Asian Journal of Fisheries and Aquatic Research
Not a member yet
1022 research outputs found
Sort by
Sea Surface Temperature Variability in NHA Trang Bay, Viet Nam: Patterns and Mechanisms
No full textSea surface temperature (SST) serves as a fundamental parameter influencing numerous oceanic processes, and its measurement is facilitated by various remote sensing platforms operating at different scales. In Nha Trang Bay, SST emerges as a pivotal state variable for scrutinizing climate change dynamics by using dataset of Multi-scale Ultra-high Resolution Sea Surface Temperature (MUR SST). Over recent years, the annual mean SST in Nha Trang\u27s waters has exhibited an upward trend, registering a notable increase of 0.4°C from the period spanning 2008-2013 to 2014-2018. However, beginning in 2019 up to the present (July 2023), SST has displayed marked fluctuations, characterized by considerable complexity and heightened values. These fluctuations are largely attributed to El Niño-Southern Oscillation (ENSO) events, which exert a substantial influence on SST patterns in Nha Trang Bay. Consequently, these shifts in SST have had significant consequences for the bay\u27s biota. Understanding and mitigating these effects are crucial for safeguarding the ecological integrity of Nha Trang Bay amid ongoing climatic variability
The Effect of Adding Em4 to Moist Pellets on the Growth and Survival of Snubnose Pompano (Trachinotus blochii)
No full textSnubnose Pompano (Trachinotus blochii) is a species that is still relatively new to be cultivated in Indonesia but has great potential to be developed because it has high nutritional content. However, in cultivation activities, expensive feed and low dietary quality are obstacles that cultivators often complain about. The solution to high feed prices is that additional ingredients (addictive feed) are needed that can increase the growth and survival of fish, there by reducing production costs and providing alternative feed other than just trash fish. Additional ingredients known on the market are Effective Microorganism-4 (EM4) probiotics. So this research aims to analyze further the effect of adding the probiotic Effective Microorganism-4 (EM4) at different doses on growth, feed efficiency levels, and survival of Snubnose Pompano (Trachinotus blochii) seeds. Based on the results of the research carried out, it can be concluded that the addition of EM4 to moist pellets has an influence on the absolute length growth of the Snubnose Pompano (Trachinotus blochii) which is the best in the 80% treatment (P4) which is not significantly different from the 70% treatment (P3), however substantially different from the Control (P0), 50% (P1), and 60% (P2) treatments. Based on the results of the research carried out, it can be concluded that the addition of EM4 to moist pellets has an influence on the growth in absolute length, absolute weight, specific growth rate, survival rate, FCR and feed efficiency of the best Snubnose Pompano (Trachinotus blochii), namely at 80% treatment
Effect of Nanoparticle and Essential oil Addition on Kappa Carragenan-based Bionanocomposite Films: A Review
No full textThe issue of plastic waste has become a global concern due to its negative impact on environmental sustainability. Bionanocompsites are a combination of composite materials made from natural materials with nano-sized organic or inorganic fillers that are biodegradable. Kappa carrageenan-based bionanocomposite films offer an eco-friendly solution for packaging. Kappa carrageenan is one of the natural polymers that can be used as a biofilm constituent material which is recognized to form a good film due to its ability to form a strong and stiff gel, but still has limitations in water vapor permeability and lower mechanical properties. The use of nanoparticles and essential oil into carrageenan-based films can improve the characteristics including mechanical properties, optical properties, barrier properties, and act as antibacterial and antioxidant in the films
Comparative Growth Performance of Genetically Improved, Chinese, and Local Strains of Rainbow Trout (Oncorhynchus mykiss) in Mid-hill Nepal
No full textAims: This study aimed to evaluate the growth performance of rainbow trout fry (Oncorhynchus mykiss) derived from the best performing families in a previous experiment.
Study Design: Experimental (Original Research Article).
Place and Duration of Study: Fisheries Research Station (FRS), Trishuli Nepal, between April 2021 and June 2021.
