Open Access Original Research Article

Sinking Feed Efficiency in Growth Performance, Feed Conversion Ratio (FCR) and Yield of Tilapia (Oreochromis niloticus) at Different Stocking Densities

Md. Hashibur Rahman, Md. Nasirul Islam

Asian Journal of Fisheries and Aquatic Research, Page 1-26
DOI: 10.9734/ajfar/2021/v14i530305

The efficiency of feed is considered as one of the most crucial factors that affects the growth performance, feed conversion ratio and yield as well. The study was aimed to compare the growth parameters of tilapia at different stocking densities to detect the efficiency of sinking feed assessing the growth trends at various sampling stages. To evaluate the comparative yield, the study was carried out in twelve concrete tanks under an outdoor laboratory shed. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive and semi-intensive aquaculture system, respectively. To evaluate the growth trends sinking feed was used for feeding the fish during the experimental period for T1 (Intensive) and T2 (Semi-intensive), respectively. The feed was supplied in each with three replications at the rate of 20%, 15%, and 10% of the body weight of fish, respectively. The daily ration of feed was delivered to fish dividing into two parts daily. Aeration facilities using air stone aerator were installed for 24 hours. To assume the consecutive growth trends, weight of fish was recorded in 3 days interval to have better understanding on the yield performance in relation to the feed conversion ratio (FCR). Water quality parameters i.e., temperature and dissolved oxygen (DO) were recorded two times daily. The final weight gains of fish were 133.77±5.65 gm and 50.70±2.40 gm for T1 and T2, respectively. The mean percent weight gain of tilapia was higher in T1 (1127.25±0.00) than T2 (518.51±0.00 gm). Feed conversion ratio (FCR) in T1 and T2 were 1.97±0.11 and 1.70±0.07, respectively. The specific growth rates (SGR) of tilapia in T1 4.90±3.03 and 4.78±3.83 considering the data at the beginning and the end of the production cycle, respectively. Higher total production was obtained in T1 (1070.19 gm) than T2 (610.00 gm) with 100% survival in both the treatments. The present study reveals that, the efficiency of sinking feed was higher in T1 than T2 and farmers might be suggested to practice tank-based intensive aquaculture system to get higher production in a short period of time.

Open Access Original Research Article

Structure of Seagrass Community in the Karapyak Beach, Pangandaran Regency, West Java

Ana Akmalia Putri Sutia, Herman Hamdani, Heti Herawati, Mochamad Rudyansyah Ismail

Asian Journal of Fisheries and Aquatic Research, Page 27-39
DOI: 10.9734/ajfar/2021/v14i530306

Karapyak Beach is one of the beaches that has a variety of abundant marine ecosystems. One of the marine ecosystems is seagrass. This study aims to identify the structure of seagrass communities in Karapyak waters based on seagrass species, species density, species frequency, diversity, and uniformity. This research was conducted in February – April 2021. The method used is a survey method with direct observation at each predetermined station using a square transect measuring 1 x 1 m2. While the determination of stations and observation points is done by purposive sampling method. The research location is divided into three stations, each station is divided into five substations (plots), and a 50 m transect line is made perpendicular to the shoreline. Furthermore, the results showed four types of seagrass found in the waters of Karapyak Beach, namely Cymodocea rotundata, Thalassia hemprichii, Halodule pinifolia, Halodule uninervis. The density of seagrass at station I was in the medium category, namely 125 individuals/m2, with a cover percentage of 86%. Then the lowest seagrass density was found at the second station, which was 104 individuals/m2 including the unhealthy category with a cover percentage of 58%. While the highest density score was shown at the third station, namely 144 individuals/m2 with a closing percentage of 94%.

