One of the problems in blue swimming crab seedling is the high rate of mortality. This study is aimed at analyzing the influence of mulberry extract (ME) on the survival rate of crab larvae which are managed to metamorphose to the next stage and on the rate of larval development, as well as identifying various factors causing mortality in the mass cultured larvae, mainly mortality caused by molting syndrome. There are 4 treatments of different doses of mulberry extract being tested which are: 0 mg/100 g (control), 1 mg/100 g, 2 mg/100 g, and 4 mg/100 g. Mulberry extract is given through feeding since day-8 of the stocking, which is the time when larvae enter zoea 3. The rearing process is done over 19 days in a concrete tank with a volume of 1 ton with the initial number of zoea at ± 350.000. The findings show that mulberry extract has a significant influence on the survival rate, stage growth, and the mortality rate of blue swimming crab larvae due to molting syndrome. The higher the dose of ME in the artificial food, the higher the survival rate and the lower the mortality rate due to molting syndrome. The treatment with 4 mg of mulberry extract/100 mg is the only treatment which successfully enters megaloph and crab stage. Control treatment and the dose of 1 mg/100 g can only reach zoea 3 while the dose of 2 mg/100 g can only reach zoea 4. This study shows that the total mortality rate is still high, but it is found that the main cause is not molting syndrome. Mortality rate due to molting syndrome in the treatment of the dose of 4 mg of mulberry extract is only ± 15.61% of the total larval mortality. The unidentified factors dominate the cause of mortality (± 57.47%). Other factors are fungal attack (±17.65%), morphological disorder (±9.28%), and cannibalism (±14.93%).

Survival and metamorphosis rate of swimming crab ABSTRACTThe survival rate of blue swimming crabs and the larval metamorphosis processes are still low in hatcheries. The objective of this study was to evaluate the effects of different phytoecdysteroids doses on both the survival and the rate of Blue swimmer crab larvae metamorphosis. The study consisted of four different phytoecdysteroids treatments, namely: control (0 mg/100 g of feed), 1 mg/100 g of feed, 2 mg/100 g of feed, and 4 mg/100 g of feed. Each treatment was replicated three times. The survival rate of the larvae was analyzed through analysis of variance, while the rate of larval metamorphosis was descriptively analyzed. The results showed that the dose of phytoecdysteroid of 2 mg/100 g of artificial feed resulted in the highest survival and the fastest metamorphosis speed of crab larvae for zoea-2 and zoea-3, and the dose of 4 mg/100 g of artificial feed for stadia megalopa and crablet.Keywords: phytoecdysteroids, survival rate, metamorphosis, blue swimming crab ABSTRAKKelangsungan hidup rajungan dalam pembenihan masih rendah, dan proses metamorfosis larva masih lambat. Tujuan penelitian ini adalah untuk mengevaluasi pengaruh pemberian fitoekdisteroid dosis berbeda terhadap kelangsungan hidup dan kecepatan metamorfosis larva rajungan. Penelitian ini terdiri atas empat perlakuan dosis fitoekdisteroid yang berbeda, yaitu: kontrol (0 mg/100 g pakan), 1 mg/100 g pakan, 2 mg/100 g pakan, dan 4 mg/100 g pakan dengan masing-masing perlakuan dilakukan tiga kali ulangan. Kelangsungan hidup larva dianalisis menggunakan analisis sidik ragam, sedangkan kecepatan metamorfosis larva dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa dosis fitoekdisteroid sebanyak 2 mg/100 g pakan buatan menghasilkan kelangsungan hidup tertinggi dan proses metamorfosis larva rajungan tercepat untuk stadia zoea-2 dan zoea-3, serta dosis 4 mg/100 g pakan buatan untuk stadia megalopa dan crablet.

Pearl catfish has the main advantage of fast growth. To maximize this growth, one of the things that must be considered is the feed given. The use of factory feed for catfish seeds is common, so it is necessary to use feed raw materials that are around to be used as raw materials for homemade feed. Vegetable waste such as cabbage and tofu dregs can be used as fish feed which is processed into pellets. Cabbage vegetable waste, tofu dregs, bamboo shoots and bran have protein and carbohydrates that can be used for fish growth. This study consisted of 2 stages, namely stage 1 analyzing the comparison between factory feed and homemade feed and stage 2 analyzing the difference in dosage of homemade feed on the growth and efficiency of pearl catfish (C. gariepinus) seed feed. Data were analyzed using 2 independent samples (unpaired) t-test and ANOVA test. The results showed that the provision of factory feed and homemade feed did not have a significant effect on the growth of length, weight, and feed efficiency of catfish fry. Catfish seeds can be fed homemade feed with ingredients from fermented cabbage waste, tofu dregs flour, rebon flour, bran flour, plus vitamins and minerals. The results of the analysis of variance in the treatment of different feed doses (4%, 5%, 6%, 7%, and 10% per fish body weight), had a significant effect on the growth of catfish length and weight, and had no significant effect on feed efficiency. The higher the dose given for the maintenance period of 30 days of catfish fry gave a good effect with the best dose of 10% per fish body weight

The presence of COVID-19 can affect social interactions among the community, for example limiting themselves and their families to visit family and neighbor which they have been doing so far. This study aims to describe the social interactions that occur in communities where people with COVID-19 live. The design of this research is qualitative based on the social problems faced by the community during the COVID-19 pandemic. Research informants are people who live in RT. 27 Teluk Lerong Ulu Sub-district, Samarinda City and selected 5 people and the head of the local RT as key informants who could provide the necessary information through purposive sampling. Data collection techniques through interviews with informants and key informants using interview guidelines, observation and documentation. This research was conducted in March 2021. The data were analyzed through reduction, display, and conclusion. The results of the information research show that the social interactions that occur in people with COVID-19 sufferers are far from the cultural values ​​of the Indonesian people that have been going on so far. This can be caused by various factors such as incomplete public knowledge about COVID-19. Therefore, a local regional policy is needed to maximize the participation of community leaders such as the head of the local RT in providing complete information about COVID-19 to the people in their area. In addition, the role of the mass media is also needed in order to convey information to the wider community factually and reliably.

No abstract