Migration to freshwater increases growth rates in a facultatively catadromous tropical fish

Brien H. Roberts, John R. Morrongiello, Alison J. King, David L. Morgan, Thor M. Saunders, Jon Woodhead, David A. Crook

    Research output: Contribution to journalArticle

    Abstract

    Diadromy is a form of migration where aquatic organisms undergo regular movements between fresh and marine waters for the purposes of feeding and reproduction. Despite having arisen in independent lineages of fish, gastropod molluscs and crustaceans, the evolutionary drivers of diadromous migration remain contentious. We test a key aspect of the ‘productivity hypothesis’, which proposes that diadromy arises in response to primary productivity differentials between marine and freshwater habitats. Otolith chemistry and biochronology data are analysed in a facultatively catadromous tropical fish (barramundi, Lates calcarifer) to determine the effect of freshwater residence on growth rates. Individuals that accessed freshwater grew ~ 25% faster on average than estuarine residents in the year following migration, suggesting that catadromy provides a potential fitness advantage over non-catadromous (marine/estuarine) life histories, as predicted by the productivity hypothesis. Although diadromous barramundi exhibited faster growth than non-diadromous fish, we suggest that the relative reproductive success of diadromous and non-diadromous contingents is likely to be strongly influenced by local environmental variability such as temporal differences in river discharge, and that this may facilitate the persistence of diverse life history strategies within populations.

    Original languageEnglish
    Pages (from-to)253-260
    Number of pages8
    JournalOecologia
    Volume191
    Issue number2
    Early online date6 Jul 2019
    DOIs
    Publication statusPublished - Oct 2019

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