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SURVIVAL AND RESPONSE MOLTING OF MUD CRAB (Scylla olivacea) INJECTED WITH MURBEY (Morus spp.) LEAVE EXTRACT

Jurnal Ilmu dan Teknologi Kelautan Tropis Vol 7, No 1 (2015): Elektronik Jurnal Ilmu dan Teknologi Kelautan Tropis
Publisher : Jurnal Ilmu dan Teknologi Kelautan Tropis

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Abstract

The soft shell crab productivity has been hampered due to the long rearing time and unsimultaneous molting of the crab. This study aimed to determine the effect of murbey (Morus spp.) leave extract as molting stimulant on Scylla olivacea and its best extract dosage to be applied in soft shell crabs production technology. Application of murbey extract was conducted by using injection method with 5 treatments such as (a) 0 ppm (as control); (b) 100 ppm; (c) 125 ppm; and (d) 150 ppm for 12 individual per treatment. The results showed that the highest molting percentage (50%) was obtained at the concentration of 100 ppm. Meanwhile, the control (0 ppm), 125 ppm, and 150 ppm treatments displayed the same molting response (33.3%). The fastest latent molting time (29 days) was found at the treatment of  125 ppm and the slowest one of 44 days at  100 and 150 ppm treatments. The best growth of crabs injected with murbey leaves extract was at the concentration of 100 ppm with the carapace width of 6.0 mm and the body weight of 32.98 g, while the lowest was obtained at the concentration of 150 ppm with the carapace width of 3.8 mm and the body weight of 25.43 g. Crabs treated with murbey extract at the concentrations of 100, 125, and 150 ppm exhibited survival rate of 91.7 % vs. the control of 83.3%. Murbey leaves extract have been proven to be effective in stimulating molting mud crab (Scylla olivacea). The 100 ppm exhibited the best response for growth and molting percentage, while the 125 ppm showed the best performance for latent period molting of the crab. Keywords: molting response, survival rate, Scylla olivacea, murbei leaves, Morus spp.

THE EFFECTS OF WEANING TIME ON THE GROWTH AND SURVIVAL OF MUD CRAB (Scylla olivacea)THE EFFECTS OF WEANING TIME ON THE GROWTH AND SURVIVAL OF MUD CRAB (Scylla olivacea)

Indonesian Aquaculture Journal Vol 13, No 2 (2018): (December, 2018)
Publisher : Pusat Riset Perikanan, Kementerian Kelautan dan Perikanan

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Abstract

Live foods such as rotifers and Artemia are commonly used as foods in larval rearing of mud crab (S. olivacea). However, the continuous availability and nutritional consistency of live foods are difficult to control. Thus, the development of artificial diets to partially or fully replaced live foods is needed to overcome the limitations of live foods. The purpose of this research was to determine the best stage at which mud crab larvae can be weaned from live foods to artificial diets. The research experiment consisted of: treatment-1, the larvae were fed with live foods from zoea-1 to megalopa stages as the control treatment; treatment-2, the larvae were fed with artificial diet from zoea-2 to megalopa stages; and treatment-3, the larvae were fed with artificial diet from zoea-3 to megalopa stages. In treatment-4, artificial diet was given from zoea-4 to megalopa stages. The growth and survival rate of larvae in treatment-1, 3, and 4 were not significantly different (P>0.05) but significantly different with treatment-2. Based on the present results, this study suggests that artificial diet can be given to mud crab larvae (S. olivacea) from the third zoea stage.

Variasi Waktu Kualitas Air Pada Tambak Budidaya Udang Dengan Teknologi Integrated Multitrophic Aquaculture (IMTA)di Mamuju Sulawesi Barat

Jurnal Ilmu Alam dan Lingkungan Vol 8, No 2 (2017): Jurnal Ilmu Alam dan Lingkungan
Publisher : Universitas Hasanuddin

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Abstract

Penelitian ini bertujuan untuk mengetahui variasi waktu kualitas air pada tambak budidaya  udang dengan teknologi integrated multitrophic aquakulture (IMTA) yaitu udang vaname, nila,kekeranga dan rumput laut. Penelitian dilaksanakan di Kabupaten Mamuju Sulawesi Barat dengan menggunakan 2 petak tambak berukuran A. 3.675 m2 dan B. 5.250 m2 dengan perlakuan (A) udang vaname intensif, nila merah, kekerangan dan rumput laut  (B) udang faname semi intensif, nila merah, kekerangan  dan rumput laut . Pengamatan kualitas air diamati setiap 3 jam selama 24 jam yang meliputi kualitas fisika yang diamati secara in situ yaitu oksigen, suhu, salinitas dan pH. Hasil penelitian yang di peroleh  rata-rata yaitu oksigen (4,6 mg/L), suhu ( 32,76 oC), salinitas (23,7 ppt) dan pH  (8,7) dan kualitas kimia  berupa amonia, nitrit, posfat, nitrat, bahan organik dan alkalinitas di analisis di laboratorium.