Analisa Limbah Fosfor Kegiatan Keramba Jaring Apung di Danau Laut Tawar Aceh Tengah

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 .

Influence of Rainfall and Spatial Temporal Distribution Analysis of Total Suspended Solid in Laut Tawar Lake

“…The highest TSS obtained at Station 2 shows the influence of floating net cage cultivation activities, unconsumed feed, and other waste [5]. Likewise, for other stations, it certainly has a correlation with TSS obtained from the catchment area.…”

“…In the waters of Laut Tawar Lake were found 26 species of fish, including endemic fish species, namely Depik (Rasbora Tawarensis), Eyas (Rasbora sp), and Kawan (Poropuntius Tawarensis) [2,3,4]. This lake plays an important role as one of the economic resources for the community around the lake through capture fisheries [4] and floating net cage aquaculture [5].…”

“…The community's dependence on Laut Tawar Lake shows that the lake has an important role that must be managed optimally. The lake has the functions an important ecologically, economically, health, and aesthetic [5], so its management is crucial to improve the community welfare [6]. On the other hand, Laut Tawar Lake experiences environmental pressures in the form of increased anthropogenic activities and intensification resource utilization in catchment areas and waters [3,7].…”