Monthly Archives: July 2020

Abstract

Yusuf R, Tang UM, Karnila R, Fuadi I, Pato U. 2020. Ecological sustainability of rice farms in Siak District, Riau, Indonesia. Biodiversitas 21: 3797-3804. The research was conducted in Siak District, Riau Province, Indonesia from January to July 2018 in the four subdistricts of rice production centers. The purpose of this study was to identify the ecological conditions of rice farming, analyze the index and ecological sustainability status of lowland rice farming, and analyze the role of each ecological attribute that will have sensitivity to the management of wetland rice in the development of rice farming in the Siak District in the near future. There were 203 sample farmers selected by purposive sampling. Data collection was done by interview and field observation. The sustainability was analyzed using the Rap-Rice method with Multidimensional Scaling (MDS). The results of the Rap-Rice analysis of eight ecological attributes were analyzed; five attributes provided high sensitivity for Sungai Mandau, and three attributes provided high sensitivity for the subdistricts of Bunga Raya, Sabak Auh, and Sungai Apit. Attributes that provided high sensitivity for all subdistricts were attributes of land suitability with land use plans and land conversion rates. The average attributes of ownership of the farm area provided high sensitivity for only three subdistricts (Sabak Auh, Sungai Apit, Sungai Mandau) . Based on ecological conditions, analysis of wetland rice farming in Siak District showed a sustainable category for Bunga Raya (56.10%), Sabak Auh (52.80%), and Sungai Mandau (54.90%) and less sustainability for Sungai Apit (48.80%).

Keywords: Analysis of sustainability, ecology, farming, lowland rice

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Kunjungi Jurnal Biodiversitas

Abstract. Silver pompano (Trachinotus blochii) has received tremendous attention from the aquaculture sector, due to its favourable features, such as a high economic value, its good adaptive response and its potential to be cultured in various salinities. The aim of this study was to discover the effects of medium salinities on osmotic performance rate, blood cortisol, and growth performance (absolute growth weight and lenght, specific growth rate (SGR), feed conversion (FC), feed efficiency (FE), survival rate (SR)) of T. blochii under recirculating system. The histological alterations (kidney and gill) and water quality (temperature, pH, DO, NH3, NO2 and NO3) were also observed. The 56-day experiment was carried out in Balai Perikanan Budidaya Laut (BPBL) of Batam, Indonesia. A total of 300 fish specimens (11-13 cm in length, weighing 28-29 g) were raised in a 100 L tank containing 80 L of water at a density of 1 fish 4 L-1 (20 fish in total). They were fed with commercial pellet (46% protein) at 3% of fish biomass and 3 times a day. The experiment was conducted according to a completely randomized design with 5 levels of salinity: P1=25‰, P2=20‰, P3=15‰, P4=10‰ and P5=5‰, by performing triplicate measurements for each treatment. The treatment with 15 ‰ salinity showed the best effects, yielding an osmotic performance rate of 3 mOsm L-1 H2O, a blood cortisol level of 50,923 nmol L-1, an absolute growth weight and  length  of  17.73±1.25  g  and  2.32±0.21  cm, respectively,  an  SGR  of  0.87±0.05%,  an FC  of

1.24±0.00, an FE of 80.79±0.58 and an SR of 88.33±2.88%. Histologically, there were no anomalies in the structure of gill and kidney of the fish cultured in 5‰-25‰ salinities. Water quality was acceptable for growing T. blochii.

Key Words: gill, kidney, blood cortisol, histology, water quality.

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