TheEcopathwithEcosim (EwE)modeling approach combines software for ecosystem trophicmass balance analysis (Ecopath), with a dynamic modeling capability (Ecosim) for exploring past and future impacts of fishing and environmental disturbances as well as for exploring optimal fishing policies. Ecosim models can be replicated over a spatial map grid (Ecospace) to allow exploration of policies such a...

Marine protected areas (MPAs) are becoming a favoured management strategy for the conservation of marine biodiversity. We present an analysis of how fishery data from a trawl fishery in northern Australia can contribute to the process of developing a system of candidate MPAs. We investigate ways of using fishing grounds, bioregion and depth information as a means of classifying ecosystems, and ...

Ecosystem-based management of marine resources is a worthy ideal. At present, however, the science is unable to measure and relate the fundamental concepts of diversity, productivity and resilience required for management decisions. Further, we do not have legal or fiscal measures that would allow us to allocate these resources to reserves, fishing quotas or fish farms. A proper appreciation of...

the present study considered the situation of kilka stocks in last decades by using overfished biomass threshold, fishing effort ratio and fishing mortality proxy during 1991-2010. the cpue index of anchovy and mixed-species of kilka indicated an undepleted from 1991 to 2000. in 2000, the cpue ratio declined to close to the “in danger” region, and subsequently collapsed to “overfished” region f...

The objective of this paper was to study angling from September, 2002 to September, 2004 in the Lobo-Broa Reservoir, Itirapina, SP (22 degrees 15' S and 47 degrees 49' W). Interviews (total 1,027) with sport fishers were accomplished in the three main fishing sites (Horto, Píer and Praia). This fishing was practiced with a simple fishing rod and reel, mainly in Horto, where the catches and fish...

Biodiverse coastal zones are often areas of intense fishing pressure due to the high relative density of fishing capacity in these nearshore regions. Although overcapacity is one of the central challenges to fisheries sustainability in coastal zones, accurate estimates of fishing pressure in coastal zones are limited, hampering the assessment of the direct and collateral impacts (e.g., habitat ...

This paper discusses the mechanics and implications of municipal concessions in the Philippines which govern the use of municipal waters for fish corrals, oyster culture beds and gathering of milkfish fry. These concessions or territorial use rights are awarded annually by the resource owner (the municipality) to the highest bidder. In the case of milkfish fry gathering, the concessionaire assu...

Territorial user rights for fisheries are being promoted to enhance the sustainability of small-scale fisheries. Using Chile as a case study, we designed a market-based program aimed at improving fishers' livelihoods while incentivizing the establishment and enforcement of no-take areas within areas managed with territorial user right regimes. Building on explicit enabling conditions (i.e., hig...

Article history: Received 23 December 2006 Received in revised form 9 April 2008 Accepted 29 April 2008 Available online 26 June 2008 The management of marine resources is often impeded by a lack of models to integrate ecological and economic information on exploited populations.We used available biological and economic data for an overexploited population of the leopard grouper (Mycteroperca r...