Asian Journal of Fisheries and Aquatic Research
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1022 research outputs found
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Chemical Composition and Storage Stability of Flying Fish (Cheilopogon abeir) Embutido from Maitum, Sarangani Province under Chilled and Frozen Conditions
No full textThis study was conducted to determine the effect of different storage conditions (chilled and frozen) in the quality, acceptability, and shelf life of flying fish embutido. Lipid oxidation was analyzed by Peroxide Value (PV) determination on Days 0, 20, 40, and 60. On the same intervals, changes in organoleptic properties, particularly color, odor, flavor, and texture, were also determined using a Descriptive Sensory Score Sheet. General acceptability was likewise assessed using a 9-point hedonic scale. All samples in Day 0 and Day 20 did not exceed the USFDA standard for peroxide value which is 7.8 meq/kg. Progressive oxidation took place afterwards, leading to peroxide values that exceeded the acceptable limits for safe human consumption. All treatments exhibited an increase in PV and had a final peroxide value of 25.0 meq/kg for Treatment I (Chilled) and 16.5 meq/kg for Treatment II (Frozen) at Day 60. This indicated that slower oxidation occurs in frozen samples than those stored in chilled condition. Sensory evaluation revealed that among treatments, frozen flying fish embutido retained better organoleptic properties, which was consistently observed during the 60-day study
Chemical Composition and Storage Stability of Dolphinfish (Coryphaena spp.) Siomai from Kiamba, Sarangani Province under Chilled and Frozen Conditions
No full textThe increasing demand for value-added fish products has led to the exploration of alternative preservation methods to extend shelf life and maintain quality. Temperature is one of the primary factors in controlling the spoilage in fish because it has a direct effect on the growth of microorganisms. Thus, this study evaluates the acceptability and nutritional value of dolphinfish (Coryphaena hippurus) siomai stored under chilled (0–5°C) and frozen (-18°C) conditions over 45 days. The proximate composition analysis determined the moisture, fat, protein, and ash content of the product. Lipid oxidation was assessed using peroxide value (PV) analysis at intervals of 0, 20, and 40 days. Sensory evaluation was conducted by a panel of 10 participants using a hedonic scale to assess appearance, odor, texture, flavor, and general acceptability. Results indicated that frozen storage significantly reduced lipid oxidation, with lower PV levels compared to chilled samples. Peroxide values in chilled samples exceeded the acceptable limit (5.0 meq/kg) by Day 40, whereas frozen samples remained within safe thresholds. Sensory evaluation showed no significant differences (p > 0.05) in appearance, texture, and flavor between storage treatments, with both conditions maintaining acceptable quality until Day 45. However, chilled samples showed higher susceptibility to oxidation and spoilage. This study confirms that frozen storage effectively slows lipid oxidation, prolonging the shelf life and maintaining the sensory attributes of dolphinfish siomai. Further research is recommended to optimize packaging and freezing techniques for improved preservation
Histopathology, Haematology and Carcass Quality of Clarias Gariepinus (Burchell, 1822) Post-fingerling Fed Fresh and Dried Housefly (Muca domestica) Maggot
No full textThis study evaluates the histopathology, hematology, and carcass quality of C. gariepinus post-fingerlings fed fresh and dried housefly maggots, addressing the increasing demand for quality, affordable feed in aquaculture. Conducted at the Fisheries Department, Nnamdi Azikiwe University, Awka, Nigeria, the experiment involved 90 C. gariepinus divided into three groups: one fed fresh housefly maggots, another dried maggots, and a control group on commercial feed. Proximate analysis showed that dry maggot meal had 28.80% protein, 17.90% fat, and 23.90% carbohydrates. The control group had the highest total length, weight, liver weight, and fillet weight (p<0.05). However, fish on dry maggot feed showed