| dc.description.abstract | Catfish is one of the freshwater fishery commodities whose demand is
increasing in Indonesia. Intensive cultivation is required to meet the market
demand. Intensive cultivation can be done by optimizing the stocking density.
This study aimed to determine the effect of added Nitrobacter with high stocking
density system on the survival, height growth and weight growth of catfish
(Clarias sp.) As well as to determine the maximum stocking density of catfish
with the average length of 6 cm and 1.5 gram in average weight. 450 catfish were
used. The study was conducted at Laboratory of Aquaculture, Water Resource
Management, Faculty of Agriculture, University of Sumatera Utara, Medan in
June until July 2016. The container were used are 9 aquarium size of 60 cm x 40
cm x 40 cm with a volume of 72 liters each aquarium. The parameters were
observed during 42 days of observation are; survival, weight growth and length
growth. During the study, fish were fed with artificial feed as much as 5% of body
weight per day. The feeding frequency are 3 times a day which are at 10:00,
14:00, 18:00. This study used completely randomized design (CRD) with 3
treatments, those are stocking density of 600 individuals / liter (P1), 700 fish / liter
(P2) and 800 fish / liter (P3) and repeated 3 times. The P1 treatment showed the
best score at weight growth rate and length growth rate in the amount of 40,70
gram and 12,63 cm. The P3 treatment showed the lowest weight growth rate and
length growth rate that is equal to 38,74 gram and 12,18 cm. Stocking density did
not significantly affected the length growth rate, weight growth rate and survival
of fish. | en_US |
