05). However, a significant difference was found in specific growth rate (SGR) and feed conversion ratio (FCR) among treatments (p < 0.05), with SGR showing a positive linear relationship with SW content in the diets. There was no significant difference in feed intake (FI) among treatments (p > 0.05). The highest fillet fat content was recorded in the SW0 group, which was significantly different from the other treatments (p < 0.05). The highest trypsin activities were found in the SW2.5 group (p < 0.05). Lipase activity was higher in SW-containing diets compared with the control group (SW0) (p < 0.05). The highest feed consumption rate within short periods (10–30 min) was measured in the SW0.5 group, which was significantly different from SW0 (p < 0.05). The highest protein digestibility was observed in the SW2.5 group (p > 0.05), while fat digestibility was higher in the SW-containing diet groups than in the control group (p < 0.05). The maximum length of intestinal villi and muscle thickness were measured in the fish fed the 1.5% SW diet, which showed a significant difference compared with the SW0 group (p < 0.05). According to the results of the polynomial regression analysis, the 1.5% stickwater level led to the best growth performance. Overall, the inclusion of 0.5% to 1.5% stickwater in the diets of great sturgeon larvae enhanced feed attractiveness, improved growth performance, and increased digestibility.

Zahran, E., Wang, B., Amoah, K., Elbahnaswy, S., Ahmed, F., Farid, O. A.-H. A., Risha, E., Eldesoqui, M., El Sebaei, M. G., Hossain, F. M. A., & Abdel-Hafez, L. J. M. (2025). Dietary selenium nanoparticles (SeNPs) mediate intestinal microbiome and microbiota-derived metabolites regulating the growth and immunity of Nile tilapia. Journal of the World Aquaculture Society, 56(2), e70019. https://doi.org/10.1111/jwas.70019

Table 1 was reused in our paper; however, when this table was included, we missed the citation of our earlier publication, Zahran et al. (2024). Dietary microalgal-fabricated selenium nanoparticles improve Nile tilapia biochemical indices, immune-related gene expression, and intestinal immunity. BMC Veterinary Research, 20(1), 107. https://doi.org/10.1186/s12917-024-03966-4.

We apologize for this error.

This study analyzes the effect of density on growth and feeding rate in Hediste diversicolor. In a first trial, specimens ranging in size from 10 to 500 mg were fed for 15 days at apparent satiety at eight stocking densities ranging from 500 to 16,000 individuals m⁻². In a second trial, the effect of four manageable density levels ranging from 355 to 2471 ind m⁻² and three temperatures (14°C, 18°C and 22°C) on the feeding rate was studied, considering the same range of individual sizes. Using multiple regression analysis, equations were obtained to estimate growth, feed intake, and feed efficiency as a function of the variables studied. In addition, a third trial was conducted to investigate the spatial size distribution in culture tanks randomly seeded with juveniles at high densities. Density and body weight were inversely related to growth, feed intake, and feed efficiency, and temperature was directly related to feed intake but inversely to feed efficiency. Mean individual weight and biomass tend to be higher in the central area of the tanks, with a higher density of small individuals toward the periphery. Simulations performed with the equations obtained under different scenarios of real production show that managing density allows significant performance enhancement.

The purpose of this study was to investigate the nutrient uptake characteristics, osmotic adjustment abilities, and photosynthetic efficiency of floating-type U. prolifera (UP-FL), fixed-type U. prolifera (UP-FIX), and U. linza (UL) under varying salinity conditions. Our results demonstrated that UP-FL exhibited the broadest salinity tolerance, with significantly higher relative growth rates (RGR), photosynthetic efficiency, and osmotic adjustment ability (OAA) compared to UP-FIX and UL. The increased concentrations of potassium ions (K⁺) and proline (PRO) in UP-FL under high salinity were identified as key factors contributing to its superior salt tolerance. In contrast, U. linza showed lower RGR, photosynthetic efficiency, and OAA, indicating reduced adaptability to high salinity environments. The study also revealed that both UP-FL and UL respond to salinity stress by accumulating organic solutes such as soluble sugars (SS) and free amino acids (FAAs), which are crucial for osmotic adjustment. These findings highlight the potential of UP-FL for sustainable cultivation in diverse marine environments. Future research should focus on applying these physiological insights to optimize U. linza cultivation strategies, thereby enhancing yield and quality in commercial settings.

Ha, P. T. H., Thi, Q. V. C., Thuy, N. P., & Luan N. T. (2023). Multi-antibiotics resistance phenotype of pathogenic Vibrio parahaemolyticus isolated from acute hepatopancreatic necrosis disease in Litopenaeus vannamei farmed in the Mekong Delta. Journal of the World Aquaculture Society, 54(4), 1070–1087. 10.1111/jwas.12945

The Vietnam map used in Figure 1 of the published article was incorrect. The corrected figure is shown below.