the highest villi width and goblet cell number in the intestine, indicating better nutrient absorption. Haematological parameters, such as hemoglobin, red blood cells, and white blood cells, were highest in fish fed dried maggot meal, suggesting improved health status. Fish fed with maggot meal also showed higher enzyme activities (catalase and glutathione S-transferase), while histopathological examination revealed mild liver vacuolation and congestion in fish fed with fresh maggots. Overall, the study concludes that dried housefly maggot meal is a promising alternative to fishmeal due to its positive effects on growth, haematological indices, and intestinal morphology. The study recommends further investigation into anti-nutritional factors, optimization of feed formulations, scaling up production, and assessing the safety of maggot meal for other species
The Effect of Different Potassium Concentrations on the Growth Rate of Sea Grapes (Caulerpa lentillifera)
No full textSeaweed is a food commodity that has the potential to become various healthy food diversifications. Seaweed has various species, one of which is Caulerpa lentillifera. This study aims to analyze the effect of potassium concentration on the growth rate content in seaweed (Caulerpa lentillifera). The research method used was a completely randomized design (CRD) consisting of four treatments and three replications. The treatments used with different doses, namely A (0 ppm), B (1.5 ppm), C (3 ppm), D (4.5 ppm) with three replications. Seaweed C. lentillifera was maintained for 15 days using a 35 cm container media with a water volume of 10 liters. The parameters observed were specific growth rate, chlorophyll content, biomass residue, biomass decline rate and water quality. The results showed that the specific growth rate (SGR) ranged from 3.8-5.2%, the biomass decline rate ranged from 4.0-9.6%, biomass residue ranged30.67-66.76%,chlorophyll content ranged from 19.89-30.87 mg/L, and the results of water quality checks were classified as optimal. The results of the research analysis showed that the concentration of potassium fertilizer doses had a significant effect (p<0.05) on the rate of biomass and biomass residue decline so that further testing could be carried out. Meanwhile, the results of the research analysis showed that the concentration of potassium fertilizer doses did not have a significant effect (p>0.05) on the specific growth rate so that further testing could not be carried out
Occupational Health Risks and Hygiene Practices among Fish Retailers in Noakhali, Bangladesh: A Market-based Study
No full textAims: The hygienic condition of fish markets and retailer health safety plays a crucial role in maintaining fish quality and consumer health perspective as well. This study was designed to address the health condition of fish retailer and their awareness regarding this. The study was conducted in two important fish markets situated in Noakhali, Bangladesh.
Methodology: Information was collected through questionnaire interviews and participatory rural appraisal (PRA) from the randomly selected retailers (n=30)
Results: The retailers are mainly involved in selling various species of freshwater and marine water fishes, like as carps, catfishes, anabas, tilapia, koi, hilsa, shrimp, and other small indigenous fishes. Here, fish were mainly sourced from ponds (60%), but rivers and the sea (40%) are also the sources of fish. About 27% of the retailers had no basic education, 60%, 13% had primary level and secondary level of education. Though many of them were literate, their knowledge and practice of public health, hygiene, and sanitation were found to be very poor. Lack of proper preservation, ice and transportation facilities, a noticeable number of fish are losing their quality. Besides, about 20% of the fishermen did not use ice, which may cause deterioration of the quality of fish and health problems for the fishermen. They were found to be infected by various diseases such as common cold (cough, coryza, etc.), Diarrhea, lesions on different portions of the hand and legs, skin disease, and knee pain. tip fingers, between toes, on the nail and tip of toes, and skin disease on legs, respectively.
