Now showing items 2680-2699 of 3378

    • magazineArticle

      S. guttatus and S. vermiculatus - ready for adoption? 

      Southeast Asian Fisheries Development Center, Aquaculture Department - Aqua Farm News, 1994 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Conference paper

      Sabalo spawning 

      This paper is a brief presentation on the status of natural and artificial reproduction of bangos and a recommendation on general approaches researchers may take in solving fry needs while working toward bangos domestication. As with all other aspects of bangos biology and life history, science has surprisingly very little knowledge about spawning and reproduction. Essentially, no new information has been generated since Schuster's (1960) synopsis.
    • magazineArticle

      Safer moorings 

      Southeast Asian Fisheries Development Center, Aquaculture Department - Aqua Farm News, 1994 - Aquaculture Department, Southeast Asian Fisheries Development Center
      The article presents pointers to achieve a safer mooring system.
    • Article

      Salinity effect on the embryonic development, larval growth and survival at metamorphosis of Placuna placenta Linnaeus (1758) 

      JA Madrones-Ladja - Aquaculture, 2002 - Elsevier
      The effects of salinity on the embryonic development, growth, and survival of D-larvae to plantigrade as well as settling in Placuna placenta were studied. Embryos were developed to D-larvae of shell length (SL) 86±12 μm (SL±S.D.) after 20 h at salinities of 22–34 ppt, but not at lower salinity levels. Percentage production of straight-hinged larvae from fertilized eggs at these salinities ranged from 51% to 63% (P≥0.05). P. placenta larvae survived and settled in salinities of 16–34 ppt. Settlement occurred first (14 days) in salinities of 22–34 ppt and later (19 days) in 16 ppt when SL≥200 μm. Larval size at metamorphosis was not significantly different among these salinities (P≥0.05). Percentage survival of plantigrades at 34 ppt (13%) was significantly higher (P≤0.05) than at 16 ppt (4.5±3%), but not greater than at 22 (6.3±3%) or 28 ppt (7±4%) salinity. The best salinity levels for embryonic development and larval survival at metamorphosis ranged from 22 to 34 ppt and larval growth from 16 to 34 ppt. The tolerance of P. placenta to lower and higher salinities progressively increased as larvae develop from embryo to the plantigrade stage.
    • Article

      Salinity preference of the milkfish Chanos chanos Forskal 

      JV Juario & C Dueñas - SEAFDEC Aquaculture Department Quarterly Research Report, 1977 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Extended abstract only.
    • Article

      Salinity tolerance of fertilized eggs and yolk-sac larvae of the rabbitfish Siganus guttatus (Bloch) 

      PS Young & CE Dueñas - Aquaculture, 1993 - Elsevier
      Among naturally spawned and hormonally induced eggs of Siganus guttatus, salinity levels, at which at least 90% of the eggs hatched, ranged from 7 to 67 ppt for naturally spawned eggs and from 9 to 67 ppt for hormonally induced eggs. Salinity levels at which naturally spawned eggs yielded at least 50% normal larvae ranged from 7 to 62 ppt; salinity levels providing at least 90% normal larvae ranged from 10 to 51 ppt. Salinity levels at which 50% larvae survived for 12 h after hatching ranged from 10 to 45 ppt, and for 24 h after hatching, from 14 to 37 ppt. From the results, it is recommended that the incubation salinity of S. guttatus be within the range 10–51 ppt, and for yolk-sac larval maintenance, within the range 14–37 ppt.
    • Article

      Salinity tolerance of larvae of the mangrove red snapper (Lutjanus argentimaculatus) during ontogeny 

      CB Estudillo, MN Duray, ET Marasigan & AC Emata - Aquaculture, 2000 - Elsevier
      Salinity tolerance and the effects of salinity on growth, condition factor and chloride cell (CC) densities were evaluated for Lutjanus argentimaculatus larvae during ontogeny. Tolerance of L. argentimaculatus larvae to abrupt changes of salinity from 32 ppt varied with age. Periods to 50% mortality (LT50) were significantly (P<0.05) longer for 0-day-old larvae than for 7-, 14- and 21-day-old larvae. Tolerance of abrupt salinity change increased remarkably, starting on day 28. Although abrupt transfer to test salinities caused substantial mortalities, L. argentimaculatus larvae, regardless of age (0-, 7-, 14-day-old), showed significantly longer LT50 when abruptly transferred to 8 and 16 ppt than for transfers to 24 and 40 ppt (P<0.05). Growth of L. argentimaculatus larvae at 16, 24, 32 (control) and 40 ppt was not significantly different either at the end of the first rearing phase (days 0–21) or second phase of rearing (days 22–50). Survival was significantly lowest at 40 ppt (4.3%) at the end of first phase of rearing (P<0.05). There were no significant differences in survival rates at the end of the second phase of rearing; however, the condition factor (K) of larvae reared at lower salinities was significantly higher than that of fish at 40 ppt (P<0.05). Gill epithelia of 42- and 50-day-old larvae showed increasing density of CC with increasing salinity.
    • Conference paper

