Sexual Maturity, Reproductive Pattern and Spawning Female Population of the Blue Swimming Crab, Portunus pelagicus (Brachyura: Portunidae) in East Lampung Coastal Waters, Indonesia

Zairion,; Wardiatno, Yusli; Fahrudin, Achmad

doi:10.17485/ijst/2015/v8i7/69368

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…Higher spawning frequencies were also recorded in December 2019 (10.5%), April 2020 (10%) and October 2019 (9.4%). Zairion and Fahrudin (2015) described the spawning of P. pelagicus in Lampung Coastal Waters of Indonesia as seasonal-continuous in a year with peak spawning and breeding in April to June and October to November. While Ernawati et al (2017) observed fast growth and peak season of BSC between February to April and in August to October in Java Sea, Indonesia.…”

Section: B Gonadal Stages Length At First Maturity (Lm) and Spawning Potential Ratio (Spr)mentioning

confidence: 99%

Stock Assessment of the Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) in Stock Enhancement Sites of Danajon Bank, Central Philippines

Abrenica¹,

Fajardo²,

Paran³

et al. 2021

TPJF

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The stock status of Blue Swimming Crab (BSC), Portunus pelagicus, locally known as lambay, in Danajon Bank was assessed from June 2019 to September 2020 to monitor the impact of the BSC stock enhancement initiative by the Philippine Association of Crab Processors, Inc. (PACPI) in collaboration with BFAR 7. The stock was assessed based on the indicators, namely, catch per unit effort (CPUE), exploitation rate (E), average size, length at first maturity (Lm), and Spawning Potential Ratio (SPR). Data analysis was done using FAO-ICLARM Stock Assessment Tools (FiSAT) II software and the Barefoot Ecologist’s Toolbox for the Length-based Spawning Potential Ratio (SPR). Results show that BSC dominated the monitored landings accounting for 66% of the overall catch harvested mainly by crab pot and crab net. Higher CPUEs were obtained in the months of July, June, May and August with annual mean observed to be higher than the previous assessment conducted by ECOFISH in Danajon Bank particularly for crab pot. Population characteristics revealed that male crab grew slightly faster having higher asymptotic length (L∞ =21.65cm Carapace Width or CW) and growth constant (K=1.3yr-1) than female (L∞ =21.40cm CW, K=1.28yr-1). Sex ratio of male to female was at 1:1.28 indicating plenty of female crabs were captured than male. Gravid crabs were abundant in May, December, April and October. Recruitment pattern showed two pulses with primary peak occurred in April and May and secondary pulse happened in August and September. Encouraging performance indicator noted from this assessment was on the bigger probability of capture sizes and mean length of commonly caught BSC falling above the recommended catchable size of 10.2 cm CW pursuant to DA-DILG JAO No. 1 s. 2014. Maturity size (Lm) was estimated at 10.54 cm CW, though smaller than the previous reported Lm values in Danajon but still within the threshold. The estimated SPR was 26%, higher than 20% limit reference point but slightly lower than 27% recorded in the assessment done by ECOFISH Project in 2014 to 2015. The present SPR though lower than 30% precautionary threshold however higher than 21% generated in Visayan Sea Region 7 for the same period. The higher SPR in Danajon Bank compared to Visayan Sea maybe credited to the effect of stock enhancement activity implemented in the area, though observation is not yet conclusive. On the other hand, unfavorable indicators were seen on high exploitation rate (E), high exploitation at yield per recruit some of which already breached the optimum level, consequently subjecting Danajon Bank to high fishing pressure. It is recommended to continue the BSC stock enhancement program of PACPI and BFAR 7 taking consideration some strategies for improvement specified in the recommendations.

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Section: B Gonadal Stages Length At First Maturity (Lm) and Spawning Potential Ratio (Spr)mentioning

confidence: 99%

Stock Assessment of the Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) in Stock Enhancement Sites of Danajon Bank, Central Philippines

Abrenica¹,

Fajardo²,

Paran³

et al. 2021

TPJF

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“…Ukuran karapas rajungan yang diatur dalam PERMEN KP 12/2020 adalah lebar karapas, sehingga perlu dilihat hubungan antara lebar karapas dengan panjang karapas dan tinggi tubuh rajungan dalam pembuatan celah pelolosan . Beberapa penelitian menyebutkan bahwa rajungan betina yang belum matang gonad memiliki panjang karapas <4,6 cm (Boutson et al, 2009;Johnson et al, 2010;Zairion et al, 2015) dan <4,8 cm (Sunarto, 2012). Hubungan antar ukuran tubuh rajungan adalah linear (Josileen, 2011b), sehingga jika ukuran panjang karapas diketahui, maka ukuran lebar karapas bisa didapatkan.…”

