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Objectives and categories of MPAs
Published in Peter J. S. Jones, Governing Marine Protected Areas, 2014
The aim of conventional fisheries management is to avoid such stock declines and achieve the highest CPUE that can be sustained on a long-term basis, in order to provide for sustainable seafood supply and a profitable industry. This should be achieved by ensuring that fish stocks are maintained at a level which provides a maximum sustainable yield (MSY), recognising that the productivity of a fish stock can be increased by harvesting it but that an overfished stock cannot sustain an excessive harvest. This MSY level is roughly around 50 per cent of the unexploited ‘virgin’ biomass of the stock, though this varies very considerably depending on the attributes and dynamics of the stock in question. Maintaining stocks at a level that can maintain MSY involves regulating not only the amount of fishing effort that is exerted, but also imposing technical restrictions, such as minimum mesh sizes of nets and minimum landing sizes of fish, and restricting the total amount of fish that can be landed, in terms of quota. The concept of MSY has been referred to as the ‘holy grail’ of fisheries management (Larkin, 1977), as it represents a quest for something which some consider can never be found.
On optimal harvesting policy for two economically beneficial species mysida and herring: a clue for conservation biologist through mathematical model
Published in International Journal of Modelling and Simulation, 2023
Prahlad Majumdar, Sabyasachi Bhattacharya, Susmita Sarkar, Uttam Ghosh
The maximum sustainable yield (MSY) is the largest abundance of the species that can be harvested, by ensuring its sustainability. MSY of both the species, viz. herring and mysid, are the greatest yield that can be achieved over time while maintaining the productive capacity of stock [28,29]. The sustainable yield during the equilibrium state is given by