Population Dynamics of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) (Teleostei, Cichlidae), in Some Irrigation Reservoirs of Sri Lanka

Bandara, K.V.S.N.; Kumara, P.A.D. Ajith; Amarasinghe, U.S.

doi:10.33997/j.afs.2020.33.2.010

Cited by 4 publications

(2 citation statements)

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“…According to RIFFE (2021), in general, fisheries exploitation in inland waters in Indonesia is already overfishing (E > 0.5), except in Lake Limboto Sulawesi because the lake is vast and oligotroph, with no significant fishing activities (Table 7). According to Bandara et al (2020), Charernnate et al (2021), Feroz Khan et al (2021), Johnson et al (2020), Moreau & Sricharoendham (1999); and Tesfaye et al (2022), in general, fisheries exploitation in inland waters in several countries has been overexploited (E > 0.5) (Table 8).…”

Section: Fisheries and Aquatic Sciencesmentioning

confidence: 99%

“…O. niloticus in the Tamil Nadu Reservoir has an infinite length (L ∞ ) of 38.7 cm (male) and 37.6 cm (female), growth coefficient (K) = 0.65 year −1 (male) and 0.73 year −1 (female), fishing mortality (F) = 2.4 year −1 , the natural mortality (M) = 1.2 year −1 and the total mortality (Z) = 3.6 year −1 , exploitation (E) = 0.67. O. niloticus in the Sri Lanka Reservoir has an infinity length (L ∞ ) = 42.8 to 53.4 cm, growth constant (K) between 0.20 to 0.49 year −1 , exploitation rate (E) between (0.14) to (0.76) (Bandara et al, 2020).…”

Section: Fisheries and Aquatic Sciencesmentioning

confidence: 99%

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Acoustic-based estimation of fish stocks in Widas Reservoir, East Java, Indonesia

Aida,

Utomo,

Makmur

et al. 2024

Fish Aquat Sci

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Widas Reservoir is situated in an area of 570 ha in the Pajaran Village, Madiun Regency, East Java Province, Indonesia, playing an essential role in fisheries, with the average fish catch per year of about 283 tons/year. This study explores the standing stock, growth parameters, mortality, and exploitation rates of several dominant fishes in Widas Reservoir. This study was carried out from February to November 2019. Fish stocks were estimated using acoustic tools, fish catch records, and sizes collected by local enumerators. Fish length frequency sampling was conducted on several dominant fish species, such as Oreochromis niloticus, Barbonymus gonionotus, and Osteochilus vittatus. Based on the length-frequency data, estimating fish population dynamics, the fish population dynamics (infinitive length (L ∞ ) and growth coefficient (K)) estimation was run in a time series using the Fish Sock Analysis Tool, II (FISAT II) program package. Moreover, the estimation of natural mortality parameters, the fishing mortality parameter, and the exploitation rate was also performed. The approximated overall fish stock in the Widas Reservoir was about 79,848 kg, which lowered with the increase in water depth. Of particular concern, in the surface layer at a depth between 1-5 m, the fish stock reached 58,813 kg, while in the deeper zone (> 15 m), the value significantly lowered by about 98%, reaching 1,219 kg. These results indicate an overfishing in the Widas Reservoir. The value of the exploitation rate (E) of B. gonionotus was 0.748, O. niloticus 0.8, and O. vittatus 0.7, respectively, proving the overfishing states occurred in the study area. Therefore, regulations governing the number of catches and the use of fishing gear are crucial in Widas Reservoir, particularly the use of lift and gill nets with a mesh size of less than 2 cm.

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Section: Fisheries and Aquatic Sciencesmentioning

confidence: 99%

Section: Fisheries and Aquatic Sciencesmentioning

confidence: 99%

Acoustic-based estimation of fish stocks in Widas Reservoir, East Java, Indonesia

Aida,

Utomo,

Makmur

et al. 2024

Fish Aquat Sci

View full text Add to dashboard Cite

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Length-Based Stock Assessment of Smith's Barb, Puntioplites proctozystron (Bleeker, 1865) (Cyprinidae) and Asian Redtail Catfish, Hemibagrus nemurus, (Valenciennes, 1840), (Bagridae) in a Multipurpose Reservoir in Thailand

