The traditional shark fisheries of southwest Madagascar: A study in the Toliara region

Mcvean, Angus; Walker, Ryan C. J.; Fanning, Eibleis

doi:10.1016/j.fishres.2006.06.016

Cited by 38 publications

(31 citation statements)

References 3 publications

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“…Few of these activities, however, have been successfully implemented, probably because of a lack of support from local communities to proposed regulations that are mostly designed by external entities (Ranaivomanana 2006). This strategy led to some counterproductive results such as international development organizations promoting shark fisheries, which have made this fishery unsustainable today (McVean et al 2006). Progressively, international conservation…”

Section: Methodsmentioning

confidence: 99%

Participatory assessment of the Toliara Bay reef fishery, southwest Madagascar

Brenier¹,

Ferraris²,

Mahafina³

2012

MCD

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In order to ensure the sustainable management of reef fisheries, it is necessary to obtain data about the impacts of these fisheries on both fish resources and the ecosystems that sustain them. Ecosystem -based surveys provide such information, but are difficult to implement because of high technical, financial and human resource requirements. In this regard participatory assessment methods have the potential to increase the amount of data collected at low cost, while taking advantage of local traditional ecological knowledge. In order to investigate the reef fishery of Toliara Bay, southwest Madagascar, we used participatory fish survey and interview data collected on site.

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Section: Methodsmentioning

confidence: 99%

Participatory assessment of the Toliara Bay reef fishery, southwest Madagascar

Brenier¹,

Ferraris²,

Mahafina³

2012

MCD

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“…Published information for small-scale fisheries is generally sparsely quantified and limited to target species (e.g. Marshall 1997b;McVean et al 2006;Schaeffer 2004). Grey literature, in the form of unpublished theses, governmental and consultancy reports, data collected by NGO's and other such works exist.…”

Section: Elasmobranch Interaction With Small-scale Fisheriesmentioning

confidence: 99%

“…However, catch and landing data are mostly available for the west coast, particularly in the southwestern (Toliara) and northwestern (Mahajunga) regions, where conditions are more favourable for fishing (Cooke 1997;Cripps et al 2015;McVean et al 2006;Robinson and Sauer 2013). Data relating to the volume of elasmobranch catch are scarce.…”

Section: Madagascarmentioning

confidence: 99%

Marine megafauna interactions with small-scale fisheries in the southwestern Indian Ocean: a review of status and challenges for research and management

Temple

Kiszka

Stead

et al. 2017

Rev Fish Biol Fisheries

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In developing regions, coastal communities are particularly dependent on small-scale fisheries for food security and income. However, information on the scale and impacts of small-scale fisheries on coastal marine ecosystems are frequently lacking. Large marine vertebrates (marine mammals, sea turtles and chondrichthyans) are often among the first species to experience declines due to fisheries. This paper reviews the interactions between small-scale fisheries and vulnerable marine megafauna in the southwestern Indian Ocean. We highlight an urgent need for proper documentation, monitoring and assessment at the regional level of small-scale fisheries and the megafauna affected by them to inform evidence-based fisheries management. Catch and landings data are generally of poor quality and resolution with compositional data, where available, mostly anecdotal or heavily biased towards easily identifiable species. There is also limited understanding of fisheries effort, most of which relies on metrics unsuitable for proper assessment. Management strategies (where they exist) are often created without strong evidence bases or understanding of the reliance of fishers on resources. Consequently, it is not possible to effectively assess the current status and ensure the sustainability of these species groups; with indications 123Rev Fish Biol Fisheries (2018Fisheries ( ) 28:89-115 https://doi.org/10.1007 of overexploitation in several areas. To address these issues, a regionally collaborative approach between government and non-governmental organisations, independent researchers and institutions, and smallscale fisheries stakeholders is required. In combination with good governance practices, appropriate and effective, evidence-based management can be formulated to sustain these resources, the marine ecosystems they are intrinsically linked to and the livelihoods of coastal communities that are tied to them.

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“…Amorim et al 1998, Castillo-Géniz et al 1998, McVean et al 2006, White 2007, Morgan et al 2009), with poor records of management in some regions. In particular, C. obscurus and C. plumbeus were subject to intense targeted harvest pressure in the now-collapsed large, coastal shark fishery off the east coast of the USA, where various data sets suggest population declines of up to 64−99% in both species (Cortés et al 2006, Myers et al 2007, Baum & Blanchard 2010.…”

Section: Introductionmentioning

confidence: 99%

Genetic structure and diversity of two highly vulnerable carcharhinids in Australian waters

Geraghty¹,

Williamson²,

Macbeth

et al. 2014

Endang. Species. Res.

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Molecular techniques were employed to investigate genetic structure and diversity in dusky Carcharhinus obscurus and sandbar C. plumbeus sharks in the Indo-Australian region. Tissue samples of 423 C. obscurus and 442 C. plumbeus defined 18 and 11 mtDNA ND4 haplotypes, respectively. For C. obscurus, weak genetic differentiation was detected be tween eastern and western Australian waters (pairwise Φ ST = 0.04437, p < 0.008; pairwise F ST = 0.02403, p < 0.035), suggesting the delineation of 2 independent populations, while patterns of gene flow be tween Australia and Indonesia were inconclusive. Rarefaction analysis, however, indicated that robust population comparisons in these species were reliant on sample numbers >100 at any particular location. Off Australia's temperate east coast, C. obscurus and C. plumbeus exhibited strong similarities in genetic structure, suggestive of similar evolutionary histories in the region. In addition, genetic validation revealed observers to be highly accurate in the identification of both target species in an eastern Australian shark fishery. Our findings contribute valuable information for the management and conservation of both species.

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The traditional shark fisheries of southwest Madagascar: A study in the Toliara region

Cited by 38 publications

References 3 publications

Participatory assessment of the Toliara Bay reef fishery, southwest Madagascar

Participatory assessment of the Toliara Bay reef fishery, southwest Madagascar

Marine megafauna interactions with small-scale fisheries in the southwestern Indian Ocean: a review of status and challenges for research and management

Genetic structure and diversity of two highly vulnerable carcharhinids in Australian waters

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