Abstract
Floating net cage activities can cause water quality to decrease. The feed remains and the metabolism of the fish from these activities produces nitrogen and phosphorus . The objective of this study is to obtain the calculation model and the amount of phosphorus released into the waters of Laut Tawar Lake as a result of floating cage activities. The resulting formula was Pw = (F x [P]p) – ((It – Io) x [P]i), where their variables were given feed (F), phosphorus concentration of feed ([P]p), the final weight of fish (It), the initial weight of fish (Io), and phosphorus concentration in fishes ([P]i). It can be used to predict the increase in phosphorus waste based on the increase in floating net cage area. The weight of tilapia increases exponentially with the day of cultivation in the equation Y = 12.70e0.02x and the goldfish followed the formula Y = 2.28e0.03x. Phosphorus in tilapia varies from 1.58% to 2.23% with an average of 1.97%. Goldfish contain 1.19 - 2.02% phosphorus, with an average of 1.52%. Goldfish growth was not optimal due to inadequate feeding, so without excessive feeding and did not generate phosphorus waste. The cultivation of tilapia releases 0.09 Kg P/m2 of phosphorus waste from floating cages .
Highlights
Floating net cage activities can cause water quality to decrease
the amount of phosphorus released into the waters of Laut Tawar Lake
It can be used to predict the increase in phosphorus waste based on the increase
Summary
Floating net cage activities can cause water quality to decrease. The feed remains and the metabolism of the fish from these activities produces nitrogen and phosphorus. Berdasarkan total luas dan jumlah petakan KJA budidaya ikan nila diperoleh nilai rata-rata padat tebar benih sebesar 384 ekor/m2. Jumlah pemberian pakan ikan nila di KJA Danau Laut Tawar diobservasi pada 83 petakan dengan total luas areal 1834 m2.
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