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Inpurwanto Wi
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Economics, Econometrics & Finance Environmental Science

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ABSTRACT Fazri Napril; Ahmad Mulyadi Sirodjul; Inpurwanto Wi
Jurnal Sains Pertanian Equator Vol 9, No 3 (2020)
Publisher : Fakultas Pertanian Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jspe.v9i3.41524

Abstract

The continuous catches of freshwater prawns in Batu Ampar Village done by fishermen are predicted to cause a decrease in the stock of freshwater prawns. This study aims to estimate the stock of freshwater prawns in this village. Research variables cover the frequency distribution of carapace length, the relationship between length and weight, growth rate, and mortality as well as the exploitation rate of freshwater prawns. The data were collected in October - December 2019 from collectors in Batu Ampar Village. The data were then analyzed using Ms. Excel Software and FISAT II (FAO-ICLARMStock Assessment TolII). The results showed the frequency distribution of carapace lengths in male and female prawns with sizes of 31-36 mm. Analysis of the relationship between the length and weight showed a negative allometric growth pattern with b-values of 1.98 for male prawns and 1.82 for female prawns. Male prawns have an asymptotic length of (L?) 91.5 mm, with a growth coefficient of 0.40 per year. Meanwhile, female prawns have values of (L?) 75 mm with a coefficient of 0.38 per year. The slow growth of female prawns was due to the allocation of energy needed to ripen the gonads until spawning. The exploitation rate (E) of the result of prawn catches in Batu Ampar Village showed a low utilization rate (under exploited).
ESTIMATION OF ORANGE MUD CRAB (Scylla olivacea) STOCKS AS THE CATCH YIELD OF FISHERMEN OF KUBU VILLAGE, KUBU RAYA DISTRICT, WEST BORNEO Arif Triadma; INPURWANTO WI; YENI HURRIYANI
Jurnal Sains Pertanian Equator Vol 8, No 3 (2019)
Publisher : Fakultas Pertanian Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/jspe.v8i3.35343

Abstract

ABSTRACKInformation about orange mud crab (Scylla olivacea) stocks in West Kalimantan is still very minimal, especially in Kubu Village, Kubu Sub-District. The purpose of this study was to estimate the stocks of Scylla olivacea from the catch yield of fishermen of Kubu Village, Kubu Sub-District, Kubu Raya District, West Borneo Province. The method used for sampling was the Census method in which the samples to be observed were all the catches of orange mud crabs in 2 (two) collectors in Kubu Village. Sampling of S. olivacea was carried out at 1-time interval in 2 weeks for 4 (four) months. This study was conducted in September-December 2018. Based on the results of the study, S. olivacea which was caught during the study were 341 crabs, in which male crabs were caught of 255 crabs and female crabs of 86 crabs. The relationship of width and weight of male S. olivacea was negative allometric, female S. olivacea was isometric and the total male and female was isometric. The asymptotic width (L∞) of male S. olivacea was 258 mm, female was 175 mm, the total was 253.3 mm, the growth coefficient (K) of male was 0.15 per year, female was 0.21 per year, the total was 0.15 per year. The mortality of S. olivacea was mostly caused by natural mortality (M) with a value of 0.2355 per year. The rate of exploitation of S. olivacea shows that the catches carried out was still below optimal with the exploitation value (E) of 0.1673.Keyword : Stock estimation, Scylla olivacea, Width and weight relationship.
Co-Authors Ahmad Mulyadi Sirodjul Arif Triadma Fazri Napril YENI HURRIYANI