The medicinal plants in aquaculture are currently being studied quite extensively by researchers. Medicinal plants can act as an inducer or aphrodisiac and an antifertility agent in gonad maturation. The aimed of the experiment was to known side effects of the herb M. malabathricum L. on maturation process in female mud crab (S. olivacea). This study used 40 crabs with an average weight of 200-250g. The experiment consists of two treatment groups. The controls group (A) that received 100 μl of aquadest and group treatment (B) received 100 μl of 2 mg/g of ethanol extract M. malabathricum L. were studied. For 5, 10, 15, and 20 days of experiment, crabs were anesthetized and sacrified. The ovary was collect for GSI and histology. The end of experiment days (20 day), the hemolymph was collect to used ELISA assay. The result showed, significant differences in treatment group and control groups (p<0.05) in terms the macroscopic morphology of ovary, the mean GSI and the diameter of oocytes. Histological showed the influence of extract M. malabathricum L. on inhibited the ovary development compared with the control groups. Based on this results, it is concluded that ethanol extract of M. malabathricum L. leaves at a dose of 2 mg/g act as an antifertility agent for ovary maturation of S. olivacea.

The Covid-19 pandemic has had a major impact on society, such as job losses, rising staples, and economic hardship. Prices of food needs that continue to increase and are not affordable have resulted in food problems, one of which is protein. One of the high-quality protein is protein from fish. Fish as a fishery commodity that is relatively easy to cultivate on a large industrial scale and household scale for food self-sufficiency is catfish (Clarias sp). The purpose of this activity is to add insight and knowledge of the community about budikdamber for food self-sufficiency. The method of implementing community service activities in Kampung Six is carried out by counseling and training methods on Budikdamber. In this training activity, a bucket with 40 liters of water and 20 catfish seeds was used. Maintenance was carried out for 60 days with ad satiation feeding three times a day. Observations were made on growth, survival and water quality. The results of the activity found that 93% of the community partners had understood about Budikdamber. Budikdamber maintenance by partner communities gets an absolute weight growth value of catfish of 14 g, catfish survival value of 75%, and 1 bunch of kale per bucket. Based on the results of this activity, it is hoped that there will be the provision of special land for Budikdamber as an example for people who want to develop in their respective yards.

The aim of this study was to evaluate the effect of Melastoma malabathricum leaf extract on growth and spawning of the blue swimming crab Portunus pelagicus. This research was conducted from March to May 2019 at the Hasanuddin University mini hatchery in Barru Regency, South Sulawesi Province, Indonesia. The study used five treatment doses of M malabathricum leaf extract: 0, 5, 10, 15, and 20μg/g of female crab body weight. The extract was dissolved in water and an aliquot of 0.1 mL was injected into each crab. The results showed that there was a decrease in growth in all treatments within the first 10 days after injection, but an increase after the 20th day. Doses of 15 and 20 ug/g resulted in the highest spawning rate, ie 100% after 30 days. Crabs with no extract treatment had the lowest spawning rate, which was only 33%. The conclusion of this study is that an appropriate dose of M. malabathricum leaf extract can be used to stimulate spawning of Portunus pelagicus.

Tilapia fish have a salinity tolerance of 0 to 10 ppt. However, the increase in salinity causes a decrease in the growth rate of these fish. In addition, the rapid maturation of the gonads causes this fish to experience a slowdown in growth. This study aimed to know the effect of giving Melastoma malabathricum extract on the growth performance of tilapia fry reared in brackish water. The study consisted of treatment with 0, 1, 3, and 6 g/kg of feed with three replications of M. malabathricum leaf extract. M. malabathricum leaf extract was mixed in feed with a CMC concentration of 2%. Feed is given as much as 3% body weight twice a day. Observations of growth performance were carried out every seven days, and the amount of feed was readjusted based on the results of sampling fish weight. The study was conducted for 70 days using brackish water with a salinity of 8 ppt. Based on the study results, it was found that the highest growth of tilapia fry at the end of the study was found in the treatment of 1 g/kg feed. The same thing was also found in measuring feed efficiency, survival, and specific growth rate. It indicated that the best concentration of M. malabathricum leaf extract in supporting the growth performance of tilapia fry was 1 g/kg feed.