Now showing items 1-20 of 571

    • Utilization of trawl bycatch in Gujarat (India)

      Zynudheen, A.A.; Ninan, G.; Sen, A.; Badonia, R. (2004)
      Naga, Worldfish Center Quarterly
      Bycatch from trawlers forms a signifi cant quantity of the total marine fi sh landings along the northwest coast of India, particularly in the state of Gujarat, which contributes about 23 percent of the total marine fi sh landings in the country. This paper discusses the composition of this bycatch, its signifi cance in terms of nutritional value, its present utilization pattern and the scope for improvement.
    • Impact of the introduction of apple snails and their control in Japan

      Yusa, Y.; Wada, T. (1999)
      Naga, the ICLARM Quarterly
      The apple snail, Pomacea canaliculata, was imported into Japan and cultured extensively for food in the early 1980s. Not long after, escaped or discarded snails became feral and started feeding on rice seedlings and other aquatic plants. This was especially noted in Kyushu in southern Japan. Snails are still proliferating, but the area of damaged rice is not increasing as fast, mainly because of the success of snail control. Currently, the most effective methods of avoiding damage to rice are keeping water shallow, transplanting older seedlings and, in some cases, using molluscicides or repellents. However, these methods have almost no effect on damage by snail feeding when rice fields are flooded. The apple snail is believed to be the most important obstacle to the spread of direct-sowing culture of rice in Kyushu. The Ministry of Agriculture, Forestry and Fisheries has launched a national project for the integrated management of the snail under direct sowing culture of rice in Kyushu. The Ministry of Agriculture, Forestry and Fisheries has launched a national project for the integrated management of the snail under direct-sowing rice culture. Some recent results from this project are briefly reviewed in this paper.
    • Socioeconomic characteristics of payang seine (lampara) and driftnet fisheries in West Sumatra, Indonesia

      Zen, L.W.; Tai, S.Y.; Raja Abdullah, N.M. (2000)
      Naga, the ICLARM Quarterly
      A proportionate random sample survey of 10 percent of the driftnet and Payang seine fishers in West Sumatra was carried out in 1998. A total of 45 driftnet and 66 lampara fishers were interviewed to obtain socioeconomic data on the fisheries. About 40 percent of the driftnet and 76 percent of the lampara fishers owned and operated their fishing vessels and gears indicating a high level of ownership of fishing assets by these small scale fishers. The lampara catches consisted mainly of eastern little tuna, skipjack tuna, yellow fin tuna and mackerel, while the driftnets caught mainly Spanish mackerel, Indian mackerel, eastern little tuna and scad.
    • Coral spawning information

      Yusuf, Y.; Noordeloos, M.; Oliver, J. (2003)
      Naga, Worldfish Center Quarterly
      Information on reproduction in reef corals is presented. An understanding of its reproductive behaviour is an important factor in helping to preserve the coral reef ecosystems.
    • Growth and length-weight parameters of Pacific mackerel (Scomber japonicus) in the Gulf of Guayaquil, Ecuador

      Zenck, E.C. (1999)
      Naga, the ICLARM Quarterly
      The seasonally oscillating growth parameters and length-weight relationships for Scomber japonicus caught in the Gulf of Guayaquil, Ecuador, were determined based on length-frequency data from 1989 to 1996, using the FiSAT software package of Gayanilo et al. (1996). Estimates of growth parameters are in general agreement with previous studies on the same species. Results also imply that the growth of Scomber japonicus slows down during the cold season by approximately 50% with respect to the average growth. The mean value of the power b is significantly larger than 3, indicating that the model of allometric growth should be used for the length-weight relationship and calculation of the condition factor.
    • Trends in the farming of the snakeskin gourami (Trichogaster pectoralis) in Thailand

      Yoonpundh, R.; Little, D. (1997)
      Naga, the ICLARM Quarterly
      The production of snakeskin gourami (Trichogaster pectoralis) from wild stocks and traditional culture systems has been declining in central Thailand, although they are on the increase in modern culture practices adopted in some provinces. Net yields of T. pectoralis in traditional systems are about a third of those in modern systems. The potential of T. pectoralis as a candidate for more intensive waste-fed polyculture appears promising if seed supply constraints can be removed.
    • Spawning and hatching performance of the silvery black porgy Sparidentex hasta under hypersaline conditions

      Yousif, O.M.; Ali, A.A.; Kumar, K.K. (2003)
      Naga, Worldfish Center Quarterly
      Abu Al Abyad island is characterized by harsh environmental conditions. A preliminary trial conducted at the island to investigate the spawning and hatching performance of the blue finned sea bream Sparidentex hasta indicated that the fish can be successfully bred at high salinity levels exceeding 50 ppt.
    • Use of enriched live prey in promoting growth and maturation of tiger shrimp (Penaeus monodon)

      Yong, S.K.A.; Mustafa, S.; Rahman, R.A. (2004)
      Naga, WorldFish Center Quarterly
      This study was undertaken to determine the effect of nutritional management of broodstock of Penaeus monodon on growth and maturation. Test specimens were obtained from a grow-out pond before attainment of maturity and were reared in hatchery tanks. Four types of dietary treatments (M1–M4) were given to separate batches that were run in duplicate. Feeding trials continued for five months. A diet with live bloodworm, bioencapsulated to contain tricalcic phosphate as its major component, was found to be the most efficient. Specimens of this particular batch assimilated food more efficiently, grew at a faster rate and attained maturity earlier than other groups. Bloodworm provided the lipid fractions for which there is no de novo synthesis in shrimp. The enrichment product acted by promoting somatic growth and increasing transfer of biochemical constituents needed by the ovary for develop
    • Length-weight relationship of Gulf of Thailand fishes

