Diverse environmental cues drive the size of reproductive aggregation in a rheophilic fish.

Both models were highly significant and explained around 50% data variability in the size of reproductive aggregations of both males and females.

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In our dataset, the possibility that largest reproductive aggregations occurs at night because of predation due to low light levels is also supported by the effects of lunar phase, which showed a trend of decreasing the size of reproductive aggregations during full moon), suggesting an optimization of the fish behaviour in the sense of “to see and not to be seen”.

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