The Spawning Period of Anadara granosa (Bivalvia: Arcidae) Population in the Lhokseumawe Mudflat

Khalil, Munawar (2015) The Spawning Period of Anadara granosa (Bivalvia: Arcidae) Population in the Lhokseumawe Mudflat. In: Proceedings of International Seminar on Biological Sciences, 17 October 2015, North Sumatera, Medan Indonesia.

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Abstract

This study determined the spawning period of blood cockle Anadara granosa and correlation to environmental condition. The condition index (CI) analysis was conducted to evaluating the spawning period of the cockle population. Samples were collected from July 2009 until September 2010 at Lhokseumawe tidal mudflat, whereas environmental parameters were measured periodically. The highest CI was observed in September 2010 (CI: 14.15±3.14), while the lowest CI was found in January 2010 (CI: 6.76±1.13). The results indicated that the spawning period and recruitment in the cockle population at Lhokseumawe are dependent on local environment conditions. A. granosa spawned was dribble or throughout the year (peaked from November 2009 to January 2010). The released gamete in A. granosa was coincided with drastic fluctuations in environmental condition. This research found that the water temperature and salinities were the leading triggers of reproductive events. Keywords: Reproductive biology, Blood cockle, Water quality

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