Coral reefs may produce as much as 10% of the annual world fish catch. Yet, very little investigation has been done on the biology of coral reef fishes, so that we know little about their growth rates and mortalities, vital parameters in the understanding of their population dynamics and, hence, of their exploitability. The Fourth International Coral Reef Symposium, held in Manila 18-22 May 1981, gave an opportunity to address this problem and, in fact, a significant number of the papers presented did deal with applied fisheries issues.
The issues relating to the management of the coastal zone are multi-faceted and some issues are largely intertwined with policy and development goals in larger administrative units. The natural boundaries of reef resources, the processes that support reef ecosystems, and the local or national affili ation of the people who benefit from them may transcend the boundaries of the local management units. Thus, efforts to arrest the decline in fish catch from and loss of biodiversi ty in reefs require that management interventions and assess-ment activities are carried out at varying scales.
In this study, we aimed to evaluate the efficacy of adding T. niloticus to control epilithic algal biomass and enhance coral recruitment on artificial substrata at a heavily fished reef in northwestern Philippines. Our main hypothesis was that with addition of trochus, the growth of algae would be lower and the number of coral recruits would be higher. The reason for trying to control algal growth through trochus grazing was to reduce preemption of space for settlement of coral larvae.
The article highlights a workshop held in Key West, Florida in November 1993 attended by a group of 35 international scientists where topics of ecosystem function and biodiversity on coral reefs were discussed.
Severe declines in the cover of live hard coral on reefs have been reported worldwide, and in the Caribbean region, the architectural complexity of coral reefs has also declined markedly. While the drivers of coral cover loss are relatively well understood, little is known about the drivers of regional-scale declines in architectural complexity. This study makes use of a dataset of 49 time series reporting reef architectural complexity to explore the effect of hurricanes, coral bleaching and fishing on Caribbean-wide annual rates of change in reef complexity.
Coral reefs are widespread along the east African coast and Seychelle islands. Their roles in island building and coastal protection are often underestimated, they are also important fishery habitats and major tourist attractions. The east African marine fishery production, estimated at 1.4-4.9 tonnes per km super(2), is principally a result of artisanal fishing. Siltation, trampling, and destructive fishing methods are the main cause of coral reef degradation along the east African coast and associated islands.
The degradation of coral reefs has become an issue of global concern. Assessment of the status of coral reefs worldwide requires more empirical information on the location and extent of these biologically and economically important resources. In this paper, the authors propose an international program to mobilize technological resources in support of a Global Inventory of Coral Reefs (GICOR).
Coral reefs are based on a fragile and easily disrupted symbiosis between microalgs.e and coral polyps. The corals, together with macro-algae, form the base of a food web that supports a highly diverse ecosystem. The primary productivity of the system is very high but it is vulnerable to the effects of global warming and environmental degradation caused by physical damage to reefs, by sedimentation and by pollution from plant nutrients, chemical wastes, herbicides, pesticides and oil.
The yellowtail snapper Ocyurus chrysurus is one of the most important and heavily targeted reef fishery species in the Caribbean. In this study, we investigate the first month of post-settlement life in shallow seagrass nursery areas with underwater visual census techniques. We separate early juvenile mortality from movement by answering the following specific questions: (1) Are settlement-stage O. chrysurus resident in seagrass? (2) Do early juveniles maintain a home range and, if so, how does home range vary with fish size? (3) Is such a range stable?
On many corals reefs in the Indo-Pacific, the larger species of giant clams (Tridacnidae) have either been eliminated or fished down to the point where the external fertilization of gametes is improbable. In the mid 1980s, several countries, donors, and regional and international research organizations set out to redress this problem by developing technology to propagate juvenile giant clams in hatcheries and re-establish them in the wild.