This study was conducted to analyze the effect of rainwater on the survival of koi fry. The background of this study is based on the increasing demand for koi fish which encourages breeders to improve the quality and quantity of fry production. However, the success of seeding is influenced by several factors, especially air quality such as temperature and pH. Rainwater is known to have less stable quality, especially due to its low pH value, so it is necessary to study its impact on koi fry. This study was conducted on November 25–28, 2024 in the Bossbaster experimental pond, Legok Nyenang Village, Kadudampit District, Sukabumi Regency. The media used were 15 plastic gallons, each containing 5 liters of air and 40 newly hatched koi fry. The experimental design used a Completely Randomized Design (CRD) with 5 treatment levels and 3 replications. Treatments included A (100% rainwater), B (75% rainwater + 25% well water), C (50% rainwater + 50% well water), D (25% rainwater + 75% well water), and E (100% well water). The results of the ANOVA test showed that there was no significant difference (P>0.05) in the survival value of koi fish fry in the five treatments. Thus, it can be concluded that the use of rainwater does not have a significant effect on the survival of koi fish fry. In addition, the results of water quality observations showed that all parameters were still within the standard quality range, except for the temperature which was slightly below the standard.

This study aims to determine the potential zooplankton abundance based on resting eggs in situ cijeuk Sukamekar Village Sukaraja sub-district, Sukabumi district. This research was conducted from October to November 2023. October - November 2023. The sampling location was determined by purposive sampling. The research area was divided into 5 sampling points. Data analysis using the abundance formula and the Microsoft Excel 2013 program and a microscope equipped with the scopeImage 9.0 application scopeImage 9.0 application. The results showed the abundance of Resting eggs at 5 observation points ranged from 92 ± 58 - 1009 ± 1206 grains/m², egg diameter ranged from 4.3 ± 0.57 - 7 ± 1 µm, indicating that the presence of resting egg zooplankton in the cijeruk site still has natural food potential and the results of water quality observations at each station with temperatures ranging between 24.33 ± 0.58 - 25.33 ± 0.58ºC, pH 5.08 ± 2.07 - 6.34 ± 0.31, dissolved oxygen1.83 ± 1.29 - 4.70 ± 1.95 mg/l, brightness 27.50 ± 17.26 - 114 ± 25.06 cm.

Galah shrimp is one type of freshwater shrimp that has great potential for cultivation. One of the obstacles to the growth of king prawns is water quality. This study was conducted to determine the effect of the installation of Vegetable Floating Raft (VFR) on the growth of king prawns (Macrobrachium rosenbergii). This study was conducted using the t-test method, with control and Vegetable Floating Raft treatments. The results showed that the growth pattern of weight and length of king prawns in each treatment was relatively the same. However, the daily weight growth rate of king prawns in the control treatment was greater at 3.36%, compared to the treatment of Vegetable floating raft at 1.26%, while the daily length growth rate of king prawns in the control treatment was 0.86%. The daily length growth rate in the Vegetable floating raft treatment was smaller at 0.61%. During the study the value of the degree of survival of the control treatment was 95%, while in the treatment of Vegetable floating raft the percentage of the degree of survival of king prawns was 62%. Based on the results of visual observations seen the rest of the feed and the rest of the skin during molting. It is suspected that shrimp are stressed due to changes in water quality characterized by increased ammonia levels in the last maintenance week caused by the death of kale plants in the maintenance medium.
 
 
 
 

Asnan Ridoanrisna. Efficiency Of Pakcoy Plants (Brassica Rapa) In Maintaining Water Quality To Support The Survival Rate Of Tilapia. Under Guidance By Robin And Novita Mz. Tilapia is a freshwater fish commodity with high economic value. According to data from the Central Bureau of Statistics (BPS), tilapia exports reached 12.29 thousand tons with a value of USD 78.44 million. Tilapia farming faces the risk of mortality which can lead to economic losses, one of which is caused by organic pollution. To address this issue, this research employs phytoremediation methods with varying plant densities to improve water quality and tilapia survival. The study was conducted with four treatments: A75 (plant density 75% of the aquarium surface area), A50 (50%), A25 (25%), and A0 (no plants), using an aquarium size of 60 x 30 x 50 cm³. Each treatment received chicken manure at 1.8 grams per aquarium and 40 tilapia fish per aquarium. Observations were made over 15 days in March 2023, measuring physical and chemical water parameters including DO, pH, TDS, temperature, and ammonia, as well as calculating the survival rate of tilapia. Using a Completely Randomized Design (CRD), the study found that treatment A75 achieved the highest survival rate at 62.5%. This result indicates that higher plant density in the phytoremediation method is more effective in maintaining water quality and supporting tilapia survival.

The catfish (Pangasius sp.) is a popular freshwater fish among consumers, both in Indonesia and internationally. One of the main challenges in catfish farming is the suboptimal use of feed. The commonly used feed consists of natural and artificial types. Natural feed is divided into two categories: animal-based and plant-based. The animal-based natural feed frequently used by farmers is tubifex worms. However, tubifex worms have a drawback, as their availability in the market is limited. Therefore, a study was conducted to explore the use of Azolla as an alternative feed for catfish. This study used a Completely Randomized Design (CRD) with one treatment and two levels, namely 100% Azolla and 100% tubifex worms. The study was conducted over a period of 14 days. The observed parameters included fish growth (length and weight), survival rate (SR), Feed Conversion Ratio (FCR), and water quality (temperature, pH, and dissolved oxygen). The data from the study were analyzed using a mean value test. The results showed that the use of Azolla as feed had a positive impact on catfish growth, although it was not yet effective in fully replacing 100% tubifex worms. There was an increase in biomass of 13.8 grams and an average length increase of 0.56 cm during the 14-day maintenance period.

