Rebuilding Global Fisheries

After a long history of overexploitation, increasing efforts to restore marine ecosystems and rebuild fisheries are under way. Here, we analyze current trends from a fisheries and conservation perspective. In 5 of 10 well-studied ecosystems, the average exploitation rate has recently declined and is now at or below the rate predicted to achieve maximum sustainable yield for seven systems. Yet 63% of assessed fish stocks worldwide still require rebuilding, and even lower exploitation rates are needed to reverse the collapse of vulnerable species. Combined fisheries and conservation objectives can be achieved by merging diverse management actions, including catch restrictions, gear modification, and closed areas, depending on local context. Impacts of international fleets and the lack of alternatives to fishing complicate prospects for rebuilding fisheries in many poorer regions, highlighting the need for a global perspective on rebuilding marine resources. [1]

Towards sustainability in world fisheries

Fisheries have rarely been ‘sustainable’. Rather, fishing has induced serial depletions, long masked by improved technology, geographic expansion and exploitation of previously spurned species lower in the food web. [2]

Beach clam fisheries

The biology, ecology, and fisheries of 15 species of clam from exposed ocean beaches are reviewed and contrasted. The species, representative of four families of bivalves, are Tivela stultorum and Siliqua patula from North America, Tivela mactroides, Donax denticulatus and D. striatus from the Caribbean, Mesodesma mactroides and M. donacium from southern South America, Donax trunculus from Europe, D. serra from southern Africa, D. cuneatus and D. faba from Asia, Donax deltoides from Australia, and Paphies ventricosa, P. subtriangulata and P. donacina from New Zealand. These clams tend to fall into two categories: generally larger temperate species that dominate the macrofauna community biomass on beaches of the dissipative type, and generally smaller tropical species, mostly donacids, found on reflective beaches. Some species have intertidal distributions, but most are centred in the swash zone or shallow subtidal. [3]

Community-based Fisheries Management Approach Adopted in Bangladesh

Aims: To promote the sustainable use of inland fisheries resources by empowering communities to manage their own resources.

Study Design: An investigation in the impact of the nationwide Community Based Fisheries Management (CBFM) approach to determine whether or not the approach was successful with respect to the management of floodplain-river fishery. [4]

Empirical Yield-effort Models for Bangladesh Inland Fisheries

Aims: To support community-based fisheries management (CBFM) of inland fisheries resources in Bangladesh.

Study Design: An investigation into the impact of the nationwide CBFM Project and four alternative yield-effort models were fitted to the catch (yield) and effort data.

Place and Duration of Study: The study comprised community managed fisheries (sites) located in five different inland water habitat types in Bangladesh for the period 1997-2005. [5]

 

 Reference

[1] Worm, B., Hilborn, R., Baum, J.K., Branch, T.A., Collie, J.S., Costello, C., Fogarty, M.J., Fulton, E.A., Hutchings, J.A., Jennings, S. and Jensen, O.P., 2009. Rebuilding global fisheries. science325(5940), pp.578-585.

[2] Bruinsma, G.M., Van der Mei, H.C. and Busscher, H.J., 2001. Bacterial adhesion to surface hydrophilic and hydrophobic contact lenses. Biomaterials22(24), pp.3217-3224.

[3]  McLachlan, A., Dugan, J.E., Defeo, O., Ansell, A.D., Hubbard, D.M., Jaramillo, E. and Penchaszadeh, P.E., 1996. Beach clam fisheries. Oceanography and marine biology: an annual review.

[4]  Halls, A.S., Mustafa, M.G. and Dickson, M., 2017. Community-based fisheries management approach adopted in Bangladesh.

[5]  Halls, A.S. and Mustafa, M.G., 2017. Empirical yield-effort models for Bangladesh inland fisheries.

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