Open Access Original Research Article

Analysis of the Brackish Water Aquaculture Development in Indonesia

Asep Agus Handaka Suryana, Afifah Sabila

Asian Journal of Fisheries and Aquatic Research, Page 40-46
DOI: 10.9734/ajfar/2021/v14i530307

Brackishwater aquaculture is one of the fisheries activities that can be a driving force for the country's economy with its ability to generate profits and reduce unemployment in coastal areas of Indonesia. The development of brackishwater aquaculture can be used as a barometer in fisheries development efforts. This study aims to analyze the development of aquaculture in each province in Indonesia. This research was conducted from August 2020 to July 2021. The type of data used is secondary data obtained from the Directorate General of Aquaculture, Ministry of Marine Affairs and Fisheries. Data analysis used the quantitative descriptive method. The results of this study indicate that the development of brackishwater aquaculture viewed from the aspect of labors, land area, production, and productivity tended to be low during 2004 to 2016 but there were significant changes in provinces that were not centers of aquaculture activities (Maluku, Riau Islands, DKI Jakarta, and North Maluku) this indicates a positive situation that the province is trying to carry out aquaculture activities by facing the existing risks.

Open Access Original Research Article

Effect of Stocking Density on Growth Performance and the Survival of Golden Mahseer, Tor putitora (Hamilton) Fry

Md. Golam Sajed Riar, Nur- A Raushon, Sumit Kumer Paul

Asian Journal of Fisheries and Aquatic Research, Page 47-54
DOI: 10.9734/ajfar/2021/v14i530308

Growth performance and survival of Tor putitora fry under different stocking densities were evaluated fry rearing system. The experimental period was 10 weeks from 31 December to 10 March 2019. The experiment was carried out in nine earthen ponds of 0.04 ha each under three treatments with three replications.  Thirty days old fry were stocked at the rate of 1.0X105/ha was designated as treatment- 1 (T1), 1.5X105/ha` as treatment- 2 (T2) and 2.0X105/ha as treatment- 3 (T3), respectively. Fry were fed with commercially available nursery feed containing 32% crude protein. It was observed that, lower stocking density showed highest daily weight gain in T1 (growth 0.066 ± 0.006 g/day) compared with higher stocking density in T2 (growth 0.044 ± 0.004 g/day) and T3 (growth 0.024 ± 0.003 g/day), respectively. It is also noticed that, the lower stocking showed the highest survival rate (79.66 ± 4.34 %) than the other two treatments (66.97±3.67 and 54.67± 3.12 %). The values of different water quality parameters were within the optimum ranges for the rearing of carp fry. Water quality parameters did not show significant variations in the experimental ponds under different stocking densities. Among these three stocking densities lower stocking density (T1) showed the best result compare with the other two higher stocking densities.

Open Access Original Research Article

Financial Analysis of Costs of Fish Feed Production with Restaurant Waste as Basic Ingredients (Case Study in Jatinangor District, Sumedang Regency, West Java)

Yuli Andriani, Atikah Nurhayati, Irfan Zidni, Muhamad D. Cahya

Asian Journal of Fisheries and Aquatic Research, Page 55-60
DOI: 10.9734/ajfar/2021/v14i530309

As an educational city, Jatinangor has a fairly large population density. In turn, it generates restaurant organic waste in large quantities. Excessive production of organic waste will be a problem if it is not accompanied by good management and utilization. One of the efforts in utilizing restaurant waste is to turn the waste as fish feed. This study aims to calculate the production of restaurant waste and analyze the cost of production of fish feed using restaurant waste flour. The production of restaurant waste was calculated using purposive random sampling, while the cost of feed production was determined by using variable costing method. Questionnaires and research primary data were used to collect data. The results obtained from this study were as such: production of restaurant waste in the Jatinangor area is 261.7 Kg/day, the cost of production for fish feed with the basic ingredients of restaurant waste flour is 70,013,127 IDR with a production capacity of 6,913.1 kg of fish feed per year, so that the cost of feed per kilogram is 10,127.60 IDR, and the selling price of feed is 12,200 IDR/kilogram with a profit of 20%. Thus, it can be seen that independent feed production using restaurant waste can be a solution in the utilization of waste and can also be used as a source of income for the surrounding community.