Journal of Fisheries

Assessment of fish consumption behaviour and market forecasts for sustainable fisheries in Manipur, India

2025-12-18T17:52:13+00:00

This study analysed the socio-economic characteristics, consumption behaviour and expenditure patterns of fish-consuming households in Manipur, India, using data from 450 households across six districts belonging to different social background. Secondary data (2015 – 2025) obtained from government records supported a production-requirement forecast. The regression model demonstrated a moderately strong relationship between the predictors and the dependent variable (R² = 0.588; adjusted R² = 0.581). A paired t-test revealed that monthly expenditure on fish alone ₹5,326.88 (~59.20 $) was much higher than other non-vegetarian foods ₹2,310.44, comprising nearly 70% of the total non-vegetarian expenses. Holt’s exponential smoothing model (R² = 0.813, MAPE = 2.71%) projected that fish demand will exceed supply from 2024 – 2029, indicating a widening gap. The study concludes that fish holds cultural and nutritional importance in Manipur and calls for enhanced aquaculture, better market infrastructure, and improved consumer awareness for sustainable fish supply and food security.

Using brine shrimp to assess the performance of Annona muricata–zinc oxide nanoparticles: characterization and evaluation of photocatalytic, antibacterial and antibiofilm properties

2025-12-18T07:01:50+00:00

The development of multifunctional nanoparticles through green synthesis is an important advancement in nanotechnology, addressing the growing need for effective antimicrobial agents against drug-resistant pathogens and efficient photocatalysts for environmental remediation, while also necessitating thorough eco-toxicological assessments to ensure their safe application, particularly in sensitive ecosystems like fisheries. In this study, we investigated the antimicrobial activities, photocatalytic activity and eco-friendly assessment on zooplankton crustacean Artemia salina and phytochemical properties of biosynthesized zinc oxide nanoparticles using aqueous fruit extract of Annona muricata (Am-ZnO NPs). The synthesized Am-ZnO NPs was characterized using UV–visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). XRD analysis revealed the crystalline nature of Am-ZnO NPs. TEM analysis showed that the Am-ZnO NPs were spherical in shape with a size between 50 and 100 nm. In addition, Am-ZnO NPs showed antibacterial and antibiofilm activity against multiple drug resistance (MDR) Gram positive, Enterococcus faecalis bacteria. Am-ZnO NPs showed significant photocatalytic activity against two different organic dye pollutants namely methylene blue and acridine orange under both sunlight and UV light exposure. Ecotoxicity assessment of Am-ZnO NPs (25, 50, 75, and 100 μg mL^–1) showed no toxicity against non-targeted marine crustacean Artemia salina at low concentration and slightly toxic at high concentration (100 μg mL^–1). Together, the results suggest the potential application of Am-ZnO NPs against multiple drug resistance microbes and photocatalytic activities.

Investigation on the cypermethrin-induced genotoxic, biochemical, and antioxidant gene expression modulations in the gill tissue of Pethia conchonius, a resident fish of river Teesta, India

2025-12-18T07:02:03+00:00

Pesticides, an integral part of agricultural practices, contaminate aquatic bodies through surface runoff and leaching and threaten non-target organisms like fish. Synthetic pyrethroids, a widely used insecticide group have been shown to have detrimental effects on fish. Pethia conchonius, a non-target fish from river Teesta was used as a model organism to evaluate the detrimental effects of pyrethroid insecticide, cypermethrin on fish. The comet and micronucleus assays revealed cypermethrin-induced severe nuclear DNA damage showing three-fold decrease in % head DNA with a concomitant 70-fold increase in % tail DNA, and up to 21 times increase in MN frequency for SLC III at 96 hr exposure. The SOD, CAT, and GPx assays in gills and their mRNA expression analysis indicated down regulation of these anti-oxidant enzymes in a concentration and time-dependent response, with the lowest decrease being 4.2, 2.2, and 1.8-folds respectively for each of the enzymes at 96 hr of cypermethrin treatment in comparison to the control (p > 0.05). Subsequently, elevated levels of MDA in the gills of cypermethrin-treated P. conchonius further indicated increased oxidative stress and lipid peroxidation. Elevated oxidative stress and ROS levels can cause DNA damage and disrupt normal cell functioning, biochemical pathways, and cell cycle. The results indicated that cypermethrin is highly genotoxic and induces oxidative stress in the fish, supporting its hazardous effect on non-target organisms in aquatic ecosystems.

Growth and nutrient profile of Tetraselmis chuii under different urea concentrations: implications for sustainable uses

2025-12-18T07:02:17+00:00

Nitrogen is regarded as one of the most important nutrients for algal cells, having a direct impact on the growth and biochemical contents of microalgae. The goal of this research was to compare the growth and proximate components of Tetraselmis chuii cultivated in various urea concentrations as an available source of nitrogen. Results disclosed that T. chuii cultivated in urea at 93.4 mg L^–1 N had higher cell density, biomass, and optical density compared to 11.67 mg L^–1, 23.35 mg L^–1, 46.7 mg L^–1, and 233.5 mg L^–1 N, respectively. Protein content was highly significant for urea at 233.5 mg L^–1 N concentration compared to other concentrations. In contrast, higher carbohydrate content was found at 11.67 mg L^–1 N compared to other concentrations of urea. Thus, the current study found that raising or decreasing urea concentrations had a substantial effect on the growth and proximate composition of indigenous marine T. chuii, and the highest biomass was recorded at 0.0145 g L^–1 (dry biomass) from 93.4 mg L^–1 N. These findings have implications for the cultivation of microalgae for various applications, including biofuel production, wastewater treatment, mariculture developments, and a sustainable blue economy in Bangladesh.

Comparison between Indian spinach production in aquaponics utilizing fish wastewater and hydroponics biogas slurry solution

2025-12-18T07:02:30+00:00

The experiment compared Indian spinach production in aquaponics utilizing fish wastewater and hydroponics with biogas slurry solution. The aquaponics system involved 60 juvenile tilapias, released into a 750 L tank with an average initial length and weight of 14.41 ± 0.66 cm and 49.81 ± 4.29 g, respectively. The fish were fed commercial pelleted feed twice daily and maintained suitable water quality parameters, including pH, temperature, and DO, within the required range. The hydroponics system used biogas slurry as nutrient media. In each system, 3 plant beds were used, and 4 Indian spinach plants were planted in each bed. Physical parameters of water indicated that the aquaponics system had higher levels of EC, HCO₃, CO₃, Total-N, potassium, sulphur, and sodium than the hydroponics system. After 90 days, aquaponics had the largest plant weight (82.05 ± 23.31 g), with significantly higher levels of nitrogen, potassium, and sulphur content (by 5.54%, 3.10%, and 0.61% respectively) in leaves was found in aquaponics, while the phosphorus (0.85%) was higher in hydroponics. The yield of Indian spinach was higher in aquaponics (2.88 kg m^–2) than in hydroponics (1.52 kg m^–2). Length gain of experimental fish in aquaponics was 10.54 ± 1.51 cm, weight gain 112.71 ± 21.75 g, with a percent weight gain of 227.23 ± 42.98, specific growth rate of 1.4 ± 0.16% day^–1, which was normal. The study concluded that wastes from tilapia aquaponics are more suitable for Indian spinach cultivation than low-cost biogas slurry hydroponics.