Asian Journal of Fisheries and Aquatic Research
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Population Dynamics of the Fish Species Brama brama (Bonnaterre, 1788) in the Central-eastern Atlantic Ocean, Côte d\u27Ivoire
No full textTo find out more about the exploitation status of the fish species Brama brama in Côte d’Ivoire, population dynamics were undertaken with Logiciet FiSAT II (FAO-ICLARM Stock Assessment Tools) software (version 1.2.2). Samples were collected from artisanal marine fishermen landing at the Abobodoumé pirogue wharf, Abidjan. The study of this population dynamics is the first of its kind in the central-eastern portion of the Atlantic bordering Côte d\u27Ivoire. A total of 505 individuals were collected. Most were small, ranging in size from 18 to 36 cm, and weighing 95.6 to 523.4 g respectively. Von Bertalanffy growth was deployed using FiSAT II to determine the growth parameters of this Atlantic pomfret. The asymptotic length is L∞ = 35.70 cm, with a growth performance Ø\u27 = 3.25, justifying the high specific growth rate K = 1.4 yr-1. Theoretical age (t0 = - 0.97 yr-1) and longevity or maximum age (tmax = 2.14 yr-1) were determined. This maximum age obtained in Ivorian waters confirms that the fish caught are too young. Natural mortality for this species (M = 2.14 yr-1) is lower than fishing mortality (F = 4.01 yr-1). The exploitation rate (E = 0.65) is higher than the critical value (E = 0.5). These results suggest that this species is overexploited in Ivorian waters, even though the size of first capture is greater than the size of first maturity
Evaluating Black Soldier Fly and Bloodworm Larvae Meals as Sustainable Protein Sources for Growth and Survival of Red Hybrid Tilapia (Oreochromis spp.) in the Nursery Phase
No full textAims: This study aimed to assess the effects of using insect larvae meals, such as BSF and BW larvae, as alternative feeds to commercial pellets on the growth performance and survival of Oreochromis spp. at the nursery stage.
Study Design: This study followed the randomized control treatment with three different diet.
Place and Duration of Study: This study was carried out at the Fisheries Research Institute Glami Lemi (FRIGL) in Negeri Sembilan, Malaysia, within 35 days from July to August 2023.
Methodology: A total of 360 red hybrid tilapia (Oreochromis spp.) fingerlings weighing 0.62 ± 0.06 g were randomly distributed into 12 rectangular aquarium tanks (250mm) at a stocking density of 30 fish per tank. They were fed with commercial pellets (CP), Black Soldier Fly (BSF) larvae, and Bloodworm (BW). The feed amount was calculated at 10% of the total body weight per tank, with feeding conducted three times daily. The experimental setup was performed in triplicate. For the analysis of growth performances and fish survival, sampling was conducted weekly.
Results: BSF larvae meal had high lipid and protein content, measuring 35.35 ± 0.21% and 29.67 ± 0.98%, respectively. BW larvae meal also showed high lipid and protein content, with 28.23 ± 1.33% and 27.94 ± 0.52%, respectively. Fish fed with BSF and BW larvae exhibited significantly higher survival rates, 93.3 ± 3.3% and 86.7 ± 14.5%, respectively, compared to the control group. Meanwhile, the group fed with the commercial pellet showed the lowest survival rate, just 74.4 ± 12.6%. Fish fed with the BW larvae recorded the highest weight gain, 1.07 ± 0.16 g, followed by fish fed with BSF larvae, 0.66 ± 0.11 g, and then fish fed with commercial pellets, 0.41 ± 0.09 g.