Methodology: A total of 2700 fry with similar initial weights were randomly assigned to three groups based on their origin: Farmers Trout (T1:1.39±0.16g), Chinese Trout (T2: 1.40±0.06g), and Genetically Improved Trout (T3: 1.19±0.1g), each group replicated thrice with 300 fish per tank. The parameters assessed were weight gain, feed conversion ratio, and survival rate. All fish were fed farm-made feed for 90 days with fortnightly sampling.
Results: The Genetically Improved trout group exhibited the highest weight gain (14.22±0.51g), followed by the Chinese trout (13.08±0.24g), and Farmers trout (10.77±0.82g) groups (P=.01). The specific growth rate followed a similar trend, with the Genetic group showing the highest value of 4.28±0.08% and the Farmers group showing the lowest value of 3.60±0.07% (P=.01). However, there was no significant difference in the feed conversion ratio among the groups, which ranged from 0.77 to 1.07. Conversely, the Chinese group\u27s fry demonstrated a significantly higher survival rate (77.94±3.63%) compared to the Genetic (72.33±1.09%) and Farmers (59.28±4.6%) groups (P=.02).
Conclusion: The weight gain and growth rate of genetically enhanced rainbow trout is considerably higher and may enhance the production and profitability of the rainbow culture in Nepal. However, the performance of genetically improved trout requires more validation in farmer’s raceways
Behavioral, Biometric and Oxidative Stress-Induced Alterations in Clarias gariepinus Juveniles Exposed to Chlorpyrifos
No full textChlorpyrifos is an organophosphate pesticide used to kill wide range of pest including insect and worms. The present study investigates the behavioral, biometric and oxidative stress alterations in Clarias gariepinus juveniles exposed to chlorpyrifos. The 96 h LC50 values of the pesticide estimated by probit analysis was 4.67 mg/L while the toxic unit was 21.41 indicating that the pesticide is very toxic. Fish were exposed to chlorpyrifos sublethal concentrations of 0.43 mg/L and 0.93 mg/L and the behavioral, biometric and oxidative stress parameters were determined on day 1, 5, 10, and 15. The results indicate changes in the behavior and hepatosomatic indices in C. gariepinus at different chlorpyrifos concentrations and time. There were concentration and duration dependent increase in lipid peroxidation, protein and glucose but mixed trends in catalase values. The use of chlopyrifos in the environment especially near aquatic ecosystem should be strictly monitored to avoid the hazards associated with its application
Inventory of Seaweeds in Selected Municipalities in the Balicuatro Area of the Province of Northern Samar, Philippines
No full textSeaweeds or marine macroalgae is one of the marine resources that are understudied in the province of Northern Samar, the province have twenty-four (24) municipalities and twenty (20) of them have coastal zone which is ideal for marine researches as well as for aquaculture. This study is focused on the present seaweeds in the three (3) selected municipalities in Balicuatro area in the province of Northern Samar. A total of ninety-four (94) taxa were collected/ found in the three (3) sampling sites. Lavezares got the greatest number of seaweeds with sixty (60) taxa, followed by Biri with fourty-four (44), and the least was in Allen with thirty-four (34) species. Chlorophyta have thirty-nine (39) species which constitute for 39.36% of the total identified seaweeds, followed by thirty-four (34) red seaweeds (36.17%), and, lastly, Brown macroalgae with only twenty-three (23) species which accounts for 24.47%. The most common marine macroalgae in all sampling sites were: Hormophysa cuneiformis which was found in ten (10) sampling sites, followed by Halimeda macroloba, Ulva reticulata, and Sargassum oligocystum which were found in ten (10) sampling sites. In terms of environmental parameters, temperature and salinity of all sampling sites were tested to be within the normal range during the collection period based on established threshold limit. However, in terms of pH, it was detected that two (2) barangays/ sampling sites in Lavezares, namely: Balicuatro and San Juan which only had 7.2 and 7.4 which is below the threshold limit range of seawater pH which is 7.5-8.5. In terms of substrate, rocky substrate is common to all sampling sites which indicates that hard substratum is preferable for the growth, adaptation, and survival of seaweeds
