Jurnal Pengelolaan Perikanan Tropis (Journal of Tropical Fisheries Management)

Density, Water Quality Suitability and Size Distribution of Pokea Clams (Batissa violacea var. celebensis, von Martens 1897) at Lasolo River Southeast Sulawesi

Bahtiar — 2024-06-02

The pokea density and its size distribution are different in every place and time which influenced by water quality. This study aimed to determine the density and suitability of water quality, and size distribution of pokea at Lasolo River, Southeast Sulawesi. Pokea samples were collected randomly in all water segment every month for 1 year in the area of Lasolo River, North Konawe. Some samples of pokea were collected using the wide range of tangge fishing gear (traditional tool/ traditional fishing gear) as much as 6 pull times. In the process of collecting the sample of water quality, it was done simultaneously with the samples of shell. The shell density in every place and time was analyzed using the Mann-Whitney test. The preferences of pokea in water quality were analyzed using Principal Component Analysis (PCA) and Group Analysis (CA) in the package of multivariate statistical program (XLSTAT). The results of this analysis showed that the density of the middle of estuary was significantly different (higher) than its density in the initial and final regions which found upstream (lowest density) and in the estuary area, while the density of pokea was not significantly different in each month of observation. The pokea were dominantly found in small size (1.62-2.10-3.09-3.57 cm). The size of the pokea were distributed in all water segment, which were so many in May and June. The preferences habitat of pokea were the slow-flowing, high-brightness, and deep water.

Reproductive Biology Status Reproductive Biology Status of Moonfish (Mene maculata) in Palabuhanratu Bay during West Monsoon

M. Jarier Abdillah Gani — 2024-06-30

The moonfish (Mene maculata) is a demersal fish with important ecological and economic value. The high use of pitcher fish as food fish has the potential to disrupt reproductive patterns, recruitment and stock availability of pitcher fish resources, for which information on reproductive biology is minimal during the west monsoon. This research aims to analyze the reproductive biology status of moonfish in Palabuhanratu Bay. The research period took place from September 2021 to February 2022 (representing the west monsoon), with a sample of 522 fish. Fish samples were taken using a simple random sampling method at Palabuhanratu Nusantara fishing port. The data was analysis to obtain the sex ratio, allometric growth pattern, spawning season, the reproductive potential, and the size at maturity. Results shown that the sex ratio was 1:0.76, which is dominated by male fish. Moonfish have a negative allometric growth pattern. The peak of spawning season during the study period was in September and October. Reproductive potential ranges from 11,988 to 21,164 eggs. The spawning pattern of moonfish is indicated as total spawner. The result of Spearman-Karber method analysis showed that the size of the first maturity of female and male moonfish (Lm₅₀) was 143 mm and 150.5 mm TL, respectively. So, female moonfish mature gonads earlier than male fish.

Biodiversity and Vulnerability of Fisheries Resources in Berau Bay, West Papua Province

Riyan Maulana — 2024-06-30

Berau Bay, located in West Papua Province, is one of Indonesia's marine areas rich in biodiversity. This aquatic ecosystem is a crucial habitat for various fish species, which hold ecological and economic value for the local communities reliant on fisheries. However, increased human activities, including intensive fishing, pollution, and climate change, pose severe threats to the sustainability of fish resources in this region. This research aims to assess the biodiversity and vulnerability levels of fish resources in the waters of Berau Bay. The methods used include field surveys, fish sampling, species identification analysis, and calculating the diversity index. The vulnerability levels of fish resources are determined by categorizing their conservation status according to the IUCN Red List. The study results indicate that Berau Bay has a relatively high level of biodiversity with low dominance. The highest biodiversity index value in Berau Bay waters is 3.35, dominated by the families Carangidae and Scombridae. The vulnerability analysis results show that 85.71% have a low vulnerability level. However, several species exhibit high vulnerability due to excessive fishing activities, pollution, and climate change. These findings emphasize the importance of implementing effective conservation measures to ensure the sustainability of fish resources in this area. Efforts to protect habitats, manage sustainable fishing practices, and educate the local community are expected to reduce vulnerability and enhance the sustainability of the Berau Bay aquatic ecosystem.

Ecoregional Site Study on Small Islands: A case study of the significance of flora for fisheries in the Anambas Islands

Mokhamad Asyief Khasan Budiman — 2024-06-29

The formation of the Anambas Islands was a form of earth's surface dynamics that occurred over millions of years. In the process, there were at least eight land formations on the Sunda shelf. This evolution of the earth's surface led to the emergence of large islands on the Sunda shelf along with small islands around them. This also makes the Sundanese shelf part of the volcano's volcanic route. The Bunguran Formation was a bedrock complex that is thought to originate from deep-sea sediments of the Jurassic-Cretaceous age. The rocks are quite old, indicating that this formation was exposed to the surface and formed islands in the arc of the Anambas Islands group. All of these natural processes create a unique type of ecosystem, namely a rocky beach ecosystem, where the rocks at the study location were large rocks with cliffs on some of the coastlines. Meanwhile, sloping and protected locations allow the dust substrate to mix with sand to create a thin mud that allows mangrove forests to grow. Development in Anambas was carried out to grow the economy in this region. The Regional Government consistently develops in various fields. Some that stand out are the fisheries, tourism, and oil and gas sectors. It was believed that forests play a role in maintaining fisheries stocks on the coast, especially mangrove forests. Because of this, there was a need for a study that could display the flora profile in the Anambas Islands ecoregion. The results of the study show 23 species of flora in coastal forests and seven species of mangroves.

Feasibility of Ray Processing Business in Cilacap, Central Java

Mercy Patanda — 2024-06-30

Stingrays constitute a demersal fish variety prominently distributed in Indonesia, particularly in Cilacap. The flesh of stingrays is widely consumed and undergoes various forms of processing. In Cilacap, stingrays are notably transformed into salted fish, emerging as export commodities such as fillet meat, leather crafts, bones, fins, and gills. The research conducted on stingray processing aims to assess the business feasibility in Cilacap, Central Java, spanning from March to April 2022, specifically in the Menganti Village. Primary data was garnered through interviews with 10 respondents, comprising both fishermen and stingray processors. The analysis of primary data, focusing on business feasibility, reveals that the stingray processing venture is highly viable. This is evidenced by the Break Even Point (BEP) with an average R/C ratio of 11.6, surpassing the threshold of 1.0, indicative of favorability. The Payback Period (PBP) for the investment stands at four months, with an accompanying average profit of Rp. 396,892,142.9.

Habitat and Population Structure of Lobster from Southern of West Java

Dedy Cahyadi Irianto — 2024-06-30

Losbter is a an important and highly economical resources on Coastal Area, in Indian Ocean, including southern part of Java. The research on there area in Pamengpeuk (Garut), South Cianjur, Ujung Genteng conducting to evaluate of habitat and distribution, water quality and population structure. The research result shown the lobster larvae dominant on coastal and near beach, and adult lobster on deeper zone than larvae, and water quality relatively good. The species dominant found are Panulirus homarus and Panulirus pennicilatus) with composition 48%:52%. The size structure in Ujung Genteng relatively growth rapidly than Cianjur and Pamengpeuk. The finding of lobster research in this area are environmental quality appropriate where P homarus and penniculatus as dominat species, with good growth rate.