Influence of larval and juvenile life history on age at first maturity in two tropical amphidromous fish species - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Ecology of Freshwater Fish Year : 2020

Influence of larval and juvenile life history on age at first maturity in two tropical amphidromous fish species

Abstract

This study investigates how age at first maturity of two tropical amphidromous spe‐cies Sicyopterus lagocephalus (Pallas, 1770) and Cotylopus acutipinnis (Guichenot, 1863) varies in relation to their larval and juvenile life history. Reproductive stage was estimated based on histological observation of ovaries of more than 200 females of each species caught monthly over 1 year. The age of fish was estimated by interpret‐ing the daily increments deposited on otoliths during the oceanic larval phase, and the juvenile phase in the river. The age at first maturity was approximately 9 months for S. lagocephalus and 7 months for C. acutipinnis, corresponding to approximately 70–130 and 90–130 days after they returned to freshwater respectively. For both species, the time spent in freshwater before maturity was significantly influenced by the duration of the pelagic larval stage at sea (PLD) and the season of return in freshwater. Individuals with a long PLD, or returning in freshwater during the warmer season, maturated faster once in freshwater. This reproductive advantage may mini‐mise the risk of extirpation due to catastrophic events at each generation and thus probably benefits amphidromous species living in very unpredictable tropical rivers.
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Dates and versions

hal-02291840 , version 1 (19-09-2019)

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Raphaël Lagarde, Nils Teichert, Henri Grondin, Thomas Hue, Philippe Gaudin, et al.. Influence of larval and juvenile life history on age at first maturity in two tropical amphidromous fish species. Ecology of Freshwater Fish, 2020, 29 (1), pp.63-73. ⟨10.1111/eff.12488⟩. ⟨hal-02291840⟩
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