Population dynamics of Pseudoplatystoma metaense Buitrago-Suárez & Burr, 2007 (Pisces, Siluriformes: Pimelodidae) from the Northwestern Orinoco River Basin
Dinámica poblacional de Pseudoplatystoma metaense Buitrago-Suárez & Burr, 2007 (Pisces, Siluriformes: Pimelodidae) en la cuenca noroccidental del río Orinoco
Keywords:
Apure River, Matafraile catfish, overfishing, population dynamics, Venezuela
Abstract
The Matafraile catfish (Pseudoplatystoma metaense Buitrago-Suárez& Burr, 2007) is the second most important commercial species in the Apure River region. This species, besides being one of the most abundant, is under strong fishing pressure, and despite its commercial importance, there is no information on its population dynamics and exploitation patterns, which is crucial to guide its sustainable management. The objective of the present study was to generate essential biological parameters to determine the status of the P. metaense stock in the Apure River basin, based on size frequency data, collected monthly from commercial landings during the period 1996 - 2003. Some of the population parameters of the species were estimated through empirical relationships and analyzed using fishery stock assessment models (Beverton & Holt 1957). The Yield per Recruit (Y/R) and Biomass per Recruit (B/R) model analyses showed that P. metaense is over-exploited, as shown by these growth and recruitment descriptors. The current fishing exploitation rate of 0.86 exceeds the Biological Reference Points estimated in 1996 (Emax = 0.58), confirming that the stock of P. metaense in the Apure River is being over-exploited above sustainable levels. The mean size of fish landed in 2003 (Lmean= 64.90 cm TL) shows that fish are being caught below the mean length of sexual maturity (Lm= 62.88 cm TL). Likewise, the fishing mortality rate (F2003= 0.95) was higher than the optimal reference point (Fmsy= 0.95). Actions must be taken to monitor the resource to allow its recovery and the size of the fish at first capture to reach acceptable levels (Lc= 54 cm TL). Keywords: Apure River, Matafraile catfish, overfishing, population dynamics, Venezuela.
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References
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Barbarino, A., D. C. Taphorn, K. O. Winemiller. 1998. Ecology of the coporo, Prochilodus mariae (Characiformes, Prochilo-dontidae), and status of annual migrations in western Venezuela. Environmental Biology of Fishes 53: 33–46.
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Beverton, R.J.H. & S. J Holt. 1957. On the dynamics of exploited fish populations. London: Chapman & Hall, 533 pp.
Buitrago–Suárez, U. A. & B. M. Burr. 2007. Taxonomy of the catfish genus Pseudoplatystoma Bleeker (Siluriformes: Pimelodidae) with recognition of eight species Zootaxa 1512: 1–38.
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Castillo, O. 1988. Aspectos biológicos y pesqueros sobre los peces comerciales del bajo llano con enfasis en los bagres (Orden Siluriformes). Caracas: Universidad Central de Venezuela, 114 pp. [Tesis de MSc]
Charnov, E. L. 1993. Life history invariants: Some explorations of symmetry in evolutionary ecology. Oxford: Oxford University Press, xv + 167 pp.
Charnov, E. L., H. Gislason & J. G. Pope. 2012. Evolutionary assembly rules for fish life histories. Fish and Fisheries 14: 213–224.
Conover, D. A. & S. B. Munch. 2002. Sustaining fisheries yields over evolutionary time scales. Science 297: 94–96.
De Merona, B. 1983. Modele d’estimation rapide de la croissance des poissons. Application aux poissons d’eau douce d’Afrique. Revue d’Hydrobiologie Tropicale 16(1): 103-113.
Duffy, J.E. 2003. Biodiversity loss, trophic skew, and ecosystem functioning. Ecology Letters 6: 680–687.
