The research was conducted at the Tuna Fisheries Research Station, Denpasar, Bali, in July 2018 (3 weeks duration). There were several types of high-value fish incorporated into this research: tuna, skipjack, shrimp, cob, mackerel, snapper, squid, reef fish (grouper, baronang, lobster / barong shrimp) and ornamental fish. Seaweed processing was also assessed. Benoa Fishing Port is one of the tuna landing base bases in Indonesia. It is the main port in Bali Province and ranks beside Muara Baru (Jakarta), Pelabuhan Ratu (West Java) and Cilacap (Central Java). This research aim to identified length-weight relationship, and proportion of proper catch size of bigeye tuna. Herein, bigeye tuna (Thunnus obesus) was identified visually and then assessed. The first identifier is the large size of the eye. The growth pattern of big eye tuna (Thunnus obesus) landed in Benoa Fishing Portis is isometric, where the length increase is equal to weight gain (isometric positive). The length distribution of big eye tuna was in range of 81-170 cm FL (334 fishes are obtained), and the distribution of weights varied in size from 11-95 kg, with the most common catch size being in the range of 16-20 kg (95 fishes). Of note, 60% of the fish had not reached the proper catch size.
The purpose of the study was to determine the sustainability status of Stingray capture to determine the feasibility of catching Stingray in the waters of West Manggarai Regency. The research method used is the survey method, and this was conducted in July 2018 until mid-September 2018. The parameters studied included the type of Stingray, size and sex ratio. The results showed that the Stingray species found were A. narinari, D. kuhlii, H. granulata, H. uarnak, P. sephen, and T. lymma, with species diversity still stable (H' = 1,4). The average size of Stingray species caught makes it, however, not worth catching. Comparison of the Stingray sex ratio shows that T. lymma and H. granulata species were unbalanced, thus they should not be caught. D. kuhli and H. uarnak are still in balance so they can still be harvested. Based on conservation status in IUCN, the stingray that had the most severe threat status was H. granulata and H. uarnak, thus, these should not be harvested at all.
This research was conducted in Mempawah Mangrove Park, West Kalimantan on July – August 2018. The research aims to map the benthic macrofauna community structure and its relationship with the structure of mangrove vegetation. The research method was a survey and use purposive sampling data method in observation stations based on different stages of mangrove vegetation. The observation stations consists of Avicennia marina and Rhizophora stylosa as the species of mangroves. Station 1 consists of mangroves in seedling size, station 2 consists of mangroves in pole size, and station 3 consists of mangrove trees. The benthic macrofauna consist of 8 species from 3 different classes, merostomata, malacostraca, and gastropods. The highest abundance value (155 ind/m2), diversity index (1,875) and similarity index (0,668) is in station 2. The relationship between benthic macrofauna abundance and mangrove density has -0,356 as the correlation coefficient which indicates that an increase of benthic macrofauna abundance is in line with the decrease of mangrove density. High density value in research shows that the mangrove is in seedling size, and vice versa a low density value indicates the mangrove trees. The coefficient of determination (0,1272) indicating that the abundance of benthic macrofauna is affected by the mangrove density as 12,72% and 87,28% affected by other factors.
The fishing gear used by the majority of fishermen on Madasari Beach, Pangandaran Regency, Indonesia is the krendet as known as fishing traps. Krendet is a passive fishing gear and is classified as trap net a selective because the lobster caught is legal size of lobster, which is above 200 grams. Krendet has a construction of a frame, net, bait line, towing line and ballast. One of the commodities is lobster (Panulirus sp.). Lobster catching permits have been regulated in the Minister of Maritime Affairs and Fisheries Regulation No. 17 of 2021, its stated regarding permitted lobster catching with carapace lengths above 6 cm or weight above 150 grams per head for sand lobster (Panulirus homarus). This study aims to determine the construction of the fishing gear krendet used by the fishermen of Madasari Beach, Pangandaran Regency. Based on observations that the webbing is made of PA monofilament with 3.5 inches mesh size. The Frame is made of iron in the form of a circle with a diameter of ±60 cm. The ballast used was made of stone with a weight of ±1.5 kg. The traps (krendet) also consist towing rope and a float rope. The tow rope is made of monofilament with a size of 3-4 mm diameters and a length of 15-30 m, while the float rope is made of polyethylene (PE) with a size of 1.5 mm and a length of about ±60 cm.
Batu Belah Village is one of the areas in the Anambas Islands Regency. Most of the people in Batu Belah have their main source of livelihood as fishermen so the capture fisheries business is the dominant type of fishery business in the area. One of the fishing gear units used by fishermen in Batu Belah is the encircling gillnet. Research is focused on providing an overview of fishing business activities using encircling gillnets. Operations to catch encircling gillnets in Batu Belah Village are carried out every day except on rest days, which are Fridays. The fishing operation is carried out by 1–2 fishermen. The fish species that dominate the catch is the kalat fish. Encircling gillnet fishermen are divided into 2 groups based on the material for making nets, namely Polyamide (PA) and Polyethylene (PE) net fishermen. The business capital expended for fishing using PE nets is far greater than PA nets. The total operational costs incurred by PE encircling gillnet fishermen amount to IDR 347,500.
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