Browsing Conference Proceedings by Subject "Catfishes"

Now showing items 1-4 of 4

    • Series: Special Publication No. 30

      Evaluation of different live food organisms on growth and survival of river catfish, Mystus nemurus (C&V) larvae 

      Laron, M. A.; Kamarudin, M. S.; Yusoff, F. M.; Saad, C.R. (European Aquaculture Society, 2001)
      Mystus nemurus is one of the most commercially important freshwater fish in Malaysia. Even though artificial breeding or reproduction of M. nemurus is done in private hatcheries around Peninsular Malaysia, inadequate seed supply coupled with relatively high fingerling prices limits its production. Presently, the supply of fingerlings cannot satisfy the demand for fish farming due to some constraints on the larval rearing, so larval rearing of M. nemurus has yet to be improved in terms of nutrition requirement and suitable size of food for the larvae. At present, the conventional method of fish larviculture using live food such as Artemia nauplii is being practiced by most Malaysian catfish hatchery operators. Using expensive live food like Artemia has made the mass production of catfish fry/fingerlings less profitable. Alternative measures are necessary in order to help minimize importation and use of Artemia. Indigenous species of live food organisms, which are great potential as feed and can easily be cultured and mass-produced at low cost, may be used as substitutes. Studies on those live foods are lacking, hence this study was conducted to determine the effect of different live foods on growth and survival of Mystus nemurus larvae.

    • Hatchery, nursery and grow-out management of the Asian catfish Clarias macrocephalus 

      Bombeo, Ruby F. (University of the Philippines Aquaculture Society, Inc., 2001)
      The Asian catfish, Clarias macrocephalus is a native but fast disappearing species in the Philippines. It is locally named as hito to Tagalogs, paltat to Ilocanos, pantat to Cebuanos and Ilongos, and Ito to Pampangueños. They are called catfishes because they posses whisker-like structure near their mouth called barbells. Among the Clarias species Clarias macrocephalus is preferred because of its tender and delicious meat. Many people believed that the disappearance of the native catfish is due to interbreeding with Thai catfish, Clarias batrachus and the rampant use of pesticides in the ricefields that "poison" the breeding grounds of this species. At SEAFDEC/AQD, standardized techniques were developed in the laboratory for breeding and seed production of this species. Verification studies are on going on nursery techniques in tanks and ponds and grow out culture in ponds. The topics to be discussed are mostly based on SEAFDEC's research studies and hands-on experiences on the native catfish Clarias macrocephalus.
    • Series: Special Publication; No. 24

      Improved hatchery rearing techniques for the Asian catfish, Clarias macrocephalus (Gunther) 

      Fermin, Armando C.; Bolivar, Maria Edna C.; Balad-on, S. B. M.; Vargas, J. B. (European Aquaculture Society, 1995)
      The Asian catfish, Clarias macrocephalus, is a popular freshwater foodfish in the Philippines. However, grow-out farming of this species is hampered by the lack of juveniles for stocking. A series of experiments on zooplankton feed density, weaning and stocking density were conducted in order to improve production of C. macrocephalus fry in the hatchery.

    • LHRHa and pimozide-induced breeding in the catfish, Clarias macrocephalus (Gunther). 

      Tan, A.M.; Garcia, M.A.; Tan-Fermin, Josefa D.; Gapasin, Rolando S.J.. (1994)
      Clarias macrocephalus is endemaic yet dwinding freshwater foodfish in the Philippines. Induced breeding protocol was developed after a series of studies which determined the appropriate egg size, proper time of stripping females, effective dose combination of luteinizing hormone-releasing hormone analogue (LHRHa) and pimozide (PIM), and their effects on egg quality. Based on its similar osmotic pressure with catfish plasma, eggs were fixed in 1% phosphate-bufferedd formalin. Catfish eggs with a mean diameter of 1.40 - 1.60 mm were responsive to hormonal treatment and increased to 1.50 - 1.70 mm at ovulation. Oocyte maturation, indicated by eggs in the germinal vesicle breadown (GVBD) stage, was observed at least 13 h pst-injection, followed by ovulation 4 h thereafter. Techniques developed in these studies showed a simsle, convenient, and effective way to induce spawning of C. macrocephalus. A simultaneous injetion of 0.05 ųg LHRHa + 1 ųg PIM/g BW at 1800 - 1900 h, followed by stripping at 16 - 20 h post-injection has consistently resulted in 100% ovulation, high fertilization and hatching rates.