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Ectoparasite Prevalences of Grouper Fish (Epinephelus fuscogutatus x Epinephelus polyphekadion) Cultured in Floating Net Cages Sudirman Adibrata; Muh Yusuf; Cristiana Manullang
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 25, No 1 (2020): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (31.293 KB) | DOI: 10.14710/ik.ijms.25.1.23-30

Abstract

Monitoring the health of the reared fish in a floating net cage (FNC) is often conducted by examining their ectoparasites. This study determines ectoparasite prevalences of grouper fish (Epinephelus fuscogutatus x E. polyphekadion). It was conducted in the waters surrounding Pongok Island, South Bangka Regency. The health examination of both fish and ectoparasites was carried out by applying simple random sampling during three periods, November 2016 (I), February 2017 (II) and May 2017 (III). Hydro-oceanography surveys were done every month during the three years. The grouper checkings (I, II and III) indicated the prevalences of ectoparasites in these periods were 43.3%, 8.8% and 13.5%, respectively. Fish death highly occurred in the period I, and the grouper survival rate at harvesting time was only 70% from initial seed stocking of 1,500 fish. The ectoparasite intensities during the research periods were 1.6, 1.6 and 1.5, respectively. This condition implies that every 10 groupers would potentially be attacked by at least 15-16 ectoparasites. A slow seawater current flow triggered the quick uplifting of the ectoparasites from the seafloor. The water condition at the FNC location in 2011 and 2017 was still under the quality standard. The ectoparasites were coming from the surrounding environment of the FNC location. It is inevitable that the fish culture management should focus on cleansing the ectoparasites attaching on the groupers, dusting the net cage clean, and arranging the harvest pattern on a particular month following the surrounding environmental condition to prevent ectoparasite attacks.
Chart Datum and Bathymetry Correction To Support Managing Coral Grouper In Lepar And Pongok Island Waters, South Bangka Regency Sudirman Adibrata; Fredinan Yulianda; Mennofatria Boer; I Wayan Nurjaya
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 23, No 4 (2018): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (395.776 KB) | DOI: 10.14710/ik.ijms.23.4.179-186

Abstract

Corrected bathimetry data is highly required to improve the quality of sea floor map, for a range of purposes including coastal environmental monitoring and management. This research was aimed to know chart datum values used for correctting bathymetry data at Bar-cheeked coral trout grouper (Plectropomus maculates) fishing ground in Lepar and Pongok Island waters 02o57’00”S and 106o50’00”E and 02o53’00”S and 107o03’00”E, respectively, South Bangka Regency, Indonesia. The study was carried out from November 2016 to October 2017, tidal data used for 15 days from September 16–30, 2017 using simple random sampling technique with the total of 845 points of measurements. To calculate tyde harmonic constituents values this study employed admiralty method resulting 10 major components. Results of this research indicated that harmonic coefficient values of M2, M2, S2, N2, K1, O1, M4, MS4, K2, and P1, were 0.0345 m, 0.0608 m, 0.0276 m, 0.4262 m, 0.2060 m, 0.0119 m, 0.0082 m, 0.0164 m, and 0.1406 m, respectively. Values of mean sea level, chart datum, and F, were 0.9620 m, 0.0500 m, and 0.0664 m, respectively, with diurnal type (F= 6.64). Correcting bathymetry values of surveyed location results a deviation about 1.2 m in depth. The calculated chart datum as well as corrected bathymetry provides information that can be used as vertical refrerence datum for generating sea floor map for determining the fishing ground area of bar-cheeked coral trout grouper. Fishing depth usually ranges between 4.2 and 40.8 m. Average water depth in the fishing ground ranged from 14.7 to 22.5 m.
Kandungan Logam Berat Pb pada Air Laut, Sedimen dan Kerang Darah (Anadara granosa) di Pantai Sampur Kabupaten Bangka Tengah Pitria Handayani; Kurniawan Kurniawan; Sudirman Adibrata
PELAGICUS Volume 1 Nomor 2 Mei 2020
Publisher : Politeknik Kelautan dan Perikanan Karawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (368.617 KB) | DOI: 10.15578/plgc.v1i2.8910

Abstract

Pantai Sampur merupakan kawasan perikanan tangkap dan masih terdapat aktivitas pertambangan timah yang berdampak pada organisme dasar perairan, yakni kerang darah. Penelitian ini bertujuan menganalisis parameter lingkungan perairan, menganalisis kandungan logam berat Pb pada air laut, sedimen dan kerang darah (Anadara granosa) dengan ukuran yang berbeda di pantai Sampur. Kajian ini dilakukan dengan metode purposive sampling dan analisis data secara deskriptif komperatif. Hasil parameter lingkungan perairan masih berada pada kisaran normal dan dapat ditoleransi bagi kehidupan kerang darah. Hasil analisis logam berat Pb di air laut pada ketiga stasiun adalah 0,101–0,175 mg/l dan hasil dari pengukuran logam berat di sedimen adalah 12,840–13,487 ppm. Hasil analisis logam berat Pb pada kerang darah ukuran >3 cm pada ketiga stasiun adalah 0,324–0,436 mg/kg dan ukuran <3 cm pada ketiga stasiun adalah 0,472–0,576 mg/kg. Meskipun kandungan logam berat Pb berada dibawah baku mutu, namun konsumsi kerang darah dari pantai Sampur tetap harus dibatasi.