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Use of Mixed Feeds for Inducing Gonad Maturation of G4 Transgenic Mutiara Catfish Broodstock Indoor Hatchery

100%
Buwono I. D., Apriliani I. M., Herman R. G., Napsiah I. S.
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EN
This research aims to determine the optimal dose of boiled mackerel tuna mixture on HI-PRO VITE 781 feed on gonadal maturity index and feed conversion ratio of transgenic mutiara catfish G4 in indoor hatchery maintenance at optimal temperature. This research was conducted at the Hatchery of the Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran. The method used was an experimental method with a completely randomized design (CRD) method with four treatments, namely the difference in the dose of boiled mackerel tuna administration in comercial feed and three replications. The treatment in this study was the administration of boiled mackerel tuna doses of 3.5%, 2.5%, 1.5% in mixed feeds to G4 transgenic mutiara catfish and tested on non-transgenic mutiara catfish with a percentage of 3.5% female weight biomass and then added an 30 g HI-PRO-VITE 781 with two times feeding frequency. The research parameters included gonad maturity index and feed conversion ratio. The results showed that feeding a mixture of boiled mackerel tuna and HI-PRO-VITE 781 had a significant effect on the gonadal maturity index and feed conversion ratio. Feeding boiled mackerel tuna at 1.5% was the best treatment with a gonadal maturity index of 47.16% for females and 4.98% for males and a feed conversion value of 1.19 for 56 days of rearing.
2
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Construction of Traps (Krendet) as traditional fishing gear of Lobster (Panulirus sp.) in Pangandaran Regency, Indonesia

100%
Rina R., Dewanti L. P., Ismail M. R., Apriliani I. M.
World News of Natural Sciences
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2022
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vol. 41
85-97
EN
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.
3
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Identification of Fishing Business Activities with Encircling Gillnet in Anambas Islands Regency, Indonesia

88%
Apriliani I. M., Dewanti L. P., Herawati H., Putra P. K., Ramdhani F.
World News of Natural Sciences
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2023
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vol. 50
197-205
EN
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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