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Book (series)Estimating reef habitat coverage suitable for the humphead wrasse, Cheilinus undulatus, using remote sensing. 2010
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No results found.This study evaluates the use of satellite images for mapping shallow reef areas and the habitat of humphead wrasse. A method for mapping the suitable habitat for adult humphead wrasse is developed based on the location of reef edges on available Landsat images and on the application of a buffer area around the edges, where the probability of finding adult humphead wrasse is highest according to Underwater Visual Survey (UVS) data. The method is used to estimate the habitat coverage of the specie s in Indonesia, Malaysia and Papua New Guinea, three of the most important exporting countries of the species. The total estimated habitat coverage was 11 892 km2 in Indonesia, 941 km2 in Malaysia and 5 254 km2 in Papua New Guinea. The estimates for Indonesia and Malaysia are approximately four times smaller than other available estimates of reef coverage for these countries, the difference being explained by the higher accuracy of the method used in the present study in identifying the location of shallow water fringing reefs. It is concluded that, for the purpose of estimating the suitable areas of humphead wrasse as a basis for defining population size and sustainable export quotas, the results obtained in the present study are more conservative and appropriate than previously available estimates of reef areas. -
Book (series)Stock assessment approach for the Napoleon fish, Cheilinus undulatus, in Indonesia
A tool for quotasetting for data-poor fisheries under CITES Appendix II Non-Detriment Finding requirements.
2007Also available in:
No results found.A stock assessment approach for the Napoleon fish (humphead wrasse), Cheilinus undulatus, is presented as a tool for determining sustainable catch levels of the species. The model was developed primarily for application in Indonesia and in collaboration with the Research Center for Oceanography, Indonesian Institute of Sciences (LIPI). The model can be adapted for estimating sustainable catch levels in other countries, if suitable estimates of reef area and fish densities are available . The approach is composed of a population model and a method for estimating stock density based on underwater visual surveys, allows for the representation of "grow out" of net-caged animals, a significant part of the trade, includes the ability to account for uncertainty in most of the parameters of the model, and can compute a sustainable catch (and its associated uncertainty) corresponding to a user-specified level of fishing mortality. The resultant model is implemented using Micros oft EXCEL and Visual Basic, with a graphical user interface for easy use (the EXCEL spreadsheet is included in the CD-Rom provided with this Fisheries Circular). Sustainable fishing mortality rates for the species in Indonesia can be estimated based on commonly used biological reference points (e.g. FMSY; F20%). Results of sensitivity tests indicated that the relationship between stock and recruitment remains the major uncertainty affecting the estimation of sustainable fishing rates. Preliminary estimates of export quotas for Indonesia are provided taking into account the official statistics on the volume of domestic catches and estimated illegal and unreported exports. Estimated export quotas were highly sensitive to the estimated habitat area suitable for the species, which highlights the need for more accurate estimates of reef habitat areas in Indonesia. Quotas depend heavily on successful implementation and are one of several possible approaches to achieving sustainable exports of a CITES Appendix II listed species. -
ProjectReport of the National Workshop on Fisheries Monitoring, Control and Surveillance in support of Fisheries Management
Goa, India 12-17 February, 2001
2001Also available in:
No results found.This document contains the proceedings of a Workshop on fisheries Monitoring, Control and Surveillance held at Goa, India from 12 to 17 February 2001 and most of the papers presented at the Workshop. Two papers describe the situation on MCS and the implementation of the Code of Conduct for Responsible Fisheries in India, one paper describes the MCS situation in Namibia, another that in Malaysia and a third paper reviews the situation in the northern Indian Ocean. The other papers are more technical and cover an introduction to fisheries management, technical, operational, legal and personnel aspects of MCS, Vessel Monitoring Systems and mesh size measurements and regulations. One paper introduces aspects of observer and on-board sampling programmes. Finally an example is given of a SWOT analysis.
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