CHARERNNATE¹,

Noranarttragoon²,

Jutagate³

2021

AFS

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Catches from inland fisheries in Thailand are about 200,000 tonnes annually and plays an important role in food security and subsidiary income. However, fish stocks are seldom assessed because of the lack of catch and effort data. In this study, two fish stock assessment models, viz., relative yield per recruit and length-based spawning potential ratio, were used to evaluate the status of two species as well as to highlight their applications to datalimited situation in Thailand. The study was conducted at Kangkrajan Reservoir, Thailand, for two targeted species, viz., Smith's barb, Puntioplites proctozystron (Bleeker, 1865) and Asian redtail catfish, Hemibagrus nemurus (Valenciennes, 1840) using length frequency data. The data were collected throughout 2019. Both species showed isometric growth. Von Bertalanffy growth parameters were estimated. Asymptotic length, curvature parameter and theoretical age at length zero were 36.2 cm TL, 0.39 yr-1 and -0.28 yr for P. proctozystron, respectively, and 63.2 cm TL, 0.37 yr-1 and -0.32 yr for H. nemurus. The exploitation rates reveal that both species are slightly overfished. Sizes at 50 % maturity and 50 % selectivities were 17.8 and 23.5 cm TL for P. proctozystron, respectively, and 15.6 and 20.8 cm TL for H. nemurus. Considering both parameters, the size at first capture to sustain the fisheries of P. proctozystron and H. nemurus should be >18 cm and >30 cm, respectively, which can be achieved by mesh-size regulations.

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Inventaire spécifique et caractéristiques de quelques frayères du lac de Buyo dans le Parc National de Taï (Sud-Ouest Côte d’Ivoire)

Rosemonde¹,

Konan²,

Ida³

et al. 2020

JABs

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Objectifs : Des investigations ont été menées dans 11 sites du lac de Buyo situés sur le cours du fleuve Sassandra dans le Parc National de Taï (Côte d’Ivoire) en vue de connaître les espèces de poisson qui utilisent ces zones comme sites de reproduction. Méthodologie et Résultats : Dans chaque site d’échantillonnage, les variables environnementales ont été mesurées et les poissons ont été capturés à l’aide de filets maillants. Les stades de maturité sexuelle avancés ont été considérés comme critères de reconnaissance des sites de fraie. La richesse spécifique a été de 32 espèces, répartie en 13 familles et dominée par les Cichlidae (7 espèces, soit 22%). Sur la base des stades sexuels de maturité, 14 espèces, en phase de reproduction, ont été capturées dans les 11 sites d’échantillonnage. Les résultats de l’analyse des sédiments ont indiqué une prédominance de sable (>60%) dans les sites de reproduction et des valeurs optimales de température (28,52°C), de pH (6,53), de conductivité (36,50 μS/cm) et d’oxygène dissous (5,37 mg/l). Conclusion et application des résultats : La présente étude a montré que les sites échantillonnés dans le lac de Buyo situé à l’intérieur du le Parc National de Taï sont caractérisés par des sédiments sableux et constituent des frayères pour plusieurs espèces de poisson. La localisation de ces zones de reproduction représente donc un outil important pour les gestionnaires dans la conservation de la diversité piscicole du parc national de Taï. Mots clés : sites de frai, stade de maturité sexuelle, ichtyofaune, lac de barrage de Buyo. Specific inventory and characteristics of some spawning grounds of Lake Buyo in the Taï National Park (South-West Côte d'Ivoire) Abstract Objectives: Investigations were carried out in 11 sites of Lake Buyo located in the midstream of Sassandra River in Taï National Park (Côte d'Ivoire) to get to know fish species that use these areas as spawning sites. Methodology and Results: Environmental variables were measured in each sampling sites and fish were caught using gillnets. Advanced stages of sexual maturity were considered as recognition criteria of spawning areas. Specific richness was of 32 species, belonging in 13 families and dominated by Cichlidae (7 species, 22%). Based on advanced sexual maturity stages, 14 species in spawning period, were captured at the 11 sampling sites. Results of sediment analysis indicated a predominance of sand (> 60%) in spawning sites and optimal values of temperature (28.52°C), pH (6,53), conductivity (36,50 μS/cm) and dissolved oxygen (5,37 mg/l). Conclusion and application of results: The present study showed that sites sampled in Lake Buyo located within the Tai National Park are characterized by sandy sediments and constitute spawning areas for several fish species. The location of these spawning areas therefore is an important tool for managers in conserving fish diversity of Taï National Park. Keywords: spawning sites, stage of sexual maturity, Ichtyofauna, Buyo Dam Lake.

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Population Dynamics of Nile Tilapia, Oreochromis niloticus (Linnaeus, 1758) (Teleostei, Cichlidae), in Some Irrigation Reservoirs of Sri Lanka

Cited by 4 publications

References 0 publications

Acoustic-based estimation of fish stocks in Widas Reservoir, East Java, Indonesia

Acoustic-based estimation of fish stocks in Widas Reservoir, East Java, Indonesia

Length-Based Stock Assessment of Smith's Barb, Puntioplites proctozystron (Bleeker, 1865) (Cyprinidae) and Asian Redtail Catfish, Hemibagrus nemurus, (Valenciennes, 1840), (Bagridae) in a Multipurpose Reservoir in Thailand

Inventaire spécifique et caractéristiques de quelques frayères du lac de Buyo dans le Parc National de Taï (Sud-Ouest Côte d’Ivoire)

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