DINAMIKA MUSIM PENANGKAPAN IKAN CAKALANG DAN TONGKOL DI PERAIRAN PALABUHANRATU

The monthly fluctuation of fish catch is closely related to the presence of fish or the fishing season. Information about the fishing season is important to improve the efficiency and effectiveness of fishing carried out by fishermen. Skipjack and tuna are important catches landed by fishermen in Palabuhanratu fishing port, with fishing grounds in the waters around Palabuhanratu Bay. This study aims to describe the dynamics of the catch and the effort to catch skipjack and tuna that land their fish in the Palabuhanratu fishing port and determine the fishing season. The data used is the Palabuhanratu fishing port fisheries statistical data for the 2015-2019 period. Data analysis used catch per unit effort (CPUE) analysis and moving average model. The results showed that the CPUE value of skipjack tuna fluctuates tends to increase by 0,009 tons per trip and reaches the highest in 2017 which is around 3,068 tons per trip. The CPUE value of tuna tends to increase from 0,021 tons per trip in 2015 to 0,266 tons per trip in 2019. The skipjack tuna fishing season occurs in March, July to November, while the tuna fishing season occurs from July to November. Keywords: skipjack tuna, fishing season index, moving average model, tongkol, Palabuhanratu

Characteristics of purse seine fisheries in the Sulawesi Sea (case study in Tumumpa fishing port)

The purse seine is the dominant fishing gear operating at the Tumumpa Fishing Port with a vessel of >90%. The purse seines that have developed are large pelagic targets, with the main catch targets being skipjack, mackerel tuna, and tuna. Tuna, mackerel tuna and skipjack are important commodities for fisheries in Indonesia. This study aims to determine the characteristics of purse seine fishing gear and its catch in the Sulawesi Sea. Data collection was carried out for two years from 2019-2020 at Tumumpa Fishery Port. Indications for the use of fish resources are calculated by comparing the length-at-first-capture (Lc) with the length-at-first-mature (Lm). The results showed that purse seines are very dominant in exploiting large pelagic resources (skipjack, mackerel tuna and tuna) with the proportion reaching 78%, small pelagic (21% scads and 1% other fish). The large pelagic fishing season using the purse seine vessel occurs in May – November, with 2 peak seasons in July and September. While the small pelagic occurs in May – September, with the peak occurring in July. The size when the frigate tuna was first caught was at a fork length of 25.15 cm (Lc) and Lm in a size of 28.52 cm for females and 28.29 cm for males. Meanwhile, the first scads was caught (Lc) at a length of 21.4 cm with the length-at-first-mature (Lm) being 20 cm for the female and 19 cm for the male. Based on this analysis, it was shown that the purse seines is a selective fishing gear for small pelagic fish but not selective for large pelagic fish.

The Effect of ENSO (El Nino Southern Oscillation) phenomenon on Fishing Season of Small Pelagic Fishes in Indonesia Waters

The El Nino Southern Oscillation (ENSO) phenomenon causes changes in environmental conditions such as water temperature, salinity, and rainfall. In fisheries sector, the changing environment has affected the fishing seasons and Catch per Unit Effort (CPUE) of some pelagic species. This research was conducted by calculating CPUE and fishing season index for several small pelagic fishes in Makassar Strait, Bali Strait, and Aceh waters, then comparing the index value with the fishing season pattern in two extreme periods that are 2010-2011 and 2016 - 2017. An ANOVA test was conducted to assess the significant difference between normal and extreme conditions. The results of the analysis showed that there was a significant different in CPUE between average normal condition and ENSO period. Every single species showed different response to ENSO event, mostly decreased in CPUE relate to El Nino event, except for sardine in Bali and Makassar Strait and scad in Makassar Strait. ENSO affects shift in the fishing season of big-eye scad, scad, sardine, and neritic tuna in Makassar Strait, Bali Strait, and around Aceh waters. Indian mackerel in Makassar Strait showed no change in fishing season but the CPUE showed lower than normal condition. This study shows that ENSO was significantly affected fisheries in Indonesia waters.

The fishing season and the exploitation status of mud crab (Scylla serrata) in Asahan Sea, North Sumatera, Indonesia

Crab is one of the resources that can be found in almost all areas in Indonesia, and its export increases every year. However, increase in its exploitation and mangrove forest damage affect crab availability. Scylla serrata is one of the crab commodities for export in Asahan sea, North Sumatera. Scientific studies are necessary to determine the fishing season and the exploitation status of crabs in the area. Therefore, this study was carried out for 3 years, i.e. in April–December 2018, February–December 2019, and March–December 2020, at one crab landing site in Asahan. The fishing season for S. serrata in this area occurred all year long, with peak seasons in April–June and September–December. The crab’s carapace width (CW) was 65–175 mm, where 71.2% of which were below 120 mm. Its carapace width at first capture (CWc) increased from 103.2 mm to 112.1 mm. Its fishing mortality (F) was 1.40 per year, higher than its natural mortality (M) (0.84 per year). Therefore, its exploitation rate (E) was 0.63, indicating that the species was already overfished. Suggested measures to control the fishing activity include limiting the crab size for capture in accordance with the Regulation of the Minister of Marine Affairs and Fisheries No. 12 Year 2020 and improving the environment of mangrove habitats.

