JURNAL MINA SAINS

Analysis of the feasibility of fishing using push net fishing gear

2023-09-10T02:19:04+00:00

Fishing activities using sondong fishing gear are classified as small-scale, with the main catch being shrimp. Shrimp is a fishery commodity that has high economic value, so fishing activities using this fishing gear should provide profits. However, it is currently unknown whether this fishing activity benefits fishermen. The research aims to assess the feasibility of using sodong fishing gear in Babalan Village, Demak, Central Java. The method used is a survey with direct interview techniques to fishermen using a questionnaire. The research sample used was 30 fishermen who were chosen randomly. Data analysis uses cost, income, profit, Revenue Cost Ratio, Benefit Cost Ratio, Payback Period, Net Present Value, and Internal Rate of Return analysis. The research results show that the average investment cost incurred by fishermen is IDR. 17,000,000. The total costs incurred in 1 year average Rp. 105,244,000. The income and profits earned differ in each season. The R/C value for each season from this fishing effort is >1, meaning this business is feasible and provides profits. The Net B/C value of this business is 5.9, meaning this business is feasible. Payback period analysis shows a return on capital of 9 months. The NPV value in this fishing effort is positive. The IRR value is 8.15% > 7% interest rate.

Optimizing the addition of calcium carbonate (CaCo3) on the growth and survival of glass eel (Anguilla sp.)

2023-08-04T02:45:07+00:00

The development of eel fish cultivation has quite good business opportunities and prospects. However, the main obstacle in cultivating eel fish is the high mortality in the glass eel phase, so it has a survival rate of 30-50% and slow growth, namely less than 3.1%. One effort to maximize glass eel maintenance is through optimizing alkalinity as a buffer for water quality. The alkalinity level in the maintenance medium can be regulated by adding calcium carbonate (CaCO3). This research aims to determine the effect of adding CaCO3 to the rearing media on glass eels' growth and survival rate. The study was conducted for 14 days in March 2023. The method was wholly randomized with three replications in 3 treatments (P1=0 mg L-1, P2=50 mg L-1, P3=100 mg L-1). Analysis of research data used the ANOVA test. Adding CaCO3 produced a natural effect on length growth with a value of 0.16 cm, weight growth of 0.73 mg L-1, and a survival rate of 74%. The treatment did not naturally affect the alkalinity levels in the glass eel maintenance media. The best treatment effect was found in P2 (50 mg L-1). These results show that adding CaCO3 to the glass eel-rearing media decreased but did not naturally affect alkalinity levels.

Balance of coastal and marine assets for Panggang Island and Semak Daun Island, Kepulauan Seribu DKI Jakarta

2023-09-27T04:11:04+00:00

Coastal and marine areas hold great wealth for the welfare of coastal and small island communities with dynamic magnitudes. Panggang Island and Semak Daun Island have the potential for promising coastal and marine resource assets and provide benefits for community welfare. The research aims to compile a balance sheet of coastal and marine resource assets for Panggang Island and Semak Daun Island. The research was conducted in the Seribu Islands Administrative District, DKI Jakarta Province, in August-September 2023. It included various information data to map the value of ecosystem services and asset balances. The economic valuation method using the benefits transfer technique is used as input for the value of natural resource assets and the coastal and marine environment. The research results show that the value of coastal and marine resource assets of Panggang Island and Semak Daun Island have quite significant dynamics. In 2014-2019, the coastal and marine resource assets of Panggang Island and Semak Daun Island experienced a considerable decline, namely 1,001.92 billion ( Panggang Island ) and 59.97 billion ( Semak Daun Island ). They decreased respectively by 200.38 billion per year (12.34%) and decreased by 11.99 billion/year (9.29%). The estimation results show that there will be an improvement in asset value in 2022 for Panggang Island to 687.73 billion and for Semak Daun Island to 82.32 billion. The estimation results show that there has been an improvement in the ecosystem during the 2020-2022 period. This increase is due to reduced pressure on coastal and marine ecosystems on the two islands. Ecosystem-based integrated management needs to be carried out so that the sustainability and value of resource assets can benefit the welfare of coastal and small island communities.

