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Dewa Gede Raka Wiadnya
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Engineering Environmental Science

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BIOLOGI REPRODUKSI TONGKOL LISONG, Auxis rochei rochei (Risso, 1810) DI PERAIRAN SENDANG BIRU, KABUPATEN MALANG, JAWA TIMUR Arief Setyanto; Dewa Gede Raka Wiadnya; (Menunda Publikasi)
JFMR (Journal of Fisheries and Marine Research) Vol 1, No 1 (2017): JFMR VOL 1 NO 1
Publisher : JFMR (Journal of Fisheries and Marine Research)

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The aims of this study are to know some biological  reproductive aspects of bullet tuna. Information of its biological reproductive aspects will be useful for managing the bullet tuna fishery. Determining about gonadal maturity level in fish can be completed by macroscopic and microscopic (histology) observation. The study about gonadal matuity level determination of bullet tuna has been done through histological observation. Sampling was done by taken sample from UPT P2SKP Pondokdadap Sendangbiru, from January until March 2018. Species identification follows the FAO standard procedure (species identification sheet) published 2001. A specimen was deposited at Depository Ichtyologicum Brawijaya with code DIB.FISH.11111 002 03. Forklength of the sampled 82 fish  range from 20,10 – 27,20. Gonadal samples were cut with microtome machine at 5 mm thickness. The preparates were then analyzed using biological binocular microscope at 40x magnification. The result showed that maturity stage of bullet tuna dominated by TKG IV with  34 %, followed by TKG III (31 %), TKG 1 (28 %), TKG II (5 %) and  TKG V (1 %). Lenght at first maturity occured at 23.88 cm and egg diameter were 20,92–367,65 µm.
PENDUGAAN UMUR CAKALANG, Katsuwonus pelamis (Linnaeus, 1758) YANG DIDARATKAN DI UPT P2SKP PONDOKDADAP SENDANGBIRU MELALUI ANALISIS LINGKARAN UMUR Yesika Nanda Pramurdya; Irwan Jatmiko; Muhammad Arif Rahman; Dewa Gede Raka Wiadnya
JFMR (Journal of Fisheries and Marine Research) Vol 3, No 3 (2019): JFMR VOL 3 No. 3
Publisher : JFMR (Journal of Fisheries and Marine Research)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jfmr.2019.003.03.12

Abstract

Abstract Length-growth analysis of fish cannot be completed without age information. Age study on skipjack has been done through analysis of its first-hard dorsal fin. Sampling was done using 11 fish specimen taken from UPT P2SKP Pondokdadap Sendangbiru, from January to February 2018. Species identification follows the FAO standard procedure (species identification sheet) published 2001. A specimen was deposited at Depository Ichtyologicum Brawijaya with code DIB.FISH 111103. The first hard spine of 11 fish samples were cut with IsoMet low speed cutting machine at 50 mm thickness. The preparates were then analyzed using biological binocular microscope at 40x magnification. The results showed differences in number of growth annuli (annual growth-ring) at different fish length (FL). The number of annuli varied between 4 - 6+ age year at fish length (FL) variation between 38 and 62 cm. These values were closely related to those with other methods such as Modal Progression Analysis (MPA). The number of samples successfully analyzed (5 specimen) were not sufficient for analysis of length-growth parameters (L∞, k and t0). Also, this technique did not apply for age less than yearly unit, but quite affordable (Rp.50.000,- per sample) for a fairly variable amount of specimens. 
Co-Authors (Menunda Publikasi) Arief Setyanto Irwan Jatmiko Muhammad Arif Rahman Yesika Nanda Pramurdya