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aqua 14(1)_Chromis viridis

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Volume 14, Issue 1 – 28 January 2008

Kathleen S. Cole: Observations on spawning behavior and periodicity in the Bluegreen Chromis (Pomacentridae: Chromis viridis), in Madang Lagoon, Papua New Guinea, pp. 27-34

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SINGLE PAPER

Volume 14, Issue 1 – 28 January 2008

Kathleen S. Cole: Observations on spawning behavior and periodicity in the Bluegreen Chromis (Pomacentridae: Chromis viridis), in Madang Lagoon, Papua New Guinea, pp. 27-34

Abstract

Two populations of the schooling zooplanktivore, Chromis viridis (Teleostei: Pomacentridae), observed in Madang Lagoon, Papua New Guinea, exhibited a high degree of localized spawning synchrony. The reproductive activities associated with synchronized spawning fell into three distinct phases, including an initial aggregation phase, a subsequent spawning phase, and a final embryo-guarding phase. These activities lasted a total of five days at each site. The aggregation-spawning sequence was closely associated with a semi-lunar cycle at the time of the new and full moon, indicating that lunar cues are used to generally synchronize activities among interacting individuals at a particular site. However, the time of spawning for Wongad and Tab populations were not precisely coincident. This absence of temporal alignment in two, relatively closely situated C. viridis populations indicates that more localized, possibly site-specific, cues determine the fine-scale timing for the onset of the reproductive sequence.

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