Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina
The silverside (Odontesthes bonariensis) is the most important species in Argentine fisheries due to its wide distribution, great demand and supply of fish protein. This species shows a great ecological plasticity; however, there is little research describing its tolerance to salinity in natural conditions. Dam constructions for irrigation, hydroelectric generation and human consumption, in synergy with glacial retraction, cause great instability in certain wetlands located downstream. In Curacó chained lakes, in the Desaguadero basin (La Pampa, Argentina), the environments reach high salinity and can even dry out entirely. During the period 2004-2008, a significant increase in water flows in this region modified its chemical characteristics and favored the development of silverside. In October 2009, water stopped entering into the system and, in 2011, many lakes disappeared. The objective of this work was to analyze the survival and fishing yield of O. bonariensis in a context of environmental tolerance due to the gradual surface decrease and the increase of salts concentration in La Brava shallow lake (37°55’24’’ S - 65°55’18’’ W). Water salinity increased progressively from 7.05 to 59.3 g/L and O. bonariensis was present up to a concentration of 49.9 g/L. Fish size evidenced a virgin population with specimens up to 482 mm of LEst and 7 years of age. High catches per unit of effort (CPUE) in number and biomass were observed, with maximums of 375 fish and 204. 6 kg/night, but these did not exhibit a strong linear correlation with saline concentration. The salinity tolerance observed in O. bonariensis is higher than that reported by other authors and places this freshwater fish among the most euryhaline in the world.
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Asociación Argentina de Ecología
2022
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Del Ponti, Omar Mancini, Miguel |
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Del Ponti, Omar Mancini, Miguel Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina |
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Del Ponti, Omar Mancini, Miguel |
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Del Ponti, Omar |
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Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina |
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Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina |
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Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina |
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Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina |
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Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina |
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salinity tolerance and fishing performance of odontesthes bonariensis (actinopterygii; atherinopsidae) in a shallow lake of argentina |
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The silverside (Odontesthes bonariensis) is the most important species in Argentine fisheries due to its wide distribution, great demand and supply of fish protein. This species shows a great ecological plasticity; however, there is little research describing its tolerance to salinity in natural conditions. Dam constructions for irrigation, hydroelectric generation and human consumption, in synergy with glacial retraction, cause great instability in certain wetlands located downstream. In Curacó chained lakes, in the Desaguadero basin (La Pampa, Argentina), the environments reach high salinity and can even dry out entirely. During the period 2004-2008, a significant increase in water flows in this region modified its chemical characteristics and favored the development of silverside. In October 2009, water stopped entering into the system and, in 2011, many lakes disappeared. The objective of this work was to analyze the survival and fishing yield of O. bonariensis in a context of environmental tolerance due to the gradual surface decrease and the increase of salts concentration in La Brava shallow lake (37°55’24’’ S - 65°55’18’’ W). Water salinity increased progressively from 7.05 to 59.3 g/L and O. bonariensis was present up to a concentration of 49.9 g/L. Fish size evidenced a virgin population with specimens up to 482 mm of LEst and 7 years of age. High catches per unit of effort (CPUE) in number and biomass were observed, with maximums of 375 fish and 204. 6 kg/night, but these did not exhibit a strong linear correlation with saline concentration. The salinity tolerance observed in O. bonariensis is higher than that reported by other authors and places this freshwater fish among the most euryhaline in the world. |
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Asociación Argentina de Ecología |
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2022 |
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https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1898 |
