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Aspek Biologi dan Potensi Lestari Sumberdaya Lobster (Panulirus spp.) di Perairan Pantai Kecamatan Ayah Kabupaten Kebumen Kadafi, Muammar; Widaningroem, Retno; Soeparno, Soeparno
Jurnal Perikanan Universitas Gadjah Mada Vol 8, No 1 (2006)
Publisher : Universitas Gadjah Mada

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Abstract

The research on biological aspects and maximum sustainable yield of spiny lobster (Panulirus spp.) in Ayah coastal waters Kebumen Regency aimed to know biological aspects (including species of lobster, length-weight relationships, and sex-ratio), maximum sustainable yield, and exploitation rate of spiny lobster. Biological data were collected in January-February 2004 with census and survey methods. Production and effort data between 1998 to 2003 were used to estimate maximum sustainable yield of spiny lobster. This research found six species of lobsters (Panulirus homarus, P. ornatus, P. penicillatus, P. longipes, P. versicolor, and P. polyphagus). Length-weight relationships based on the sex and carapace length showed isometric and allometric growth models. Male and female ratio was 1,06:1. The maximum sustainable yield was 19,498 kg/year and the exploitation in this area was already overfished.
KEMAMPUAN ADAPTASI KEPITING BAKAU (Scyla serrata) TERHADAP PERUBAHAN SALINITAS AIR Widaningroem, Retno; Isnansetyo, Alim
Jurnal Perikanan Universitas Gadjah Mada Vol 1, No 1 (1996)
Publisher : Universitas Gadjah Mada

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Objectives of this research were to know water salinity change which can be use for culturing and fattening of mud crab, and to know adaptation of mud crab on water salinity change. The research used modified bioassay method and completely randomized factorial design consisted of two factor namely water salinity change (0,5 and 10 ppt of water salinity change) and duration of water salinity change (3 and 6 hours).The result indicated that decreasing salinity by 5 and 10 ppt per 3 and 6 hours from 20 to 0 ppt could be adapted by mud crab. As well as increasing if salinity by 5 and 10 ppt per 10 and 6 hours from 20 to 5 ppt could be adapted by mud crab. Mud crab was able to adapt water salinity change by 5 and 10 ppt per 3 and 6 hours from 0 to 50 ppt.
Parasit Anisakis sp. Pada Populasi Layur (Trichiurus sp.) yang Didaratkan di Pelabuhan Ikan Cilacap Suadi, Suadi; Helmiati, Senny; Widaningroem, Retno
Jurnal Perikanan Universitas Gadjah Mada Vol 9, No 2 (2007)
Publisher : Universitas Gadjah Mada

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Abstract

The aims of this research were to determine the population parameters of hairtails (Trichiurus sp.) and the potential use of fish parasite (Anisakis sp.) for its stock assessment. Fishery survey was conducted at southern coast of Cilacap, Central Java on September to October 2004. Total length and weight of 527 fish samples were measured in five periods during the field survey and 30 samples were collected randomly for further observation to analyze the Anasakis sp., sex ratio, and gonad maturity. The average length of catched fish was ranged between 62  to 70 cm and weight was 200  to 250 g. The  length-weight (L-W) relationship indicated positive allometric growth (b=3.6076). Sex ratio was balance at 1:1 with gonad maturity range between I to IV for female and I to III for male. Anisakis sp. were found as endoparasite and potentially used as biological tags for fish stock assessment such as migration pattern and feeding habit.