Vertiqua is an innovation in vertical cultivation on limited land and water. Vertiqua continues to be developed to be effective in cultivating fish. This research aims to examine the effectiveness of nitrogen distribution in vertiqua using biofical top filters. The analysis used is quantitative analysis by calculating and testing the data that has been collected. Total nitrogen feed input, total nitrogen wasted, and percentage of nitrogen absorption were calculated using existing formulas. Comparative testing using the T – test on the Mini Tab application was carried out to test the effectiveness of nitrogen absorption. The research results showed that nitrogen absorption in the vertiqua using the top biofical filter was effective, ranging from 198,12 – 200,89 mg/l. Nitrogen absorption in the vertiqua without using a biofical top filter ranges from 42,75 – 43,35 mg/l. The distribution value of effective nitrogen absorption in vertiqua using the top biofical filter is shown by a P value <0,05. Vertiqua with a biofical top filter is also able to reduce nitrogen levels so that fish survival is good.

Crayfish is one of the fishery commodities that has high economic value, behind having high economic value in lobster cultivation there are several things that need to be considered, namely the conditions of the cultivation environment, feed, and water quality, based on the findings in the field of crayfish cultivators inukabumi have innovations in feed making, this is done to reduce feed production costs, the feed innovation is a mixture of pellets, conch and cassava, with a ratio of comparison in tub 1 P: 1 K: 1 S: 1.4 tub 2 P: 1, K: 1.4 S.: 1, and tub 3 100% pellets, this feed has never been tested to determine the nutritional content of the feed, in this study conducted to test the effectiveness of feed for crayfish growth, while the test results show that the proximate value in tub 1 is 20.55% Protein, tub 2 is 14.32% Protein and tub 39.41% Proterin in this study conducted 3 tubs and each stocked 100 e / tub, this study was conducted for 14 days of maintenance, and feeding is done 2 times a day, the results of this study indicate that the survival rate is low, with SR values in tub 1, (22%) tub 2, (23%) and tub 3 (10%), this is influenced by inappropriate feed, and water quality that is not in accordance with predetermined quality standards, and during the maintenance of crayfish many were found dead due to molting failure with a size of> 9.2 cm, so that the feed used is inappropriate
 
 
 

Tilapia (Oreochromis niloticus) is a freshwater fish that is in great demand by the public because it has a thick meat texture and an affordable price. The problems faced in aquaculture activities are the high cost of feed and the length of cultivation time. Feed is a vital component in aquaculture activities, therefore feed efficiency is needed to minimize production costs. The addition of fermented moringa leaf extract in pellets is expected to accelerate the growth period. This study aims to determine the effect of the addition of fermented moringa leaf extract on tilapia growth rate. This study used a complete randomized design (CRD) method with 4 treatments, namely the addition of moringa leaf extract to pellets with concentrations of 0%, 25%, 30%, 35%. The treatment was carried out for 28 days. Parameters observed in this study were fish growth including fish length, fish weight, survival rate (SR), food conversion rate (FCR) and water quality in the form of temperature, pH and DO. The data were analyzed using anova and SPSS application. The results showed that the addition of fermented moringa leaf extract with concentrations of 0%, 25%, 30% and 35% in tilapia (Oreochromis niloticus) feed for 28 days had a significant effect on tilapia growth.
 

The growth of comet fish (Carassius auratus) in the vertiqua system using a biofical filter is motivated by limited land and water which can cause low water quality to affect the growth rate of fish. The utilization of technology needs to be done to overcome these problems and the technology used is vertiqua. Previous research showed that comet fish in the vertiqua system produced slow growth rates and had high ammonia levels. Therefore, vertiqua was modified in the filter section to become a biofical filter. The purpose of this research is to test the effectiveness of comet fish growth in the vertiqua system using a biofical filter. The benefits of this research are that the vertiqua system using a biofical filter can be a solution to overcome the problem of limited land and water, become a support for system cultivation innovation, and become a reference for further research. This research method uses descriptive methods, observation and interviews. The comet fish used in the study were 3-4 cm in size. The results of this study indicate that the vertiqua system using a biofical filter is still not effective in supporting fish growth. The growth rate of comet fish in the vertiqua system is significantly different from that in the soil pond and the growth rate of comet fish in the vertiqua system is lower than that of comet fish in the soil pond. Ammonia value is relatively high from the quality standard (>0.05). However, this system is able to maintain good fish survival and good water quality, especially in temperature, pH, and DO.

Increasing catfish seed production sustainably is important to meet market needs. One effort to increase seed production is through the degree of egg hatching. This study aims to test the effectiveness of the application of the green water system on the success of hatching sangkuriang catfish eggs. The method used in this study was an experiment with two levels of treatment and 3 replications. The results of the study from the spawning of a pair of parents, obtained an average fertilization rate value produced in the GWS pond of 96.6% and the control pond 97.4%. In addition, the hatching rate showed a difference, with an average in the GWS pond of 90.6% while in the control pond 78.3%. The difference in the degree of egg hatching in the GWS pond can be associated with several factors, such as the availability of higher dissolved oxygen. Dissolved oxygen in the GWS pond is higher through the process of photosynthesis. Chlorophyceae is the most abundant phytoplankton found in the GWS hatching pond. Based on the research results, it can be concluded that the implementation of the Green Water System is effective in increasing the hatching of sangkuriang catfish eggs with an HR of 90.6%. This can be an alternative technology that is useful for cultivators to increase seed production.