Fighting fish (Betta sp.) is endemic fresh water fish of Southeast Asia that has become one of Indonesias export commodities. Male fighting fish has brighter colour then the female. Mono-sexual male fighting fish population can be obtained through sex reversal method (female to male). However, male fighting fish suspected sex reversal results will likely have a low color intensity. This study aims to determine the effect of sex reversal using 17α-methyltestosterone hormone toward colour intensity of male fighting fish with XX genotype as the results of sex reversal and the original male fighting fish XY genotype. The research design consisted of 2 treatments with 3 replications. The determination of the observations grade toward the colour intensity of fighting fish is done by comparing the original colour of the fish using coloured paper Modified Toka Colour Finder (M-TCF) which were observed by 5 observers for the accuracy of the data. The results showed that there is significant effect of sex reversal using 17α-methyltestosterone hormone toward the colour intensity of the male fighting fish XX to XY males. On the whole, the mean observed colour intensity for P1 (with sex reversal) is 18.33 and P2 (without sex reversal) is 28.33, it shows that the P1 has lower brightness than P2.
Biofloc system is a technology in aquaculture which utilized waste mainly in form of anorganic nitrogen. The anorganic nitrogen will be converted into protein in the form of bacterial biomass by heterotrophic bacteria. The growth of heterotrophic bacteria is stimulated by the addition of a carbon source. This research aimed were to study the absolute growth, daily growth rate, specific growth rate and survival rate of tilapia and sangkuriang catfish which fed on biofloc. The research used Completely Randomized Design (CRD) which consisted of two treatments and four replication. The study lasted for 40 days, with the frequency of feeding biofloc was three times a day ie morning, afternoon and evening. Growth sampling was done every 10 days, observation of water quality every 8 days, and ammonia test was done at the beginning, middle and end of research. The results showed that tilapia which fed on biofloc have absolute growth, daily growth rate, specific growth rate, and survival rate better than those of sangkuriang catfish.
Indonesia is an archipelago country with potential marine and coastal. Simeulue Island, NAD is one of the leading island in west of the Republic of Indonesia and located in Hindia Ocean. Simeulue have potential marine waters such as ﬁsh, lobster, crab and sea cucumber as well as ecosystems such as coral reefs and mangroves. Simeulue is an area that aﬀected by the tsunami or Smong (in local term means running) at eleven years ago on 26 December 2004. A big change that happen is the accretion on most coasts such as in the area around the northwest to the northeast. This accretion marked by the widening of the coast towards the sea and the lifting of the corals to the surface because ofthe movement of tectonic plate subduction Sunda arc (Natawidjaja, 2007). This study aims to determine the condition of the water quality and the potential suitability of a marine tourism in this region to foreign countries. Location of study at Ganting Beach, Village of Kuala Makmur, Simeulue regency, Simeulue Island. The research was conducted in August 2015. The number of sampling station is 12 points with purposive sampling method. Observation of water quality parameters are pH, temperature,salinity, turbidity, dissolved oxygen, brightness, BOD5, odors, oil and debris. These parameters are then mapped using software ODV, analyzed and compared with the sea water quality standard for marine tourism as well as the characteristics of the coast to the suitability index of recreational area. Water quality parameters showed pH values ranged from 10.05 to 10.25; temperature from 29.80 to 31.90 (° C); salinity from 27.60 to 32.70 (ppt); turbidity from 0.00 to 3.50 (NTU); dissolved oxygen from 7.46 to 8.77 (mg / L); BOD5 from 0.897 to 1.076 (mg/ L); brightness 8.50 to 15.40 (m); no smell; no oil layer; and no debris. The results showed that the water quality P. Ganting is very suitable for recreational activities (index 77, category S1) and it is suitable for swimming and also for boating tourism activities, banana boats and jet skis (index 16, category S2).
Green mussel (Perna viridis) is oyster has high potential to be developed. A huge market demand is an important factor to optimized green mussel cultivation, there are to system that could be applied for cultivation green mussel is polyculture and monoculture. The purposed of this study is to determined growth performance of green mussel which culture in monoculture and polyculture system. Green mussel is culture in floating cage bath of monoculture and polyculture system. In polyculture system green mussel placed within seabass (Lates calcarifer). Growth performance of green mussel determined by comparizing growth in wide and body lenght using T-test to analyzed factor that assigned to growth performance used principle component analysis (PCA) to environment factor such as Total Amonia Nitrogen (TAN), Total Organic Matters (TOM), Total Suspended Solid (TSS) and phytoplankton both in polycultured and monocultured system. The result of this research was shown that growth in this significant shown from third place where sample collected at 0-100 in depth The results showed that this significant growth was shown from the third place where the samples were collected at 0-100 in depth and the second place where the samples were collected at 100-150 in depth. This is caused by availability of feed source such as TOM and phytoplankton thy driven by sea current. The significant value shown by growth in wide of mussel shell at 100-150 cm in depth.
Polychaeta is one of many organisms associated to seagrass bed. To grow optimally, polychaeta needs habitat that suitable to its habit and feeding behaviour. This research aims to analyze polychaetahabitat suitability on seagrass ecosystem at Parang Island, Karimunjawa. The research was held on September 2012, at Parang Island, Karimunjawa. The result shows that the seagrass bed is a mixed community type consisted of 7 seagrass species, and 12 kindsof polychaeta which Spionidae is the highest in abundance (141 ind.m-2). The result of Principal Component Analysis (PCA) indicates that polychaeta abundance was aﬀected by some factors, i.e; organic material of substrate, graveled and muddy substrate, dissolved oxygen, depth, nitrate concentration, zooplankton, and seagrass percent cover.
The aims of this study is to determine the diversity and condition of coral reef ecosystems in the island of Lahu Besar, Ringgung. Some parameters were observed are percent cover and condition of coral reefs, composition and density of coral species, and water quality include salinity, temperature, clarity, waters current, pH, and sedimentation. The surface temperature at the time of observation average of 30-31 oC and salinity of sea water an average of 32 - 34 o/oo. The clarity in the study area is 5 meters. Distribution of reefs founded in the Lahu Besar bay to ± 10 m in depth. The substrate dominated by sand and dead coral. The Percent cover of live coral is about 10.5 to 52.9%. The other form of covered substrate consist of Enhalus acoides, Sargassum echinocarpum andHalimeda micronesica. The results showed that the density of the dominant species of coral stones at each station is about 0.1 to0.63 ind / m. The coral reef was dominated in Station I was kind of Acropora nobilis, Station II is Montipora ﬂorida, and Station III is Acropora nobilis and Acropora formosa. Diversity index values obtained at each station is about 0.80 to 1.68.