International Journal of Sciences: Basic and Applied Research (IJSBAR) ISSN 2307-4531 (Print & Online) http://gssrr.org/index.php?journal=JournalOfBasicAndApplied --------------------------------------------------------------------------------------------------------------------------- Growth and Exploitation Rate of the Bombay Duck (Harpodon Nehereus Hamilton, 1822) (Fish: Synodontidae) in Tarakan Island Waters, Indonesia Asbar Laga a* , Ridwan Affandi b , Ismudi Muchsin c , M. Mukhlis Kamal d . a Student of Departement of Aquatic Resource Management , Fisheries and Marine Faculty, Bogor Agriculture University, Agatis Street, Bogor, 16680 b,c,d Departement of Aquatic Resource Management , Fisheries and Marine Faculty, Bogor Agriculture University, Agatis Street, Bogor, 16680 a Email: asbar.ubt05@gmail.com b Email :affandi_ridwan@yahoo.com c Email : ismudi2011@yahoo.co.id d Email :m_mukhliskamal@yahoo.com Abstract The Bombay duck (Harpodon nehereus) is an economically important fish inhabiting Tarakan waters of North Kalimantan Province. Unless an appropriate management performed, an ever increasing in exploitation of this synodontid species will threat its population sustainability. A research was conducted from March 2013 to February 2014 in Tarakan waters aiming to investigate on growth and exploitation rate of the Bombay duck. Three sampling sites were determined for the purpose of sample collection. Fish was collected by a trawl of 1: 2: 2 cm in mesh size, towed for 30 minutes at each sub-station. On board, approximately 50 individual fishes of various size were randomly collected. In total, 1051 fishes were collected consisting of 544 males and 507 females. Data of length-weight relationships was used in analyzing individual growth, whereas length was for length frequency distribution in order to calculate population growth. The results showed that the Bombay duck growth was allometrically negative in station 2 and 3, whereas isometric in station 1. ------------------------------------------------------------------------ * Corresponding author. E-mail address: asbar.ubt05@gmail.com 341