Blue Swimming Crab Stock Assessment in the Western Visayan Sea

Mesa, Sheryll; Bayate, Drusila Esther; Guanco, M.R.

doi:10.31398/tpjf/25.1.2017c0008

Cited by 7 publications

(14 citation statements)

References 2 publications

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“…The study of Mesa et al (2018) corroborated that BSC fishery in Western Visayas is experiencing overfishing in the last several years, as evidenced by decreasing CPUE and intensified fishing pressures. The declining catch of BSC prompted local crab fishers to catch undersized and gravid crabs to increase production and augment their income.…”

Section: Blue Swimming Crab (Bsc)supporting

confidence: 56%

“…These were sold at a lower price resulting in quality loss. Based on the recent stock assessment study conducted by Mesa et al (2018) in the Visayan Sea, the length at first maturity for BSC was estimated at 11.5 cm carapace width. The selling price for larger-sized crabs was between PHP 120 to 320, while undersized can be bought as low as PHP 30-300 per kg.…”

Section: Blue Swimming Crab (Bsc)mentioning

confidence: 99%

“…About 57% and 62% immature sizes were caught by bottom-set gillnets and crab pots, respectively. There are crab pots made of bamboo strips, polyethylene net, or synthetic chicken wires in Western Visayas (Mesa et al 2018). The majority of crab pots have a one-way entrance point designed to accommodate bigger size crabs.…”

Section: Blue Swimming Crab (Bsc)mentioning

confidence: 99%

“…However, even small crabs can enter without the capability to escape (Sara et al 2016). Therefore, Mesa et al (2018) recommended increasing the trap entrance diameter to minimize the retention of unwanted BSC sizes. Collapsible crab pots equipped with escape vents will allow smaller sizes to escape and return to the sea to grow and attain maturity (Sara et al 2016).…”

Section: Blue Swimming Crab (Bsc)mentioning

confidence: 99%

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Assessment of Postharvest Losses Due to Catching Undersized Fishery Commodities and Size-Dependent Pricing in the Philippines

Banicod

Montojo

Tadifa

et al. 2021

TPJF

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The continuing decline in catch rates instigates various fishing adjustments to keep up with the demands of a growing population. Fishery resources are being caught before they can attain their optimum harvestable size. Undersized catch elicits lower economic value; thus, considered as losses in postharvest fisheries. The present study focused on generating actual data on the volume of undersized catches in selected landing sites in the Philippines. It aims to quantify the magnitude of postharvest and financial losses incurred from catching fishery commodities below their marketable sizes. The estimated loss at 0.97% and 4.02% for capture and aquaculture commodities, respectively, was equivalent to PHP 15,235,290 financial loss. Estimation of losses by commodity showed that squid recorded the highest at 20.14%, followed by tilapia (9.61%), blue swimming crab (4.48%), shrimp (2.75%), small pelagics (1.98%), mussel (1.46%), oceanic tuna (0.91%), by-catch (0.79%), milkfish (0.09%), and oyster (0.02%). Excessive catching of undersized BSC and squid in Western Visayas may lead to overexploitation of resources and may adversely affect subsequent recruitment in the long run. The study's results indicate that catching undersized species could lead to substantial postharvest losses and subsequent loss of potential revenue to the industry players. Allowing the stocks to attain their maximum biomass level will minimize postharvest losses; thus, maximizing utilization of resources and benefits derived from the sector. Unrestrained catching of undersized fishery commodities undermines resource sustainability, economic potential, and food security. The strengthening of regulatory frameworks is, therefore, necessary to address both economic and ecological impacts.

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Section: Blue Swimming Crab (Bsc)supporting

confidence: 56%

Section: Blue Swimming Crab (Bsc)mentioning

confidence: 99%

Section: Blue Swimming Crab (Bsc)mentioning

confidence: 99%

Section: Blue Swimming Crab (Bsc)mentioning

confidence: 99%

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Assessment of Postharvest Losses Due to Catching Undersized Fishery Commodities and Size-Dependent Pricing in the Philippines

Banicod

Montojo

Tadifa

et al. 2021

TPJF

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show abstract

“…The BSC catch is steadily declining in volume and crab size. The reduction of blue swimming crab is believed to be due to fishery problems like overharvesting by effective fishing gears, destruction of nursing and breeding ground, crabbing the ovigerous female (Kunsook et al 2014), and laxity in the implementation of regulatory policy to protect the resource (Mesa et al 2018).…”

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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Annual and seasonal environmental drivers of species- and gear-specific catch rates in the Visayan Sea, Philippines

Bacalso

Romagnoni

Mesa³

et al. 2023

Regional Studies in Marine Science

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Blue Swimming Crab Stock Assessment in the Western Visayan Sea

Cited by 7 publications

References 2 publications

Assessment of Postharvest Losses Due to Catching Undersized Fishery Commodities and Size-Dependent Pricing in the Philippines

Assessment of Postharvest Losses Due to Catching Undersized Fishery Commodities and Size-Dependent Pricing in the Philippines

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

Annual and seasonal environmental drivers of species- and gear-specific catch rates in the Visayan Sea, Philippines

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