Addition of probiotic EM-4 with different concentrations in cultivation media on the growth and survival rate of freshwater pomfret fish (Colossoma macropomum)

2023-09-04T03:59:49+00:00

This study aims to analyze the addition of EM-4 probiotics with different concentrations to the cultivation media on the growth and survival of freshwater pomfret fish (C. macropomum). This research was carried out for 50 days at the Fish Production and Reproduction Laboratory, Aquaculture Study Program, Faculty of Agriculture, Mataram University. The method used was an experiment using a Completely Randomized Design (CRD) consisting of 4 treatments and three replications, namely without the addition of probiotics or control (P1); probiotic EM-4 0.5 ml/L (P2); probiotic EM-4 1.5 ml/L (P3); and probiotic EM-4 2.5 ml/L (P4). Test parameters include absolute weight, absolute length, specific growth rate, survival rate, feed conversion ratio, feed utilization efficiency, air quality, and bacterial density. Data analysis used analysis of variance (ANOVA) at a confidence level of 95%. If the research results show significant differences, further tests use the Duncan Multiple Range Test (DMRT). The research showed that adding EM-4 probiotics to the rearing media at different concentrations could significantly affect (p<0.05) fish survival rate, absolute weight, specific growth rate, feed conversion value, and feed utilization efficiency. The treatment of adding EM-4 probiotics to the maintenance media with a concentration of 1.5 ml/L of air provides the best value for survival rates, growth, FCR, and EPP. It can maintain the quality of the cultivation media in good condition for the growth of freshwater pomfret (C. macropomum).

Evaluation of growth performance and water quality of vannamei shrimp (Litopenaeus vannamei) in intensive cultivation systems

2023-08-11T03:31:11+00:00

The success of shrimp cultivation is assessed based on the resulting performance, survival, growth, and total shrimp production. Apart from parent quality and feed quality, water quality is a determining factor in the success of shrimp cultivation. Good water quality will increase cultivation productivity. The research aims to measure the performance of vannamei shrimp using an intensive cultivation system at PT Bumi Cimandala Lestari by paying attention to the quality of cultivation waters. This research uses a descriptive method by following the entire series of cultivation production in the Bumi Cimandala Lestari shrimp pond. The activity lasts three months, from August to November 2022 at PT. Bumi Cimandala Lestari is located at Kp. Cipeundeuy, Surade Village, Sukabumi Regency. The results showed that the average survival rate from 8 cultivation ponds reached 67% with a growth rate of 0.26 g/day. The total production obtained was 55.42 tons with a size of 70-100 fish/kg. Water quality during the study was within the optimal range. The pH value of the water ranges from 7-9 with salinity ranging from 18.1 – 20.4 ppt. Dissolved oxygen value > 5 mg/L, and alkalinity ranges from 122 – 183 mg/L. The research showed that cultivation ponds had a temperature range between 24.8-30.4 and DO ranging from 2.49-8.23 mg/L. Water quality conditions are thought to support the growth and survival of shrimp well

Prevention of white impurities in vaname shrimp (Litopenaeus vannamei) using noni fruit extract (Morinda citrifolia) in semi-intensive shrimp cultivation system

2023-09-13T23:12:57+00:00

White vanamae shrimp is one of the superior commodities in aquaculture. Currently, the productivity of white vanamae shrimp has not yet reached its production target. So, it is necessary to increase the amount of production on a gradual scale carried out by the community. In shrimp farming activities, disease problems are often encountered. Namely is a white stool, white feces, or White Feces Disease (WFD). The clinical symptoms that arise when shrimp are attacked by White Feces Disease (WFD) are that the shrimp's appetite decreases, the shrimp's intestines change color to white and even look empty due to lack of food intake, white feces floating on the surface of the water, and the shrimp's growth becomes abnormal. This WFD disease can be caused by poor cultivation practices, unhealthy seeds, and poor water quality, causing the emergence of disease microorganisms such as Vibrio sp bacteria. One way to treat this disease is to provide alternative medicine, noni fruit extract. This research consisted of 3 noni extract treatments and consisted of 3 replications, namely Treatment A: 10 mL/L; Treatment B: 15 mL/L; Treatment C: 20 mL/L. The noni dose is given at the specified dose once daily for one month. The survival rate of shrimp increased to 86.7%.