Abstract
The tailing pond of bauxite post-mining in Senggarang, Tanjungpinang City, have been potency of natural feed sources from phytoplankton and zooplankton. Moreover, the water quality of the tailing pond of bauxite post-mining has begun to support fish life. The objective of this study was to determine the survival rate and growth of economical fish in tailings ponds of bauxite post-mining in Senggarang, Tanjungpinang. The research was conducted by field experiment using a completely randomized design. There were different fish varieties as treatment: tilapia (Oreochromis niloticus), gouramy (Osphronemus gouramy), and tambaqui (Colossoma macropomum). Every treatment was carried out 5 replications, with 6 fish in every cage replication. Monitoring the water quality and the fish survival on the 0th, 10th, 20th and 30th days. The survival of economical fishes in tailing ponds of bauxite post-mining from the highest to lowest were tambaqui (97%), tilapia (83%), and gouramy (40%), respectively. The growth of fishes length from the highest to the lowest were gouramy (0,223 cm), tambaqui (0,037 cm), and tilapia (0,018 cm). Meanwhile, all variety of fish tested had a decreased in weigh: gouramy -0,2310 grams, tilapia -0,4281 grams, and tambaqui -1,3498 grams. The management of tailing ponds of bauxite post-mining in Senggarang for fisheries activities can be carried out by tambaqui (C. macropomum) culture cage with several conditions such as measurement of carrying capacity and capacity, management of water quality, feed, and technical aspects of culture.Keywords: bauxite, economical fish, growth, survival rate, tailing ponds
Highlights
Bintan Island is one of the bauxite producers in Indonesia
Survival rate and growth observation were carried out in tailing ponds of bauxite postmining in Senggarang Besar, Senggarang Village, Tanjungpinang Kota District, Tanjungpinang City, Riau Islands Province (Figure 1)
The results of one way ANOVA analysis obtained the results of F count> F table. This mean that there is a significant effect on differences of fish species to fish survival rates in tailing ponds of bauxite post-mining
Summary
Bintan Island is one of the bauxite producers in Indonesia. According to Rohmana et al (2007), bauxite mining in Bintan Island started in 1935, and was closed in 2009 (Ministry of ESDM, 2012). One of the bauxite mining activities in Bintan Island has stopped, located at Senggarang Village, Tanjungpinang City. The bauxite mining activity that has stopped would leave the abandoned bauxite mining pits. The remaining washing of bauxite and overflow of rainwater could became a new aquatic ecosystem, called tailing pond. According to Puspita et al (2005), the water of post-mining ponds can not be used directly, because it was contained high pollutants. The water of post-mining ponds will be the natural ecosystem likely, depends on the age of the ponds (innudated time). Pond mining could beused for various activities, such as fisheries activities
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