Conclusion: Both BSF and BW larvae exhibited significant growth response properties to tilapia fingerings compared to commercial pellets. The findings from this study are promising and should be further verified at the farm scale
Culture Suitability of Macrobrachium rude with Carp Polyculture in Bangladesh
No full textThe experiment assessed the production performance of Gura Chingri (Macrobrachium rude) in polyculture systems across different stocking densities over six months from February 2023 to July 2023. Three treatments (T1, T2, and T3), replicated three times each, were implemented, with varying stocking densities for Gura Chingri, Suborno Rui, Catla, and Silver carp. Following stocking, formulated feeds containing 28-30 % protein was administered, initially at 8% of biomass, gradually reduced to 3%. After six months, the highest mean final weights for individual Prawn (1.10±0.10) g, Suborno Rui (445.68±24.6) g, Catla (511.80±15.72) g, and Silver carp (560.15±13.26) g were recorded in the T2 treatment. Suborno Rui exhibited significantly lower growth performance in T1 compared to T2 and T3, while Chingri showed statistically significant higher growth performance in T2 compared to T1 and T3 (p < 0.05). The food conversion ratio (FCR) was significantly lowest in T2 (1.66) and highest in T1 (1.78) (p < 0.05). Additionally, the highest survival rates were observed in T2 for Prawn (62.21%) g, Suborno Rui (98.7%) g, Catla (98.5%) g, and Silver carp (99.82%) g. Based on these findings, carp polyculture can be an effective way for the farmers to achieve optimal production and financial benefits in Gura chingri culture. Further research is needed to develop consistant and environmentaly sustainable culture system of Gura chingri
Understanding Overfishing: A Literature Review
No full textFishery resources are in danger due to the increase in the world’s population, which has led to overfishing, manifested in several ways but very little noticeable and apprehensive. So, to reveal the characteristics of overfishing, a bibliographical synthesis was made. Thus, a typology, manifestations and drawbacks with some methods of overfishing are presented. It is an excessive fishery that leads to a decrease in the average size of individuals caught, a decrease in their reproductive capacity, in their number until their disappearance, and even negative impact on the income of the fishermen. This definition includes: i- growth overfishing, which occurs when juveniles are caught before they have a chance to grow (Lc50< Lm50); ii- recruitment or reproduction overfishing, when adult fish are fished in large numbers affecting their reproduction, hence the overfishing of reproduction (Lm50 < Lopt and % of sexually mature fish in catches below the target reference point; iii- ecosystem overfishing, where the decline of a previously abundant fish stock is not offset by an increase in stocks of other species; iv- economic overfishing, where fishing effort exceeds that necessary to maximize economic rent; v- Malthusian overfishing, which manifests itself in the overpopulation of fishermen making a great effort to maintain their income and sources of animal protein
The Growth & Survival of Tilapia Fry (Oreochronis niloticus) with the Addition of Fermented Coconut Pulp to Feed
No full textFeed is one of the components that support the aquaculture business, hence the available feed must be sufficient and meet the needs of the fish. The use of coconut pulp as a feed ingredient is limited by its low protein content and high crude fiber content, which reduces the feed\u27s digestibility level. Fermentation is a technology used to increase protein content and reduce crude fiber content, and increase protein digestibility. A. adding fermented coconut pulp 65%, commercial feed 35%, B. adding fermented coconut pulp 45%, commercial feed 55%, C. adding fermented coconut pulp 25%, 75% commercial feed, D. Control (100% commercial feed). This study aimed to analyze the effect of adding fermented coconut pulp to the commercial feed on the growth and survival of tilapia fry (Orechromis niloticus). The research is an experimental study using a Completely Randomized Design (CRD) with 4 treatments and 3 replications for 12 experimental units. The results showed that the addition of fermented coconut pulp to tilapia feed had no significant effect on absolute weight and absolute length growth, but had a significant effect on the survival rate of tilapia fry. The best dose of adding fermented coconut pulp to the feed was found in the 25% treatment. The addition of fermented coconut pulp up to 45% did not make a significant difference with the use of commercial feed (control). This indicates the addition of fermented coconut pulp up to 45% can still be given to fish, hence it can be recommended that the addition of fermented coconut pulp to the feed should not exceed 45%
Comparative Study of Inducing Broodstock with Natural and Artificial Hormones on Reproductive Performances of Clarias gariepinus
No full textThis study was conducted to investigate the effects of artificial and natural hormones (ovaprim and pituitary extract) on the reproductive performances of Clarias gariepinus (African catfish). A total of twenty brood stock, 12 males and 8 females with mean weight of 2.0 kg each were selected for breeding following the external morphological characteristics and standard breeding procedure. The water parameters for indoor culture tanks during the study were optimal for breeding: pH 7.31; temperature, 27.6˚C. Dissolved oxygen, 5.18 mg L-1. The result revealed no significant (P > 0.05) differences in water quality parameters between the culture tanks for artificial and natural hormonal applications during the study. The percentage fertilization, hatchability, survival and fry production success were: 89.23%, 93.31%, 87.16% and 69.41%; and 79.02%, 72.56%, 67.32% and 34.67% respectively, for pituitary extract and Ovaprim®. Pituitary extract recorded higher values and significantly performed better (P < 0.05) between the two treatments. This indicates that natural hormone (pituitary extract) is equally effective and therefore recommended for the artificial propagation of Clarias gariepinus
