includes former title: - Naga: the ICLARM Quarterly

Recent Submissions

  • Utilization of trawl bycatch in Gujarat (India)

    Zynudheen, A.A.; Ninan, G.; Sen, A.; Badonia, R. (2004)
    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.
  • Growth and length-weight parameters of Pacific mackerel (Scomber japonicus) in the Gulf of Guayaquil, Ecuador

    Zenck, E.C. (1999)
    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.
  • Impact of the introduction of apple snails and their control in Japan

    Yusa, Y.; Wada, T. (1999)
    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)
    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)
    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.
  • Spawning and hatching performance of the silvery black porgy Sparidentex hasta under hypersaline conditions

    Yousif, O.M.; Ali, A.A.; Kumar, K.K. (2003)
    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)
    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
  • Trends in the farming of the snakeskin gourami (Trichogaster pectoralis) in Thailand

    Yoonpundh, R.; Little, D. (1997)
    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.
  • Length-weight relationship of Gulf of Thailand fishes

    Yamagawa, H. (1994)
    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.
  • 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)
    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)
    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.
  • Determinants of women's economic participation in the small-scale fisheries sector, Peninsular Malaysia

    Yahaya, J. (1994)
    This paper specifically examines the main determinants of women participation in income-earning activities in Peninsular Malaysian small scale fisheries.
  • On China's lake fisheries development

    Wu, W.; Yang, N.; Jin, L. (1991)
    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.
  • How science serves fisheries management

    Williams, M.J. (1994)
    Roles of science in assisting natural resource management are discussed emphasizing on how science can best serve fisheries and natural resource management objectives.
  • Fisheries production in Asia: its role in food security and nutrition

    Williams, M.J.; Choo, P.S. (2003)
    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.
  • Changing traditions: first global look at the gender dimensions of fisheries

    Williams, M.J.; Nandeesha, M.C.; Choo, P.S. (2005)
    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.
  • River fisheries in Africa: their relationship to flow regimes

    Welcomme, R.L. (2003)
    River fisheries in Africa are important because of their contribution of animal protein to human diets. Such fisheries are highly dependent on hydrological regimes and show considerable year-to-year variation in response to natural climatic events. River flow regimes are being increasingly altered by withdrawals by man, principally for agriculture. The modification of hydrological regimes is leading to diminishing catches of fish and changes in the number and size of the species caught. Given that the trend to remove water from rivers for agriculture and power generation will continue, better appraisals of the impacts of such withdrawals are urgently needed so the policies for water allocation can be better defined. The development of tools to aid in such decision-making is equally important.
  • Low cost light traps for coral reef fishery research and sustainable ornamental fisheries

    Watson, M.; Power, R.; Simpson, S.; Munro, J.L. (2002)
    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)
    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.

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