FAO. 2005. Resumen informativo sobre la pesca por países. Organización de las Naciones Unidas para la Agricultura y la Alimentación. https://www.fao.org/fi/oldsite/FCP/es/ven/profile.htm
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Froese, R., H. Winker, D. Gascuel, U.R. Sumaila & D. Pauly. 2016. Minimizing the impact of fishing. Fish and Fisheries 17(3): 785–802.
Froese, R. & C. Binohlan. 2000. Empirical relationship to estimate asymptotic length at first maturity and length at maximum yield per recruit in fishes with a simple method to evaluate length frequency data. Journal of Fish Biology 56: 758–773.
Froese, R. & C. Binohlan. 2003. Simple methods to obtain preliminary growth estimates for fishes. Journal Applied Ichthyology 19:(6) 376–379.
Froese, R. 2004. Keep it simple: Three indicators to deal with overfishing. Fish and Fisheries 5: 86-91.
Froese, R. 2022. Estimating somatic growth of fishes from maximum age or maturity. Acta Ichthyologica et Piscatoria 52(2): 125–133.
García-Vásquez, A., J.C. Alonso, F. Carvajal, J. Moreau, J. Núñez, J. F. Renno, S. Tello, V. Montreuil & F. Duponchelle. 2009. Life-history characteristics of the large Amazonian migratory catfish Brachyplatystoma rousseauxii in the Iquitos region, Peru. Journal of Fish Biology 75: 2527–2551.
Gislason, H., N. Daan, J. C. Rice & J. G. Pope. 2010. Size, growth, temperature and the natural mortality of marine fish. Fish and Fisheries 11:149–158.
González, A., J. Mendoza, F. Arocha & A. Márquez. 2012. Tasa de explotación y rendimiento sostenible de Pseudoplatystoma fasciatum en el eje Caicara-Cabruta del Orinoco. Zootecnia Tropical 30(2): 155–169.
González, A., J. Mendoza, F. Arocha & A. Márquez. 2017. Estado de explotación del bagre Dorado Brachyplatystoma rousseauxii en el Orinoco medio (Caicara-Cabruta), Venezuela. Zootecnia Tropical 35(3-4): 101–110.
Griffiths, D. & C. Harrod. 2007. Natural mortality, growth parameters, and environmental temperature in fishes revisited. Canadian Journal of Fisheries and Aquatic Sciences 64: 249–255.
Gulland, J. A.1983. Fish stock assessment: A manual of basic methods. New York: John Wiley & Sons, 223 pp.
Hoenig, J. M. 1983. Empirical use of longevity data to estimate mortality rates. Fisheries Bulletin 82: 898–903.
INSOPESCA. 2012. Informe final del programa integral para el ordenamiento de la actividad pesquera en las comunidades de pescadores artesanales, en el eje Orinoco – Apure. Caracas: INSOPESCA, 265 pp.
Machado-Allison, A. & B. Bottini. 2023.Venezuela, República Bolivariana de, pp. 297-340. In: Baigún & Valbo-Jørgensen (eds.). La situación y tendencia de las pesquerías continentales artesanales de América Latina y el Caribe. FAO Documento Técnico de Pesca y Acuicultura N.º 677. Roma: FAO. doi. org/10.4060/cc3839es
Mateus, L. A. F. & M. F. Penha. 2007a. Dinâmica populacional de quatro especies de grandes bagres na bacia do rio Cuiabá, Pantanal Norte, Brasil (Siluriforme, Pimelodidae). Revista Brasileira de Zoologia 24(1): 87–98.
Mateus, L. A. F. & Penha J. M. F. 2007b. Avaliação dos estoques pesqueiros de quatro espécies de grandes bagres (Silurifor- mes, Pimelodidae) na bacia do rio Cuiabá, Pantanal Norte, Brasil, utilizando alguns Pontos de Referência Biológicos. Revista Brasileira de Zoologia 24(1): 144–150.