Molecular Parentage Analysis in Aquaculture: Principles, Applications, and Challenges: A Review
No full textMolecular parentage analysis is a powerful tool for reconstructing pedigrees and estimating genetic parameters in aquaculture species. It is based on the comparison of DNA marker genotypes between offspring and potential parents. This review provides a concise overview of molecular parentage analysis in aquaculture, covering its principles, methods, applications, challenges, and limitations. It describes common DNA markers, including microsatellites and single nucleotide polymorphisms (SNPs), used in parentage analysis and the criteria for their selection. The software and statistical methods for assigning parentage and evaluating the accuracy and power of the assignment are also discussed. This review demonstrates applications for estimating genetic parameters, investigating inbreeding, evaluating reproductive success, and improving selective breeding programs. In conclusion, while molecular parentage analysis is a valuable tool for improving genetic management in aquaculture, careful planning, implementation, and interpretation are essential
Type Abundance and Relative Abundance of Macrozoobentos in the Intertidal Zone of Marabatuan Island, Kotabaru, Indonesia
No full textThe structure of macrozoobenthos communities plays a crucial role in aquatic ecosystems because most of them are in the second or third trophic level. Components of macrozoobenthos community structure include species and abundance, species diversity index, species uniformity index, dominance index. The research aims to analyze species abundance and relative abundance of macrozoobenthos in the intertidal zone of Marabatuan Island, Kotabaru, Indonesia. The research location is on Marabatuan Island, Pulau Sembilan District, Kotabaru Regency, South Kalimantan Province. The highest relative abundance (KR) was at station 3, namely the species Ophiocoma erinaceus, from the Asteroidea class, the second highest value was at station 2 with the species Holothuria atra and at station 1 of the same species, namely Holothuria atra from the Asteroidea. The lowest relative abundance was at station 1 of the Linckia laevigata species. The Diversity Index (H\u27) of macrozoobenthos at all stations is in the medium criteria
Influence of Tank Water Depths on Reproductive Performance of Catfish (Heterobranchus longifilis) Valenciennes, 1840
No full textAims: To determine the optimum water depth required for catfish spawning in hatcheries.
Study Design: Treatments were assigned using complete randomized design.
Place and Duration of Study: Fish Farm Complex of the Akwa Ibom State University (AKSU), Nigeria.
Methodology: Eighteen (18) similarly-sized H. longifilis broodstock (2.51-2.53 kg, 64 – 66 cm): comprising six broodstock of three males and three females, were held for six months at 0.50 m, 0.75 m and 1.0 m pond water depth. All males were sacrificed for milt extraction without hormonal inducement; with milt from each treatment diluted with normal saline solution. Female broodstock from each treatment were separately induced with ovaprim hormones at a single dosage of 0.5ml/kg body weight of fish and allowed for 16 hours before manual stripping; 3g of egg from each broodstock and mixed with the diluted milt and activated with 100 ml of normal saline. The fertilized eggs were incubated and thereafter assessed for percentage fertilization, hatchability, survival and fry production success.
Results: broodstock reproductive parameters significantly increased (P = 0.00) with water depth of broodstock culture tank. Percentage fertilizations were: 49.50±0.78, 68.17±0.93, and 82.50±1.44; respectively. Percentage hatchability of broodstock eggs were: 91.37±1.65 significantly higher for 1.0 m water depth group than 67.79±4.58 from 0.75 m water depth treatment while the least value of hatchability 50.31± 0.78 was recorded for broodstock raised at 0.50 m water depth. The fish group raised at 1.0 m water depth also exhibited highest percentage survival value of 97.02 ± 1.09 and fry production success value of 73.08 ± 0.53 while broodstock raised at 0.50 m water depth indicated the least values: % survival, 8.38 ± 0.48 and fry production success of 2.07 ± 0.07. Conclusion: In times or places of water scarcity, H. longifilis broodstock may be raised at pond water of 0.5 m to 1.0 m. But the water depth that would afford the best breeding and reproductive performance is at 1.0 m depth
Mollusca Community Structure and Distribution in Jatigede Reservoir Sumedang, as Natural Feed Materials
No full textMollusca live in shallow waters and can be found around the Jatigede Reservoir. Mollusca can serve as indicators of water quality and can be utilized as natural feed materials due to their significant nutritional content. The results showed that the mollusca community structure in Jatigede Reservoir, Sumedang, had Shannon-Whienner diversity index (H\u27) values ranging from 0 - 1.08, categorized as low to moderate diversity. Evenness index (E) values ranged from 0 - 0.76, categorized as low to high evenness. Dominance index values ranged from 0.42 - 1, categorized as moderate to high dominance. Each research station was dominated by the species Filopaludina javanica. Based on the water quality index (FBI), Jatigede Reservoir, Sumedang, is categorized as slightly poor to poor with values ranging from 6 - 6.57. Species found during the study include Filopaludina javanica, Pilsbryoconcha exilis, Anodonta woodiana, Thiara scabra, and Indoplanorbis exustus. Species that can be used as alternative feed materials or supplementary feed materials include Filopaludina javanic