Evaluation of the Impact of Feed Types on Reproductive Performance and Growth of Clarias gariepinus under different Culture Systems
No full textThe study evaluated the impact of farm-made and commercial feed types on reproductive performance and growth of Clarias gariepinus under different culture systems (tarpaulin, concrete, metal and earthen pond). The research was conducted for 56 weeks in a newly constructed 1m3 (4ft by 4ft by 4ft) stocked with 20 juveniles each and it was established that fecundity was significantly different (P<0.05), with the highest value (320,366.67 ± 14359.01eggs) obtained in fish fed Commercial feed C in Concrete tank C and the lowest value in the Earthen pond fed farm-made feed (153,533.33 ± 6053.1900 eggs). The results obtained in this study showed fertilisation was significantly different, with the highest value in Metal tank B fed Commercial feed B (83.52 ± 0.76 %), whereas earthen pond A fed farm-made feed recorded the lowest value (63.73 ± 2.27 %). The growth rate showed that the Highest mean weight gain of 3824.23±373.69 was recorded in Con B and the lowest of 2035.57±252.04 in Tarp A. The highest specific growth rate of 2.85±0.19 was in fish fed commercial feed C in Meta tank C and the lowest of 2.45±0.11 in fish fed farm-made feed in Tarp A. Growth parameters including length gain (cm), weight gain (g), specific growth rate (%/day), and percentage weight gain (%), were significantly better (P<0.05) in fish fed commercial feed B in the concrete tank although fish fed farm made feed and commercial feed A in other tanks showed some impressive competition. Therefore, feeding fish with commercial feed C in concrete pond C and metal tank B with Commercial feed B is recommended for better reproductive performance while the use of commercial feed B in Concrete pond is recommended for fish growth although fish fed farm-made feed and commercial feed A in other tanks showed some impressive competition
Effectiveness and Management Strategy of Tual Archipelago Fishing Port in Supporting Measured Fishing
No full textMeasured Fishing (MF) is the government\u27s effort to preserve fish resources by optimizing economic and social benefits for fishermen and fishery business actors. One of the government\u27s efforts to prepare for the implementation of the MF policy, the Ministry of Maritime Affairs and Fisheries through the Directorate General of Capture Fisheries continues to improve the preparation of fishing ports to carry out these activities. This requires the main role of Archipelago Fishing Port (AFP) Tual as a fishing port managed by the central government to be able to improve its function as an executor of government functions as well as provide services to the fishing fleet and other service users who need these services. This study aims to analyze the effectiveness of the role and function of AFP Tual in supporting Measured Fishing and analyze Tual\u27s AFP strategy in supporting Measured Fishing. The data analysis technique used to measure the effectiveness of the role and function of AFP Tual was score assessment using the rating scale formula. Meanwhile, the data analysis technique to determine the AFP Tual strategy was to use the SWOT matrix, the Internal Factor Analysis Summary (IFAS) matrix, and the External Factor Analysis Summary (EFAS) matrix to determine the SWOT matrix quadrant. The results of this study showed that the effectiveness of the role and function of AFP Tual is at a score of 84.5%, which means that it is very effective in supporting the program measured fishing. Based on the SWOT analysis, it is in favorable conditions so that it can take advantage of the existing opportunities. The strategy that must be implemented in this condition is to support an aggressive growth policy (growthoriented strategy) in supporting Measured Fishing so that the goals of MF can be maximally achieved
Recruitment Index as a Novel Approach to Assessing the Resilience of Natural Mangrove Ecosystems: A Case Study on the Coast of West Muna Regency