Section: Hasil Dan Bahasan Hasilunclassified

UJI LABORATORIUM KESESUAIAN UKURAN CELAH PELOLOSAN PADA BUBU LIPAT TERHADAP TINGKAT PELOLOSAN RAJUNGAN (Portunus pelagicus)

Rahman

Harlyan

Iranawati

et al. 2020

JURNAL PENELITIAN PERIKANAN INDONESIA

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Rajungan (Portunus pelagicus) merupakan salah satu komoditas perikanan yang memiliki nilai ekonomis penting yang ditangkap dengan alat tangkap pasif, seperti bubu lipat. Penggunaan celah pelolosan pada bubu diharapkan mampu memenuhi ukuran rajungan yang diperbolehkan untuk ditangkap sebagaimana yang tertulis pada Peraturan Menteri Kelautan dan Perikanan 12/2020 (lebar karapas >10 cm). Tujuan dari penelitian ini adalah untuk mengetahui ukuran celah pelolosan yang sesuai untuk meloloskan rajungan dengan lebar karapas 10 cm serta mampu menahan rajungan dengan lebar karapas >10 cm. Sebanyak 30 ekor rajungan dengan lebar karapas 9-10,8 cm diuji cobakan terhadap tiga ukuran celah pelolosan yang berbeda (4,6 x 2,6 cm; 5 x 3 cm; dan 7 x 2,5 cm), dengan tiga kali ulangan. Uji coba dilaksanakan di laboratorium pada bulan Maret 2020. Hasil penelitian menunjukkan bahwa tidak ada perbedaan tingkat pelolosan rajungan pada ketiga ukuran celah pelolosan. Meski demikian, ukuran 4,6 x 2,6 cm diyakini merupakan ukuran yang paling efektif karena mampu meloloskan rajungan dengan lebar karapas 10 cm (46,9%), serta paling bagus dalam menahan rajungan dengan lebar karapas >10 cm tetap berada di dalam bubu. Percobaan lapang terhadap ukuran celah pelolosan ini pada beberapa perairan diperlukan untuk mengkonfirmasi penggunaannya pada perikanan rajungan.The blue swimming crab (Portunus pelagicus, BSC) is one of fishery commodities caught by passive gears, such as collapsible traps. The use of escape-vent on traps was supposed to comply with the legal size of BSC’s catch declared in the Ministerial Decree 12/2020 (i.e. >10 cm of carapace width). To determine an appropriate escape-vent size which is able to release BSC of 10 cm Carapace Width (CW) and to retain BSC of > 10 cm CW, 30 samples of BSC were tested on three different sizes of escape-vent (4.6 x 2.6 cm; 5 x 3 cm; and 7 x 2.5 cm) with three replications of each size. The results show that there was no significant difference of BSC’s escape rate among the escape-vent sizes. However, the size of 4.6 x 2.6 cm was assumed as the most effective escape-vent as it could release BSC of 10 cm CW (46.9%), and best to retain BSC of >10 cm CW inside the trap compared to other sizes. Field investigation might be needed to confirm the effect of the appropriate escape-vent size of collapsible trap on BSC fishery.

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Reproductive performance of female blue swimming crab (Portunus pelagicus) from some waters in South Sulawesi

Hidayani

Fujaya

Umar

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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Sexual Maturity, Reproductive Pattern and Spawning Female Population of the Blue Swimming Crab, Portunus pelagicus (Brachyura: Portunidae) in East Lampung Coastal Waters, Indonesia

Cited by 4 publications

References 34 publications

Stock Assessment of the Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) in Stock Enhancement Sites of Danajon Bank, Central Philippines

Stock Assessment of the Blue Swimming Crab Portunus pelagicus (Linnaeus, 1758) in Stock Enhancement Sites of Danajon Bank, Central Philippines

UJI LABORATORIUM KESESUAIAN UKURAN CELAH PELOLOSAN PADA BUBU LIPAT TERHADAP TINGKAT PELOLOSAN RAJUNGAN (Portunus pelagicus)

Reproductive performance of female blue swimming crab (Portunus pelagicus) from some waters in South Sulawesi

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