Mateus, L. A. F. & M. Petrere, Jr. 2004. Age, growth and yield per recruit analysis of the pintado Pseudoplatystoma corruscans (Agassiz, 1829) na bacia do rio Cuibá, Pantanal de Mato Grosso, Brasil. Brazilian Journal Biology 64(2): 257–264.
Novoa, D. 2002. Los recursos pesqueros del eje fluvial Orinoco-Apure: presente y futuro. Caracas: INAPESCA, 148 pp. Novoa, D., F. Cervigón & F. Ramos. 1982. Catálogo de los recursos pesqueros del Delta del Orinoco. pp. 263–386. In: Novoa, D. (comp.). Los recursos pesqueros del río Orinoco y su explotación. Caracas: CVG.
Pauly, D. 1979. Theory and management of Tropical multispecies stocks. A review, with emphasis on the Southeast Asian demersal fisheries. Manila: ICLARM Studies and Reviews, 35 pp.
Pauly, D. 1980. On the interrelationships between natural mortality, growth parameters and mean environmental temperature in 175 fish stocks. Journal du Conseil CIEM 39(3):195–212.
Pauly, D. 1983. Algunos métodos simples para la evaluación de recursos pesqueros tropicales. Documento Técnico de Pesca 234. Roma: FAO, 49 pp.
Pauly, D. & J. Munro. 1984. Once more on growth comparisons in fish and invertebrates. Fishbyte 2: 21.
Peixer, J., A. C. Catella & M. Petrere, Jr. 2007. Yield per recruit of the pacu Piaractus mesopotamicus (Holmberg, 1887) in the pantanal of Mato Grosso do Sul, Brazil. Brazilian Journal of Biology 67(3): 561–567.
Penha, J. & L. A. F. Mateus. 2007. Sustainable harvest of two large predatory catfish in the Cuiabá River basin, northern Pantanal, Brazil. Brazilian Journal Biology 67(1): 81–89.
Pérez, A. & A. Barbarino. 2013. Parámetros poblacionales de los principales recursos pesqueros de la cuenca del río Apure, Venezuela (2000-2003). Latin American Journal Aquatic Re- search 41(3): 447–458.
Petrere, M. Jr., R. B. Barthem, E. A. Córdoba & B. C. Gómez. 2004. Review of the large catfish fisheries in the upper Amazon and the stock depletion of piraiba (Brachyplatystoma filamentosum Lichtenstein). Reviews in Fish Biology and Fisheries 14: 403–414.
Reid, S. 1983. La biología de los bagres rayados Pseudoplatystoma fasciatum y P. tigrinumen la cuenca del río Apure, Venezuela. Revista UNELLEZ de Ciencia y Tecnología 1(1): 13–41. República de Venezuela. 1991. Ministerio de Agricultura y Cría. Resolución MAC Nº 140 del 9 de marzo de 1991. Gaceta Oficial (Caracas) 34710.
Restrepo, V. R. 2009. Red, green and yellow: Thoughts on stock status and the ICCAT Convention objectives. ICCAT Collective Volume of Scientific Papers 64: 2663–73.
Ricker, W. E.1975. Computation and interpretation of biological statistics of fish populations. Bulletin Fisheries Research Board Canadian 191:1–382.
Rochet, M. J.& V. M. Trenkel. 2003. Which community indicators can measure the impact of fishing? A review and proposals. Canadian Journal Fisheries Aquatic Sciences 60(14): 89–90.
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Published
2025-02-07
How to Cite
Pérez, A., & Taphorn, D. C. (2025). Population dynamics of Pseudoplatystoma metaense Buitrago-Suárez & Burr, 2007 (Pisces, Siluriformes: Pimelodidae) from the Northwestern Orinoco River Basin: Dinámica poblacional de Pseudoplatystoma metaense Buitrago-Suárez & Burr, 2007 (Pisces, Siluriformes: Pimelodidae) en la cuenca noroccidental del río Orinoco. Anartia, (39), 9-21. https://doi.org/10.5281/zenodo.14583578
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Artículos
