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Opportunistic spawning of tropical anguillid eels Anguilla bicolor bicolor and A. bengalensis bengalensis
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Opportunistic spawning of tropical anguillid eels Anguilla bicolor bicolor and A. bengalensis bengalensis
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Journal Article
Opportunistic spawning of tropical anguillid eels Anguilla bicolor bicolor and A. bengalensis bengalensis
2017
Overview
Information on the spawning migration, spawning ecology and life history of tropical eels in the Indo-Pacific region is very limited. The physiological and morphological characteristics of tropical freshwater eels,
Anguilla bicolor bicolor
and
A. bengalensis bengalensis
collected in Malaysia were examined in relation to their downstream migration patterns. A total of 455 eels were collected over monthly intervals between February 2014 and January 2016 and we examined both gonadosomatic index and gonad histology features. In both species, close positive relationships between advanced maturation stages and eye, fin, gonadosomatic indexes were found in males and females.
A. bengalensis bengalensis
was found to be larger and heavier than
A. bicolor bicolor
at the time of seaward migration. The final stage of maturation for seaward spawning migration occurred throughout the year in
A. bicolor bicolor
, although that of
A. bengalensis bengalensis
was estimated to six months due to the limited number of samples. These results suggest that year-round spawning in the open ocean occurs in the tropical eel. This non-seasonal spawning ecology is notably different from that of temperate eels, which are known to follow a well-defined spawning season, with spawning migrations generally taking place during autumn months.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
