A mass-balance model of the trophic structure of San Pedro Bay, Leyte Province, Philippines was constructed using the Ecopath modeling software. The model is composed of 16 ecological groups (13 consumer, 2 producers, 1 detritus groups). The input parameters were obtained from the resource assessments studies conducted in 1994 - 95 and the biomass of Leiognathidae, an important group of small demersal fishes was estimated from trawl survey data using the swept- area method. The model indicated that the average trophic level of the fishery catches is 3.25.
This paper presents the results of analyses of demersal fish assemblages in various fishing grounds in the Philippines. Data from exploratory trawl surveys conducted in 1947 - 49 show that the 24 fishing grounds covered by the survey can be arranged along a gradient of substrate type (i.e. relative coral cover and sediment characteristics). These may be used to determine the species commonly caught in these grounds. A trend of increasing catch rates with decreasing water depth and increasing proportion of mud in the substrate was noted.
A trophic model of the marine fisheries resources of the north coast of Central Java, Indonesia was constructed using the Ecopath with Ecosim software and data from a trawl survey conducted in the area in 1979. The model consists of 27 ecological groups with a mean trophic level of 3.04. The exploited fishery was then a moderately mature and relatively stable system. The impact of the fishery at the time was low to moderate in comparison with the fisheries in other systems and notably in later time periods.
The fishing industry in the Philippines was tantamount to a marine capture fishery in the 1950s to 1960s. Aquaculture and inland fishery production were not significant. Only during the 1970s did aquaculture and inland capture fisheries contribute significantly to fish production. From 250 000 t fish production in 1951, this increased substantially to 1.6 million t in the 1990s. An average 4.3% was contributed by fisheries to the gross domestic product from 1988 - 98. Fisheries export earnings reached P12 billion in the 1990s.
Indonesia’s fisheries exports rose from 2 206 t in 1970 to 598 385 t in 1996 with a subsequent export value rise from US$0.69 billion to US$1.78 billion. The surplus in the balance of trade (BOT) was US$1.59 billion in 1996. The fisheries exports were predominantly shrimp, tuna, skipjack and demersal fishes. Large scale fisheries operations are prevalent in the Java Sea. The dominant fishing gear is hook-and-line (40%), gillnet (31%), traps (10%), seine net and lift-net (6%), purse seine (1%), shrimp net with BED (0.04%) and others (6%). The large scale fisheries e.g.
This article (in Tagalog) briefly describes the intensive multidisciplinary 3 year research project conducted by the University of the Philippines and ICLARM to document the conditions of the fisheries and fishing communities of San Miguel Bay (Philippines) so that these communities could be integrated into the development planning of the Bicol River Basin Development Project. The research project had three parts, biology, economics and sociology.
Assessments made of shrimp catches in Kuwait and available stocks indicate that finfish eat a large majority of theshrimp available. Management measures to be taken in order to reduce this predation problem are considered.
Fishery statistics for the industrial trawl fishery of Cote d'Ivoire have been well documented since 1968. However, data processing has changed significantly with time and some of the data files have been lost. In 1997, the Centre de Recherches Oceanologiques d'Abidjan decided to retrieve and process all trawl data available from different sources. This paper gives an overview of the database covering the period 1968 to 1997 and describes its coverage, format, structure and use.
This paper reviews the available data on San Miguel Bay fisheries and their history, and contrasts "small-scale" and "trawl" fisheries, each of which land about half of the Bay's total catch of 15000 t / year. On the basis of historical trawl data, it is shown that the trawlable biomass in the Bay declined in the period from 1947 to 1980/81 to less than 20% of its original value, while total effort by the motorized fleet increased by more than 150 times from 120 horsepower in 1936 to the present value of 18800 hp.
Marine fisheries are an important source of protein, livelihood and export earnings for the Philippines. In 1994, totalmarine fisheries catch was 1.67 million t (62% of total fisheries production) valued at about US$1.65 billion. Ofthis total, 277 thousand t were demersal fishes, 885 thousand t small pelagics, 305 thousand t tunas and 203 thousand t other species or groups. Current catches have leveled off since 1991 (at a level near estimated maximum sustainable yield) and existing fishing effort is clearly too high.