Approaches to Stock Enhancement in Mangrove-Associated Crab Fisheries

Vay, Lewis Le; Lebata, Ma. Junemie Hazel L.; Walton, Mark; Primavera, Jurgenne H.; Quinitio, Emilia T.; Lavilla‐Pitogo, Celia R.; Parado-Estepa, Fe D.; Rodriguez, Eduard M.; Út, Vũ Ngọc; Nghia, Truong Trong; Sorgeloos, Patrick; Wille, Mathieu

doi:10.1080/10641260701727285

Cited by 35 publications

(9 citation statements)

References 57 publications

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“…Thus, the technical aspects of successful project design and implementation, as previously outlined by Blankenship and Leber (), need to be considered in the context of how the target fishery operates, and how the enhancement initiative can contribute to an effective management strategy. In addition, the often‐complex life histories and population dynamics of the target species (Zohar et al ., ), as well as effects of habitat quality and availability and carrying capacity, need to be investigated (Le Vay et al ., ).…”

Section: Introductionmentioning

confidence: 97%

“…Mud crabs ( Scylla spp.) are an attractive species for evaluation of stock enhancement and hatchery‐based ranching due to the socio‐economic importance of artisanal fisheries and their post‐settlement fidelity to mangrove habitats (Le Vay et al ., ). The main mud crab species present in central Philippines is Scylla olivacea , representing over 95% of all species sampled in previous studies (Walton et al ., ; Lebata et al ., ), and is a burrow‐dwelling mangrove resident that is considered the most strongly mangrove‐associated of the Scylla species (Walton et al ., ).…”

Section: Introductionmentioning

confidence: 97%

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Identifying mangrove areas for fisheries enhancement; population assessment in a patchy habitat

Lebata

Walton

Biñas

et al. 2012

Aquatic Conservation

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1. Small-scale fisheries are an important element of the ecosystem goods and services that mangrove habitats provide, especially to poorer coastal communities that rely most on natural resources, and have similar values to payments for ecosystem services (PES) under carbon-trading schemes.2. In advance of fishery-enhancement trials for the mud crab Scylla olivacea, a mark-recapture study was conducted to estimate population size and turnover in 50 ha of isolated mangrove on Panay Island, Philippines. A total of 811 crabs were released in six sessions with an overall recapture rate of 41.5 AE 3.6%. Population size ranged from 607-1637 individuals.3. There was a high degree of site-fidelity, with 45.5% of recaptures in the same sampling areas as releases. Total mortality was 0.79 month -1 , with fishing mortality accounting for 95% of overall mortality. 4. Von Bertalanffy and Gompertz growth models yielded estimates for L 1 (carapace width) of 117.3 AE 14.7 and 110.6 AE 2.1 mm and for k of 2.16 AE 0.74 and 3.25 AE 0.81, respectively. Crab densities of 12-33 individuals ha -1 in the study area were lower than in other mangrove systems owing to intermittent recruitment, while growth rates indicated no limitation in terms of food supply.5. The study demonstrates that in specific mangrove habitats that are below carrying capacity, there is potential for fisheries enhancement to sustain or increase direct economic benefits from mangrove ecosystems and hence promote community engagement in broader conservation and PES initiatives.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Identifying mangrove areas for fisheries enhancement; population assessment in a patchy habitat

Lebata

Walton

Biñas

et al. 2012

Aquatic Conservation

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“…Scylla serrata is an important local fishery resource with a high commercial value and high growth rate, so it has been targeted for aquaculture throughout the Asian region (Chou and Lee 1997;Keenan 1999b;Triño and Rodriguez 2002;Marte 2003;Wang et al 2005). This crab has also been selected as one of the target species for stock enhancement programmes, with the release of juveniles into natural habitats (Fushimi 1983;Oshiro 1988;Ito 2000;Le Vay et al 2008;Lebata et al 2009). Hatchery technology has been studied in many countries to develop aquaculture and stock enhancement programmes for S. serrata (Heasman and Fielder 1983;Quinitio et al 2001;Hamasaki et al 2002a, b;Suprayudi et al 2002aSuprayudi et al , b, 2004Hamasaki 2003;Marte 2003;Baylon et al 2004;Genodepa et al 2004a, b;Ruscoe et al 2004;Wang et al 2005;Rabbani and Zeng 2005;Davis et al 2005a, b;Holm et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Effects of salinity and dietary n-3 highly unsaturated fatty acids on the survival, development, and morphogenesis of the larvae of laboratory-reared mud crab Scylla serrata (Decapoda, Portunidae)