No full textThis study aims to determine the resilience of mangrove ecosystems with a recruitment index approach on the coast of West Muna Regency. The recruitment index in mangrove ecosystems reflects the comparison between the number of newly established mangrove seedlings and saplings and the number of mature mangroves. The research method used quadrant transects (10 x 10 m2). Analysis of the resilience index is based on the recruitment index (RI) with the equation RI = Ln ((0.7 x DSd/DT.)+ (DSp/DT)). The results showed that the mangrove ecosystem in all stations had a high resilience with an RI value of 1.43 for station I, 1.38 for station II, 1.07 for station III, and 1.05 for station IV. Meanwhile, mangrove species with very high resilience categories are B. gymnorrhiza (RI = 1.70) and B. cylindrica (RI = 1.63). In comparison, the resilience of S. alba (RI = 0.90) and R. stylosa (RI = 1.22) is classified as medium and high resilience, respectively. Based on the RI value, the mangrove ecosystem on the coast of West Muna Regency is in the high resilience category (RI = 1.25 ± 0.20). It indicates that the mangrove ecosystem on the coast of West Muna Regency has good regeneration and growth abilities, so it can recover even when under ecological pressure
A Comparative Study on Growth Rates and Length-weight Relationships of Snow Trout (Schizothorax sp.) from Rasuwa, Nuwakot, and Okhaldhunga Districts of Nepal
No full textAims: Snow trout (Schizothorax spp.) are vital to Nepal\u27s aquatic biodiversity and economy, yet little research has addressed their growth potential under controlled conditions. This study aimed to evaluate the growth performance of snow trout from three regions of Nepal (Okhaldhunga, Nuwakot, and Rasuwa) in captivity.
Study Design: Original Research Article.
Place and Duration of Study: Fisheries Research Station (FRS), Trishuli Nepal, between August 18 November 24, 2023.
Methodology: Schizothorax species were collected from Okhaldhunga, Nuwakot, and Rasuwa districts and acclimated to the environment of the FRS in three separate raceways prior to the feeding trial. From each location, a population of 450 apparently healthy and uniform sized snow trout (initial weight: 20.00 + 1.2g) were then distributed into 3 raceway tanks, altogether 9 raceways for 3 groups, feeding upon the commercial feed (48% crude protein) in the form of dough at 3% of the body weight for 90 days. At the end of the feeding trial, growth parameters, including weight gain, specific growth rate (SGR), condition factor (K) and Length-weight relationship (LWR) were measured. Survival rate and water quality parameters were also measured. Statistical analysis for group’s means differences was conducted using one-way ANOVA in R Studio for Windows at a 5% level of significance.
Results: Results indicated Fish from Nuwakot exhibited the highest weight gain (3.61 ± 1.82 g) and SGR (0.23 ± 0.12% per day), though these differences were not statistically significant (P >0.05). The condition factor (K) was highest for Rasuwa fish (0.98), followed by Nuwakot (0.97) and Okhaldhunga (0.97) (P >0.05), indicating that the fish were relatively thin, possibly due to poor nutrition or stressful conditions. The LWR analysis revealed high length-weight correlations for all groups, with Rasuwa fish exhibiting a positive allometric growth pattern (b=3.02), whereas Okhaldhunga (b=2.93) and Nuwakot (b=2.94) fish showed negative allometric growth patterns. This may suggest that snow trotu from Rasuwa were in relatively good physiological condition and adapting well to the rearing conditions at the FRS. Although with no statistical difference, the survival rate was highest for fish from Nuwakot (86.67%), followed by Rasuwa (80.00%) and Okhaldhunga (77.33%) (P >0.05). This may indicate the adequacy of the water quality (average temperature 11.75 ± 0.42℃, dissolved oxygen more than 7 mg/L, and pH 7.71 ± 0.16) maintained during the study.
Conclusion: The findings suggest that while the snow trout demonstrated the ability to survive yet grow slowly under captivity, their growth performance may be significantly enhanced by optimizing rearing conditions, particularly slightly higher water temperature. This study underscores the need for targeted improvements in aquaculture practices to support the effective domestication and conservation of snow trout in Nepal