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AT delpontiomar salinitytoleranceandfishingperformanceofodontesthesbonariensisactinopterygiiatherinopsidaeinashallowlakeofargentina AT mancinimiguel salinitytoleranceandfishingperformanceofodontesthesbonariensisactinopterygiiatherinopsidaeinashallowlakeofargentina AT delpontiomar toleranciasalinayrendimientopesquerodelpejerreyodontesthesbonariensisactinopterygiiatherinopsidaeenunlagosomerodelaargentina AT mancinimiguel toleranciasalinayrendimientopesquerodelpejerreyodontesthesbonariensisactinopterygiiatherinopsidaeenunlagosomerodelaargentina |
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rev-ecoaus-article-18982023-11-02T16:02:41Z Salinity tolerance and fishing performance of Odontesthes bonariensis (Actinopterygii; Atherinopsidae) in a shallow lake of Argentina Tolerancia salina y rendimiento pesquero del pejerrey Odontesthes bonariensis (Actinopterygii; Atherinopsidae) en un lago somero de la Argentina Del Ponti, Omar Mancini, Miguel silverside salinity tolerance Pampean shallow lake environmental instability pejerrey tolerancia a la salinidad lagunas pampeanas inestabilidad ambiental The silverside (Odontesthes bonariensis) is the most important species in Argentine fisheries due to its wide distribution, great demand and supply of fish protein. This species shows a great ecological plasticity; however, there is little research describing its tolerance to salinity in natural conditions. Dam constructions for irrigation, hydroelectric generation and human consumption, in synergy with glacial retraction, cause great instability in certain wetlands located downstream. In Curacó chained lakes, in the Desaguadero basin (La Pampa, Argentina), the environments reach high salinity and can even dry out entirely. During the period 2004-2008, a significant increase in water flows in this region modified its chemical characteristics and favored the development of silverside. In October 2009, water stopped entering into the system and, in 2011, many lakes disappeared. The objective of this work was to analyze the survival and fishing yield of O. bonariensis in a context of environmental tolerance due to the gradual surface decrease and the increase of salts concentration in La Brava shallow lake (37°55’24’’ S - 65°55’18’’ W). Water salinity increased progressively from 7.05 to 59.3 g/L and O. bonariensis was present up to a concentration of 49.9 g/L. Fish size evidenced a virgin population with specimens up to 482 mm of LEst and 7 years of age. High catches per unit of effort (CPUE) in number and biomass were observed, with maximums of 375 fish and 204. 6 kg/night, but these did not exhibit a strong linear correlation with saline concentration. The salinity tolerance observed in O. bonariensis is higher than that reported by other authors and places this freshwater fish among the most euryhaline in the world. El pejerrey —Odontesthes bonariensis (Actinopterygii; Atherinopsidae)— es la especie más importante en las pesquerías de la Argentina por su amplia distribución, gran demanda y aporte de proteína. A pesar de presentar una gran plasticidad ecológica, existen muy pocos antecedentes bibliográficos que describan la tolerancia del pejerrey a la salinidad en condiciones naturales. La construcción de presas para regadío, generación hidroeléctrica y consumo humano, en sinergia con la retracción glaciaria, produce gran inestabilidad en humedales ubicados aguas abajo. En las lagunas encadenadas del Curacó, en la cuenca del Desaguadero (La Pampa, Argentina), los ambientes alcanzan una salinidad elevada e, incluso, se pueden secar totalmente. En esta región, durante el período 2004-2008 hubo un incremento de los flujos de agua que modificaron sus características químicas y favorecieron el desarrollo de pejerrey. En octubre de 2009 dejó de ingresar agua al sistema y, en 2011, muchas lagunas desaparecieron. El objetivo de este trabajo fue analizar la sobrevida y el rendimiento pesquero de O. bonariensis en un contexto de tolerancia ambiental debido a la disminución gradual de la superficie y el aumento de la concentración de sales de la laguna La Brava (37°55’24’’ S - 65°55’18’’ O). La salinidad del agua aumentó progresivamente de 7.05 a 59.3 g/L, y O. bonariensis estuvo presente hasta una concentración de 49.9 g/L. La talla de los peces evidenció una población virgen con ejemplares de hasta 482 mm de LEst y 7 años de edad. Se observaron elevadas capturas por unidad de esfuerzo (CPUE) en número y biomasa, con máximos de 375 peces y 204.6 kg/noche; no obstante, las capturas no exhibieron una correlación lineal fuerte con la concentración salina. La tolerancia salina observada en O. bonariensis es superior a la reportada por otros autores y ubica a esta especie de agua dulce entre las más eurihalinas del mundo. Asociación Argentina de Ecología 2022-11-15 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Artículos application/pdf https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1898 10.25260/EA.22.32.2.0.1898 Ecología Austral; Vol. 32 No. 2 (2022): August 2022. Pages 297-598; 581-593 Ecología Austral; Vol. 32 Núm. 2 (2022): August 2022. Pages 297-598; 581-593 0327-5477 1667-7838 spa https://ojs.ecologiaaustral.com.ar/index.php/Ecologia_Austral/article/view/1898/1309 Derechos de autor 2022 Omar Del Ponti, Miguel Mancini https://creativecommons.org/licenses/by/3.0/ |