Dan

Hamasaki

2010

Aquacult Int

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We investigated the effects of feeding rotifers containing various levels of n-3 highly unsaturated fatty acids (n-3HUFA) to Scylla serrata larvae at different developmental stages on their survival, development, and morphogenesis when they were cultured at six salinity levels. The first-, third-, and fifth (last)-stage zoeae and megalopae were reared to first-stage crabs at salinities of 10, 15, 20, 25, 30, and 35%, with three different feeding regimes of rotifers containing different levels of n-3HUFA. The larvae successfully developed to the subsequent stages at 20-35% salinity. The highest survival rates to first-stage crabs were recorded at 20-25% salinity. The morphological features of the megalopa observed in the last-stage zoeae, represented by the ratio of the chela length to carapace length, tended to advance with increasing salinity, indicating higher assimilation efficiency at higher salinities. The megalopal features of the last-stage zoeae were enhanced when the larvae were fed rotifers containing higher amounts of docosahexaenoic acid (DHA). As reported previously, final-stage zoeal larvae with advanced megalopal features often experienced moult death syndrome (MDS). These results show that when larvae are fed rotifers with high DHA under high-salinity conditions, morphogenesis is accelerated, resulting in MDS. Therefore, to evaluate the effects of salinity on larval survival, it is necessary to examine larval morphogenesis in terms of MDS. In conclusion, we recommend that not only survival but also larval morphogenesis should be examined when evaluating the results of rearing experiments with S. serrata larvae.

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“…Crab species in estuarine habitats are at high risk of being targeted by illegal fishing because they offer good financial incentives, are often an easily accessible resource and require little gear investment to harvest (Butcher, Leland, Broadhurst, Paterson & Mayer, ; Petrossian, Weis & Pires, ; Petrossian, ). The giant mud crab, Scylla serrata (Forsskål), and the blue‐swimmer crab, Portunus pelagicus (L.), are two examples of economic and socially important estuarine species in many tropical and subtropical regions across the Indo‐West‐Pacific (Mgaya & Chande, ; Le Vay et al., ; Mirera, Ochiewo, Munyi & Muriuki, ; Alberts‐Hubatsch et al., ). Due to rapid increases in market demand, fishing effort for these crabs (using baited traps) across their range has drastically increased over the last few decades (Mirera, ; Alberts‐Hubatsch et al., ).…”

Section: Introductionmentioning

confidence: 99%

Drones detect illegal and derelict crab traps in a shallow water estuary

Bloom

Butcher

Colefax

et al. 2019

Fisheries Management Eco

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The issues surrounding illegal, unregulated and unreported fishing, and that of abandoned, lost and discarded fishing gears, leading to ghost fishing, are intensifying. Estuarine crab trapping is likely subject to high levels of illegal and potential ghost fishing, because it also has good economic incentives regarding potential catch, low gear acquisition costs and accessible fishing grounds. To improve the efficiency and effectiveness of fisheries monitoring, control and surveillance operations, the efficacy of small consumer‐grade drones for sighting traps in an estuary in NSW, Australia, was tested. Twelve sets of two flights were undertaken at 20 and 30 m altitude over a 600‐m stretch of estuary for 5 days to quantify the detectability of submerged mesh traps of three different mesh colours. The drone was able to detect the majority of traps efficiently, with depth in relation to water clarity being the main factor affecting detection. In shallow water, detection rates were high for all mesh colours, but in the slightly deeper placements, orange traps were more readily detected. This study demonstrates that drones could be an efficient and reliable tool for rapidly assessing areas for illegal and derelict traps and can be supplemented into land or vessel‐based fisheries operations.

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Approaches to Stock Enhancement in Mangrove-Associated Crab Fisheries

Cited by 35 publications

References 57 publications

Identifying mangrove areas for fisheries enhancement; population assessment in a patchy habitat

Identifying mangrove areas for fisheries enhancement; population assessment in a patchy habitat

Effects of salinity and dietary n-3 highly unsaturated fatty acids on the survival, development, and morphogenesis of the larvae of laboratory-reared mud crab Scylla serrata (Decapoda, Portunidae)

Drones detect illegal and derelict crab traps in a shallow water estuary

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