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?
Parameters of the length–weight relationship of the form W=aLb are presented for 45 demersal fish species caught on the upper continental slope of the Caribbean Sea off Colombia. The b values varied between 2.13 and 4.97, with the mean b = 3.042 (95% CI, 2.887- 3.196).
Many exploited stocks of aquatic organisms are limited by the supply of juveniles and many also suffer from recruitment overfishing. Consequently, there is much interest in stock-enhancement programs, which are aimed at improving harvests by increasing recruitment to levels approaching the carrying capacity of the habitat. Most stock-enhancement programs involve the release of juveniles reared in hatcheries or the collection, rearing, and transplantation of wild juveniles. Optimized release strategies and increased fitness for life in the wild are required.
The maximum sustainable yield of demersal fishery resources in the Gulf of Thailand to a depth of 50 m is estimated to be 750,000 tonnes. On this basis the Gulf has been overfished since 1973. There were over 4,000 trawlers registered in the Gulf in 1972; over 10,000 in 1982. The total catch of food fish has increased only slightly since 1963, most increases being of trash fish. However, the trash fish component includes increasing numbers of juvenile food fish. Trash fish are now mostly processed into fish meal.
This paper consists of four main parts: a) the marine fisheries of Southeast Asia; b) the mathematical models; c)the Gulf of Thailand trawl fishery as a case study; and d) possible new approaches in the study and management of region's fisheries.
In this paper, we document the results of retrospective analysis of length frequency data collected during a trawl survey in Brunei Darussalam from July 1989 to June 1990. The study forms part of concerted efforts under the TrawlBase Project to provide enhanced historical baselines for fisheries management in developing Asian countries, in general, and Brunei Darussalam in particular.
Worldwide, there is serious concern about the state of fisheries; yet for Asia, which accounts for half of the global fisheries production, information on the state of fisheries in order to guide management is sparse. In this paper we review the results of a regional study that examined the state of demersal fisheries resources in the coastal areas of Malaysia, the Philippines and Thailand. In each country time series of scientific trawl survey data (spanning 12–49 years, depending on the area) were used to assess changes in the total biomass of demersal species over time.
Groupers and snappers are important fishery resources of the tropics and subtropics, where their high values have caused most of their stocks to be heavily exploited, some even to the point of collapse. Trends towards heavy demand and decreasing natural supply, which are accelerating in several parts of the world, prompted various mariculture ventures. Focused research on biology and the population dynamics of groupers and snappers, and on their reproduction and growth under controlled condition will remain essential for dealing with the questions on how to better manage their fisheries.
As a (small) contribution toward reestablishing communication between Kuwait-based fishing research and other research conducted elsewhere in the tropics, the growth parameter estimates and the "a" and "b" values of length-weight relationships of 25 fish and three penaeid shrimp species from Kuwait waters are presented, along with the methods used to estimate them. This will hopefully encourage their use in comparative studies of vital statistics offish and shrimp.
The parameters a and b of the length-weight relationship of the form W=aL super(b) are presented for 37 fish species, belonging to 17 families, caught during a demersal trawl survey over the period December 1995 to March 1998 in the Gulf of Salamanca, Colombia