Fish, fishers and fisheries of the Western Indian Ocean: their diversity and status. A preliminary assessment

Elst, Rudy van der; Everett, B.I.; Jiddawi, Narriman; Mwatha, G.; Afonso, Paula Santana; Boullé, David P.

doi:10.1098/rsta.2004.1492

Cited by 79 publications

(57 citation statements)

References 12 publications

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“…The attraction of these destinations is the increasing political stability of the southern African region in general, and the perceived undisturbed nature of their fish stocks. As a result, evidence suggests that the inshore marine fish resources in these countries, often not the target of artisanal fishers, are subject to increasing fishing pressure (van der Elst, Everett, Jiddawi, Mwatha, Afonso & Boulle 2005, Potts, Childs, Sauer & Duarte, in press). For recreational fisheries to provide a sustainable benefit to local economies in developing countries, it is imperative that the fish populations remain healthy.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and economic contribution of a developing recreational fishery in southern Angola

Potts¹,

Childs²,

Sauer³

et al. 2009

Fisheries Management Eco

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The characteristics and contribution of a developing recreational fishery to the local, regional and national economy of Angola were evaluated in 2006. Annual angling effort was 13 435 h, while the estimated total catch of the three target species [leerfish, Lichia amia (L.), west coast dusky kob, Argyrosomus coronus (Griffiths & Heemstra) and shad, Pomatomus saltatrix (L.)], was 5913 fish with a mass of 27 975 kg. Catch per unit effort (CPUE) for all teleost species combined was 0.44 fish per angler h )1 and 2.08 kg per angler h )1 . Total harvest of the three species was 576 fish with a total mass of 2221.6 kg. The total contribution of this recreational fishery (mostly anglers from South Africa)

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Section: Introductionmentioning

confidence: 99%

Characteristics and economic contribution of a developing recreational fishery in southern Angola

Potts¹,

Childs²,

Sauer³

et al. 2009

Fisheries Management Eco

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“…Although comprising about only 8% of the world's oceans, the WIO provides 4% of the global industrial fish catch, and supports numerous artisanal fishing communities (van der Elst et al. ). Furthermore, there has been a recent escalation in hydrocarbon exploration and production off East Africa (US EIA ), with more to come (e.g., through Operation Phakisa).…”

Section: Introductionmentioning

confidence: 99%

Managing conflicts between economic activities and threatened migratory marine species toward creating a multiobjective blue economy

Harris

Oosthuizen²,

Meyer³

et al. 2018

Conservation Biology

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Harnessing the economic potential of the oceans is key to combating poverty, enhancing food security, and strengthening economies. But the concomitant risk of intensified resource extraction to migratory species is worrying given these species contribute to important ecological processes, often underpin alternative livelihoods, and are mostly already threatened. We thus sought to quantify the potential conflict between key economic activities (5 fisheries and hydrocarbon exploitation) and sea turtle migration corridors in a region with rapid economic development: southern and eastern Africa. We satellite tracked the movement of 20 loggerhead (Caretta caretta) and 14 leatherback (Dermochelys coriacea) turtles during their postnesting migrations. We used movement-based kernel density estimation to identify migration corridors for each species. We overlaid these corridors on maps of the distribution and intensity of economic activities, quantified the extent of overlap and threat posed by each activity on each species, and compared the effects of activities. These results were compared with annual bycatch rates in the respective fisheries. Both species' 3 corridors overlapped most with longline fishing, but the effect was worse for leatherbacks: their bycatch rates of approximately 1500/year were substantial relative to the regional population size of <100 nesting females/annum. This bycatch rate is likely slowing population growth. Artisanal fisheries may be of greater concern for loggerheads than for leatherbacks, but the population appears to be withstanding the high bycatch rates because it is increasing exponentially. The hydrocarbon industry currently has a moderately low impact on both species, but mining in key areas (e.g., Southern Mozambique) may undermine >50 years of conservation, potentially affecting >80% of loggerheads, 33% of the (critically endangered) leatherbacks, and their nesting beaches. We support establishing blue economies (i.e., generating wealth from the ocean), but oceans need to be carefully zoned and responsibly managed in both space and time to achieve economic (resource extraction), ecological (conservation, maintenance of processes), and social (maintenance of alternative livelihood opportunities, alleviate poverty) objectives.

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“…Along the coast of Tanzania, most fisheries occur in inshore waters, are artisanal or subsistence and target a broad range of species from multiple habitats, including estuaries, coral reefs and seagrass meadows (Gullström et al, 2002;van der Elst et al, 2005). Artisanal and subsistence fisheries in Tanzania involve the majority of the coastal population, whose survival depends on marine resources (de Graaf & Garibaldi, 2014).…”

Section: Introductionmentioning

confidence: 99%

Trophic redundancy among fishes in an East African nearshore seagrass community inferred from stable‐isotope analysis

Matich

Kiszka

Gastrich

et al. 2017

Journal of Fish Biology

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Stable-isotope analysis supplemented with stomach contents data from published sources was used to quantify the trophic niches, trophic niche overlaps and potential trophic redundancy for the most commonly caught fish species from an East African nearshore seagrass community. This assessment is an important first step in quantifying food-web structure in a region subject to intense fishing activities. Nearshore food webs were driven by at least two isotopically distinct trophic pathways, algal and seagrass, with a greater proportion of the sampled species feeding within the seagrass food web (57%) compared with the algal food web (33%). There was considerable isotopic niche overlap among species (92% of species overlapped with at least one other species). Narrow isotopic niche widths of most (83%) species sampled, low isotopic similarity (only 23% of species exhibited no differences in δ C and δ N) and low predicted trophic redundancy among fishes most commonly caught by fishermen (15%), however, suggest that adjustments to resource management concerning harvesting and gear selectivity may be needed for the persistence of artisanal fishing in northern Tanzania. More detailed trophic studies paired with information on spatio-temporal variation in fish abundance, especially for heavily targeted species, will assist in the development and implementation of management strategies to maintain coastal food-web integrity.

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Fish, fishers and fisheries of the Western Indian Ocean: their diversity and status. A preliminary assessment

Cited by 79 publications

References 12 publications

Characteristics and economic contribution of a developing recreational fishery in southern Angola

Characteristics and economic contribution of a developing recreational fishery in southern Angola

Managing conflicts between economic activities and threatened migratory marine species toward creating a multiobjective blue economy

Trophic redundancy among fishes in an East African nearshore seagrass community inferred from stable‐isotope analysis

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