Conclusion: Therefore, the proper education and training on hygienic and sanitary conditions as well as sufficient knowledge on maintaining fish quality, are required for retailers involved in fish retailing in the markets
Profitability of Small-scale Grow-out Production of Caged Nile Tilapia, Oreochromis niloticus in the Volta Lake of Ghana
No full textThe profitability of small-scale grow-out caged Nile tilapia, Oreochromis niloticus production in the Volta Lake of Ghana was investigated within a period of 6 months (from July to December, 2022). The study site was part of the CSIR-WRI-ARDEC research and commercial facilities which lies between latitude 6° 13ʹ North and the longitude 0° 4ʹ East at Akosombo within the Asuogyaman District in the Eastern Region of Ghana. The study was carried out in a four-in-one floating fish cage of effective volume 112.50 m3 each; identified as C1, C2, C3 and C4. The 4 compartments were stocked with a total of 10,876 mono sex male juvenile O. niloticus, ranging between 50.0 and 90.0 g. The fish were stocked in the cages at varied numbers (C1: 5,144; C2: 1,728; C3: 2,606 and C4: 1,398) based on weight ranges (50.0-60.0 g, 61.0-70.0 g, 71.0-80.0 g and 81.0-90.0 g) of the total fish available for stocking. The initial mean weights were 53.04 ± 7.19 g, 67.45 ± 10.59 g, 73.49 ± 9.86 g and 84.19 ± 8.90 g for C1, C2, C3 and C4, respectively. The cultured fish were fed at declining rates of 4.0 to 1.5% with floating extruded pelleted commercial feeds of sizes 3.0 and 4.5 mm and 30.0% crude protein (CP﴿ contents, three times daily. After 127 to 204 days, the fish were harvested, graded, counted, weighed and sold. Profitability was determined using production and price parameters. Mean survival was 83.40 ± 17.88% and that of gross yield was 787.69 ± 235.05 kg cage-1 (6.15 ± 1.64 kg m-3﴿. Feed constituted the major (66.70%﴿ production cost whilst a mean of 37.15 ± 11.18% return on investment (ROI) was generated. Production of caged Nile tilapia was economically rewarding and for higher profit margins, number of cages and stocked fish per cage must increase
The Impact of Floating Net Cage Cultivation (FNC) on Primary Productivity in the Saguling Reservoir, West Java, Indonesia
No full textThis study aimed to analyze the impact of fish farming using floating net cage (FNC) system on primary productivity in Saguling Reservoir. Conducted between January and February 2025, the research utilized a comparative descriptive design at Saguling Reservoir, West Bandung Regency and in the Aquatic Resources Laboratory, Universitas Padjadjaran. Water sampling was performed at four stations based on varying levels of FNC activity to represent areas with and without aquaculture. The parameters measured included physical (temperature, transparency), chemical (pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), carbon dioxide (CO2), nitrate, ammonia, phosphate), as well as biological factors. Primary productivity was assessed using the light and dark bottle oxygen method with sampling conducted four times with weekly intervals. The results revealed that the highest primary productivity value is 746,028 mgC/m3/day, was recorded at station 2, which is situated in an area with a high density of FNC (1.203 units), while the lowest value was observed at station 1, 225,216 mgC/m3/day located in the reservoir inlet without FNC. The results indicate that FNC activities contribute significantly to increased nutrient levels (N and P), promoting phytoplankton growth and photosynthesis, thereby increasing primary productivity. The presence and intensity of FNC aquaculture significantly affect the trophic status and primary productivity in Saguling Reservoir. Management strategies should be implemented to monitor and control the density of floating net cages to preserve the reservoir’s ecological balance
The Toxicity of Weed Crusher (Paraquat Dichloride) on the Histopathological Effects on Juvenile Clarias gariepinous
No full textFish are particularly sensitive to a wide variety of agrochemicals including herbicides that may arise from not only deliberate discharge of these chemicals into waterways but also from approved agricultural practices. In the present study, the toxicity of weed crusher (Paraquat dichloride) an herbicide was investigated with emphasis on histopathological effects. Clarias gariepinus juvenile (mean body weight of 3.54±1.61g) and averaged average length 6.55±2.23 cm were exposed to 0, 0.06, 0.08, 0.1, 0 .12, and 0.14ml herbicide per litre of water (ml/l) weed crush (Paraquat dichloride). The lethal concentration (LC50) value of Paraquat dichloride was 0.007ml/l for 96 h of exposure. Paraquat dichloride concentration