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Abstrak Limnological Condition And Estimation of Potential Fish Production of Kerinci Lake Jambi, Sumatra

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,Samuel,Ni Komang Suryati,Vipen Adiansyah,

Kerinci  Lake  is  a type  of tectonic  lakes  located  in  a protected  forest  area  of National  Park  of Kerinci  Sebelat  and a source  of various  fish  species  important  for local  people  for their daily food comsumption  and  income.  However,  few information  ls  available  on its  limnological  condition  and fish  resources.  Field  research  observing the  limnological  condition  and  estimating  the potential fish  production  was conducted  four times in April,  June, August and October  2013.  The research  is aimed  to  describe  the  condition  of limnology  to estimate  the  potential  fish  production  of the  lake. Limnological aspect included the physico-chemical and biological parameters, namely: temperature, water  transparency,  depth,  substrate,  conductivity,  pH, dissolved oxygen,  alkalinity, ammonia,  nitrate,  phosphate,  total  phosphorus,  chlorophyll-a  and  trophic  state.  Potential  fish production was calculated  by  using  the  biological parameter levels  of  chlorophyll-a.  The results show that the euphotic  layer of the lake waters was still feasible for fish life. Water condition of the bottom layer was less  supportable  for fish  life  due  to  low  dissolved  oxygen content.  Trophic state index (TSI) values, either measured  by temporal or spatial ways, had TSI with an average of 61. 75. From these indeces, the lake is classified  as a lake at the high productivity level (eutrophic). Annual fish production was an average of 307 kg/ha/year. By taking account the average of fish production and the total  area  of lake of around 4,200  ha, the  potential fish  production of Kerinci  Lake  is estimated  about  ± 1,287  tons/year.

Keywords :  Water quality,  trophic state,  potential  fish production,  Kerinci  Lake of Jambi, Sumatra