      Yamagawa, H. (1994)
      Naga, the ICLARM Quarterly
      The length-weight relationship of 26 fish species belonging to 17 families obtained from the Gulf of Thailand was examined. As seven species were obtained from different survey periods and three were from two different locations, seasonal and geographic variations of the equation between body weight W and total length L, W = aL super(b), were examined. The b values of the 27 species were tested for their significant differences from the value of 3; this confirmed that a few species showed significant differences of b value from 3. It is suggested that the 'cube law (b = 3)' can be applied to the length-weight relationship of most fishes in the Gulf of Thailand, with a few exceptions. This was confirmed by the analysis of b values from 72 additional species from the South China Sea area.
    • Determinants of women's economic participation in the small-scale fisheries sector, Peninsular Malaysia

      Yahaya, J. (1994)
      Naga, the ICLARM Quarterly
      This paper specifically examines the main determinants of women participation in income-earning activities in Peninsular Malaysian small scale fisheries.
    • Portable canvas tanks for culture of hybrid catfish (Clarias gariepinus x Clarias macrocephalus) by small-scale farmers in Malaysia

      Yaakob, W.A.A.; Ali, A.B. (1994)
      Naga, the ICLARM Quarterly
      This paper describes the trials made with a simple portable canvas-tarpaulin tank system developed at the University Sains Malaysia for culture of hybrid catfish (Clarias gariepinus x Clarias macrocephalus) by Malaysia small scale farmers.
    • Simple method for backyard production of snakehead (Channa striata Bloch) fry

      Yaakov, W.A.A.W.; Ali, A.B. (1992)
      Naga, the ICLARM Quarterly
      The snakehead (Channa striata ) is a common freshwater fish species in Malaysia. Details are given of a simple technique for breeding this species, suitable for small-scale farmers practising backyard aquaculture. Two techniques were used to induce spawning - the first used water level manipulation to simulate rain and the second used injected with human chorionic gonadotropic hormone. The former, more natural, spawning technique was found to provide a viable alternative for the small-scale farmer, being much simpler than hormone injection.
    • On China's lake fisheries development

      Wu, W.; Yang, N.; Jin, L. (1991)
      Naga, the ICLARM Quarterly
      An account is given of the current situation regarding the lake fisheries and fish culture practices in China. The modern lake fisheries take advantage of the 3-D spaces of lakes to fully develop the resources. Currently, the fisheries concentrate on the following 3 aspects: bringing the water body into full play; various types of aquaculture enclosures; and selective measures in resources protection, stocking and aquaculture.
    • Fisheries economics at Portsmouth Polytechnic, UK

      Whitmarsh, D. (1986)
      Naga, the ICLARM Quarterly
    • How science serves fisheries management

      Williams, M.J. (1994)
      Naga, the ICLARM Quarterly
      Roles of science in assisting natural resource management are discussed emphasizing on how science can best serve fisheries and natural resource management objectives.
    • Changing traditions: first global look at the gender dimensions of fisheries

      Williams, M.J.; Nandeesha, M.C.; Choo, P.S. (2005)
      Naga, Worldfish Center Quarterly
      The Asian Fisheries Society and the WorldFish Center conducted the first ever Global Symposium on Gender and Fisheries in Penang, Malaysia, from 30 November to 4 December 2004. The two-day Symposium, held in conjunction with the 7th Asian Fisheries Forum, attracted 30 papers by over 100 authors and strong audience discussions that covered countries from Kiribati, through Asia Pacific, Africa, Europe and to the Arctic. The flavor of the Symposium was of changing traditions and recognition of the contributions of different groups to fisheries.
    • Fisheries production in Asia: its role in food security and nutrition

      Williams, M.J.; Choo, P.S. (2003)
      Naga, Worldfish Center Quarterly
      This paper reviews the status and some management issues of fisheries production in Asia, as well as the supply and demand situation. Its food security and nutritional roles and opportunities for value addition are also discussed.
    • Development, use and management of the Zhoushan fishing ground, China

      Wang, Q.; Yu, C.D. (1992)
      Naga, the ICLARM Quarterly
      The Zhoushan fishing area contains the Zhoushan archipelagos, whose population is nearly 1 million, including over 300,000 fishermen. A detailed account is given of the environment and its resources; there are more than 300 species of fish, over 60 species of shrimp, more than 10 species of crab and more than 50 species of algae in the area. The history of fishery development in the area is described, outlining motorization, technology, and education. Various regulations and management activities, implemented in the 1980s, are highlighted.
    • Low cost light traps for coral reef fishery research and sustainable ornamental fisheries

      Watson, M.; Power, R.; Simpson, S.; Munro, J.L. (2002)
      Naga, the ICLARM Quarterly
      Two relatively inexpensive light traps to capture pre-settling reef fish and invertebrates are described. A trap made from a plastic bucket (with plastic bottles, a small plastic waste bin and two sheets of plywood) that costs US$15 appears to be just as effective as a large aluminium and plexiglass trap that costs US$275.
    • The small pelagic Rastrineobola argentea: successful survivor in Lake Victoria

      Wanink, J.R. (1996)
      Naga, the ICLARM Quarterly
      The small cyprinid dagaa (Rastreneobola argentea) is the only indigenous species from Lake Victoria which still supports an important fishery after the population boom of the introduced Nile perch (Lates niloticus), while at the same time it is a major prey species of the perch. The observed life-history tactics and the shift from juvenile to adult exploitation mortality made dagaa a successful survivor in a disrupted ecosystem. Although the prospects for a sustainable fishery are good, the current increase in the use of mosquito seines is dangerous. Not only do mosquito seines yield a lower catch per unit of effort than alternative gear, but they also show a strong selection for juvenile dagaa.