Journal article Open Access

A study into parental assignment of the communal spawning protogynous hermaphrodite, giant grouper (Epinephelus lanceolatus)

Bright, David; Reynolds, Adam; Nguyen, Nguyen H.; Knuckey, Richard; Knibb, Wayne; Elizur, Abigail


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    <subfield code="a">Parental contributions of giant grouper to communal spawns in captivity is important
for establishing genetic management of the species. In this study, we have followed
the spawning dynamics of three males and three females over 6-8 consecutive days,
over three time periods. Polymorphic microsatellite markers were validated and
utilised to successfully determine parentage in 574 offspring from 20 nights of
spawns. Variation of both maternal and paternal contributions between nights in
batches of spawns were significant (P &amp;lt; 0.001). Most paternal assignments were
attributed to one dominant male who initiated each spawning batch, however, all
males and females successfully mated over the spawning period. There was a
significant (P &amp;lt; 0.01) trend towards a polygamous reproductive mode for giant
grouper: in two of the three batches of spawns where, on some nights, eggs from all
females were fertilised by multiple males. Genetic variation was assessed between
parents and offspring. There was a loss of alleles on each spawning night, however,
if offspring from a series of consecutive nights were combined, most or all of the
genetic variation would be maintained in the F1 generation. This research validates
the molecular tools for genetic monitoring of giant grouper and also improves the
understanding of spawning dynamics of protogynous hermaphroditic communal
spawners over time in an aquaculture setting.</subfield>
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    <subfield code="a">Reynolds, Adam</subfield>
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    <subfield code="a">Knuckey, Richard</subfield>
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    <subfield code="a">10.1016/j.aquaculture.2016.03.013</subfield>
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    <subfield code="a">A study into parental assignment of the communal spawning protogynous hermaphrodite, giant grouper (Epinephelus lanceolatus)</subfield>
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