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Abstrak Grpwth, Mortality and Exploitation Rate of Nile Tilapia Fish (Oreochromis niloticus) at Lake Batur, Bali

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,Samuel,Ni Komang Suryati,

A  study  that  was  aimed  to  determine  the  parameters  of  the  growth,  mortality  and exploitation  rate  of nile  tilapla (Oreochromis  niloticus)  were  conducted  at  Lake Batur,  Bali from March to November 2011.  The study based on a survey with the flsh sample was obtained  from the fish catch of fishermen using gillnet with mesh size between  1.0 to 4.0 inches.  Hile tilapia fish population in Lake Batur was daminated by individual lengths between 18.5 to 22.5 cm with a frequency of 50% and from 23.5 to 27.5 cm by 23%.  The dominant pattern of growth was isometric.  The results of the parameter analysis of nile tilapia populations using the FISAT program pakage showed that the asymptotic length/ infinitif length (L≈) reached 41.45 cm  and the growth coeffident (K) = 0.52 per year.  Growth performance (Ø) = 3.013,  the natural mortality rate (M) of 0. 9586 per year, the mortality rate from fishing (F) of  1. 1014 per year and the total mortality rate  (Z) was at 2.06 per year so the exploitation rate of nlle  tllapla populations (E) was at 0.535.  The nile tilapia in Lake Batur could spawned more than once In a year with peak spawning season accured around March, August and September.

Keywords : Growth, mortality, exploitation rate, nlle tllapla,  Lake Batur .