Analysis of The Potential Banana Prawn (Penaeus merguiensis) in The Northern Waters of Rembang Regency

This study aims to describe the characteristics of mini bottom trawl fishing gear and fishing season, as well as to estimate the stock density and sustainable potential of banana prawn (Penaeus merguiensis), in Rembang Regency. This study was conducted from September to October 2020, in the Northern Waters of Rembang Regency, with an area of ​​1409.7 km², using both primary and secondary data. Primary data was collected directly from observations, measurements, and interviews with fishermen, while secondary data, including data on the number and types of fishing gear, as well as production and production values, was obtained through a literature review. The results of the study found that banana prawn in the northern waters of Rembang Regency was caught using two types of fishing gear, and these are sotok/mini bottom trawls and trammel nets. The total length of mini bottom trawl in this study are 15.77 m, 16.5 m, 20.44 m, and 25.2 m. The fishing season for banana prawn is from June to September The average stock density value is 16.22 kg/km² (range 4.37 to 41.14 kg/km²), the Cmsy value is 2.625 kg, the Emsy value is 4.172 trips and the average utilization rate is 44% (range 23 to 82%). Keywords: Rembang, banana prawn, stock density, and MSY.

Women’s role and support for the closed fishing season in the small-scale fisheries (SSF) of Davao Gulf, Philippines

Women’s role and support for the fisheries are barely acknowledged, they are stereotyped and marginalized and given limited participation in the fisheries. This study aims to describe the role of women and investigate their support for the closed fishing season in the small-scale fisheries (SSF) of Davao Gulf, Philippines. Survey data were collected in six study sites, only surveying women respondents involved in fishing and fishery-related activities. Interviews were conducted from November 2019 to July 2020 with respondents from Governor Generoso, Lupon, Davao City, Sta. Maria, Malita, and Don Marcelino (N = 255). The information collected was validated through seven focus groups with a total number of participants, N = 112. Results showed that women respondents who live near the shore, were poorly educated, attended elementary level (38%), do not own any parcel of land (91%), but have access to microfinance credit (64%). Women participated in the fisheries by gleaning for food and income. Some of their activities were performed to support their husbands, including preparing fishing gears (23%), food processing (6%), collecting and sorting fishery products (10%), marketing fish catches (25%), and gleaning (21%). Other results showed that women strongly support the closed fishing season which was significantly influenced by fisheries-related variables e.g. proportion of catch sold, and belonging to a family of fishers [B = 0.459 (S.E.=0.188), Wald = 5.928 df = 1, p = .015]. They support the policy for sustainability of their husband’s catches and their livelihood. Women also mentioned the need for financial seed capital for fishing gears, fishing operation and rented stalls for selling of fish.

Fishing season of large pelagic fish in Idi Rayeuk waters, East Aceh, Indonesia

Large pelagic fish live on the water surface in groups. Skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), mackerel tuna (Euthynnus affinis), mackerel (Scomberomous guttatus) are species of fishes that mainly catches by fishermen using purse seines. This study aims to determine the length and weight of large pelagic fish in the water of Idi Rayeuk and best the fishing season. This research was conducted in one month. Fish samples were collected from fishermen that used purse seine and landed their catches at the Idi Rayeuk Fishing Port, East Aceh. Additionally, the data was derived from the fishing port time-series during 2015 to 2019. The result showed that the yellowfin tuna (Thunnus albacares) has a length between 37 - 58 cm with a weight of 1.0 - 3.2 kg, skipjack tuna (Katsuwonus pelamis) 32 - 58 cm in length and weight 0.5 - 3.0 kg, mackerel tuna has 33 - 54 cm of length with a weight of 0.6 - 2.5 kg, and mackerel has 44 - 66 cm of length and weighing 0.7 - 1.7 kg. Its also found that the peak season for catching yellowfin tuna (Thunnus albacares) and mackerel tuna is May and June, and the lowest season in December for the yellowfin tuna, and December and January for the mackerel tuna. The peak season for skipjack fishing occurs in May, August, and October, and the low season occurs in November and December. Meanwhile, the peak season for fishing mackerel occurs in May, September, and October, while the low season occurs in January, February, and March.Keywords:Fishing seasonLarge pelagicPurse seineIdi RayeukAceh

Monitoring on the output of pollock roe during fishing season in 2021

The output of roe from pre-spawning pollock was analyzed in the Western Bering Sea, Eastern Kamchatka fishing zones and the Sea of Okhotsk fishing zone during legal specialized fishing for pollock from 01.01.2021 to 10.04.2021 in order to preserve and rational exploitation the pollock population. It was concluded that the output of pollock roe (raw fish eggs) calculated as a percentage of the total weight of raw fish, which were subjected to processing irrespective of sex (females and males treated together) during the 2021 fishing season, when legal specialized fishing for pollock was conducted in the Western Bering Sea fishing zone, Karaginsky subzones, Petropavlovsk-Commander subzones and the Sea of Okhotsk fishing zone, did not exceed the values determined in the Order №267 issued on 23 May 2019 by the Ministry of Agriculture of the Russian Federation.