corresponding to the 96 h LC50 values for juvenile Clarias gariepinus was used to study the effects of Paraquat dichloride exposure for 4 days in inducing histopathological changes of gills. In the gills, filament cell proliferation, lamellar fusion, lamellar cell hyperplasia, and epithelial lifting were observed. The changes in gills occur predominantly in the 96 h exposure. Respiratory stress, erratic swimming and instant death of fish were observed in exposed fish, which varied with the concentration of the toxicant and this showed that mortality increased with increase in concentration. Paraquat dichloride is highly toxic to Clarias gariepinus, which are more susceptible to this herbicide; therefore their use near fish farm or in area close to aquatic environment should be discouraged
Aspects of the Biology of Heterobranchus bidorsalis in Oguta Lake, Imo State, Nigeria
No full textThe catfish H. bidorsalis is an important component of the local aquatic ecosystem in Oguta Lake. However, the ecological impact of this species remains poorly understood poorly understood, but is one of the common species that is highly valued as fish for food and for their commercial importance in freshwater artisanal fisheries in the country and other West African countries. This study aimed to investigate the length–weight relationship, condition factor, and feeding habits of H. birdorsalis in Oguta Lake, Imo State, Nigeria. A total of sixty fish specimens (ten per month) were collected bi-weekly for six months at three landing sites of fishers using gears such as gill net, cast net of various sizes (50mm to 100mm). The length-weight analysis, incorporating minimum and maximum values, revealed a negative allometric growth pattern, with a significant exponential b value of 2.4304 (log W = -1.0639 + 2.4304logL), indicating an accelerated increase in weight relative to length. The correlation coefficient (r = 0.9679) further underscored the robustness of this relationship. The species exhibited a diverse size range, with a minimum length of 15.5 cm and a maximum length of 33.6 cm. Corresponding weights ranged from 50.5g to 324g. The mean length and mean weight were 23.9 cm and 205.6g, respectively, with a mean condition factor of 1.64. The stomachs content was examined using the frequency of occurrence of each diet expressed as a percentage of the total number of specimens examined, which revealed a balanced trophic strategy, with insects (29.6%) and small fish parts (19.5%) dominating, followed by worms (13.8%) and aquatic plants (12.8%). These findings contribute valuable insights into the growth dynamics and ecological role of H. bidorsalis in Oguta Lake. The results have implications for fisheries management and highlight the need for conservation measures to sustain the ecological balance of this freshwater ecosystem. Protecting the natural habitats within Oguta Lake is essential to ensure the availability of diverse food resources and suitable environmental conditions for H. bidorsalis and other aquatic species. Regular monitoring of habitat quality and food availability to detect any changes and implement appropriate management strategies to mitigate potential threats is of great importance
Comprehensive Assessment of Fish Availability Across Seasons at Kismayo Landing Sites
No full textThis study examines the Comprehensive Assessment of Fish Availability Across Seasons at Kismayo Landing Sites, considering seasonal changes and their implications for local fishing practices. We gathered information by observing landings at Kibora Fish Landing Site and Kismayo Fish Market, and by speaking with local fishers and market vendors. We recorded the Somali, English, and scientific names of fish and shellfish species, noting when they were available throughout the year. We found that 19 pelagic species, including tunas (Thunnus albacares, Thunnus obesus), mackerels (Scomberomorus guttatus), and wahoo (Acanthocybium solandri), were more abundant from October to December and from February to April. On the other hand, demersal and reef-related species, such as seabream (Acanthopagrus berda) and spinefoot fish (Siganus sutor), as well as shellfish like lobsters (Panulirus spp.) and mangrove crabs (Scylla serrata), were around all year. This gives a reliable source of food and income for coastal communities. Seasonal fluctuations in the supply of pelagic fish influenced the volume of fishing, the gear used, and market dynamics. These results suggest that fisheries management plans should account for seasonal fluctuations. This will help protect marine resources for the future while keeping the fishing communities in Kismayo fed and financially stable