Lutjanus synagris (Acanthuriformes: Lutjanidae): reproductive biology and synchronization with lunar phases in the Gulf of Salamanca, Colombian Caribbean
DOI:
https://doi.org/10.15517/rev.biol.trop..v73i1.60355Keywords:
biorhythms; condition factor; gonadosomatic index; tropical fishes.Abstract
Introduction: Lutjanus synagris is one of the most common demersal fishes in the Colombian Caribbean and is of interest to artisanal fisheries, although in decline. The study of its reproductive patterns provides insight into its biology relevant to the general study of tropical fishes.
Objective: To assess the condition factor and gonadosomatic index, to determine the monthly incidence of mature fish, to estimate the mean length at sexual maturity (Lm), and to explore predictors affecting the condition factor and gonadosomatic index in the lane snapper L. synagris.
Methods: Extirpated gonads of males and females were classified according to their maturity status and related to fish length. The condition factor and gonadosomatic index were estimated according to standard formulae. Their dependency on variables related to climate, geographic space, and behavior were assessed using linear models.
Results: Condition factor was stable throughout the year, while the gonadosomatic index showed an increasing pattern from the first months of the year (dry season), reaching a peak in the second semester of the year. The incidence of mature fish was higher in about the same months as when the gonadosomatic index showed high values. An Lm of 26 cm total length was estimated for both sexes, 27 cm for males and 25 cm for females. Condition factor and gonadosomatic index were associated with several predictors, notably with moon phases.
Conclusion: A spatial and temporal signal for the reproductive patterns of L. synagris was found but decoupled from climate seasonality. The reproductive rhythm of L. synagris was related to moon phases as the main environmental cue.
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