      Salt tolerant Nile tilapia production: Prospects in aquaculture 

      RV Eguia & MRR Romana-Eguia - In MC Remany & J Kumar (Eds.), Proceedings of the India Tilapia Summit 2014 and 2nd Edition of the Dr. E. G. Silas Endowment Lecture, 18th December 2014, Vijayawada, India, 2016 - Rajiv Gandhi Centre for Aquaculture (MPEDA)
      In the Philippines, salt tolerant Nile tilapia strains have been developed and promoted for culture to increase tilapia production in brackishwater pond systems previously dedicated for milkfish and/or penaeid shrimp culture. This was mainly done to address the decline in the production of such major commodities in ponds and/or cages brought about by diseases and mass fish kills caused by intensified culture methods. The present paper focuses on the different salt tolerant Nile tilapia stocks that have been developed and disseminated in the Philippines, the culture practices involved, as well as the prospects for profitable production of Nile tilapia in saline conditions.
    • Conference paper

      The saltwater system at the Tigbauan Research Station of the Southeast Asian Fisheries Development Center, Aquaculture Department. 

      SRA Tillo - In Report of the National Consultative Meeting on Aquaculture Engineering, 2-5 October 1985, Tigbauan, Iloilo, Philippines, 1986 - ASEAN/UNDP/FAO Regional Small Scale Coastal Fisheries Development Project
      Constructed in 1974, the present saltwater system of the SEAFDEC/AQD Tigbauan Research Station (TRS) consists of five pumps, two sump pits, a buffer, sedimentation and filtration treatment system (BSF), an intake pipe, and a distribution system. Two pumps operate at a time, one to bring in water from the sea to the BSF and the other to pump filtered water to distribution lines. Backwashing is provided. The pumps are operated 24 hours a day. Distribution lines are made of PVC pipes which are buried to protect them from direct sunlight. For even pressure, closed loop pipe connection is employed. Preventive maintenance undertaken to ensure continuous operation includes the intake pipe, sump pits, BSF, pumps and distribution lines. Construction of a similar system is expensive and maintenance cost is high. An intake structure patterned after the Underground Dr Concept is proposed as an alternative.
    • Conference paper

      Sampling and stocking density studies for Artemia production in ponds 

      NA Jumalon & RE Robles - In GL Rogers, R Day & A Lim (Eds.), Proceedings of the First International Conference on Warm Water Aquaculture-Crustacea, held on the Brigham Young University Hawaii Campus, February 9-11, 1983, 1983 - Brigham Young University Hawaii Campus
      This study is conducted to develop a sampling program and to determine the optimum stocking density for Artemia production in earthen ponds.
    • magazineArticle

      Sandfish culture technology developed 

      M Castaños - Agriculture Magazine, 2011 - Manila Bulletin Publishing Corporation
    • magazineArticle

      Sandfish: Profitable sea cucumbers also supply bioremediation 

      MT Castaños, RV Ledesma, KG Corre & EG de Jesus-Ayson - Global Aquaculture Advocate, 2011 - Global Aquaculture Alliance
      Sandfish, a type of sea cucumber, are both a high-value culture species and one that supports the aquaculture of other fish species by cleaning up waste on the bottoms of ponds or sea cages. Hatchery and nursery technologies for sandfish are being continuously refined by Vietnam’s Research Institute of Aquaculture No. 3, the Southeast Asian Fisheries Development Center and their partners. These technologies have also been initially transferred to the private sector through a training course and manual.
    • Article

      Sargassum studies in Currimao, Ilocos Norte, Northern Philippines I. Seasonal variations in the biomass of Sargassum carpophyllum J. Agardh, Sargassum ilicifolium (Turner) C. Agardh and Sargassum siliquosum J. Agardh (Phaeophyta, Sargassaceae) 

      AQ Hurtado & AR Ragaza - Botanica Marina, 1999 - Walter de Gruyter
      Three species of Sargassum (S. carpophyllum, S. ilicifolium and S. siliquosum were collected each month for a period of one year from the inter- and subtidal zones of Pangil, Currimao, Ilocos Norte, The Philippines. Average monthly biomass was species-specific and significantly influenced by the effect of fertility states of the seaweed, collecting zone, and collecting months. A higher biomass of reproductive plants was accounted for in all species in both zones. Among the three species, S. siliquosum had the highest reproductive and vegetative biomass in both zones, followed by S. carpophyllum and S. ilicifolium. Maximum fertility was observed in October for S. carpophyllum and in November for S. ilicifolium and S. siliquosum. Minimum and maximum reproductive biomass was recorded in May and December, respectively in all species. Biomass of vegetative or non-fertile plants was highest in September in all species except for S. carpophyllum, while minimum biomass was recorded in March for S. carpophyllum and May for S. ilicifolium and S. siliquosum. Reproductive plants had more biomass than vegetative plants.

      The average monthly wet biomass (g m−2) of other Sargassum species was higher in the subtidal than in the intertidal zone. The biomass of seaweeds associated with Sargassum did not follow a definite pattern. Although water temperature, pH and salinity values were relatively constant, slight variations of temperature were positively correlated (P = 0.05) with subtidal biomass.
    • Article

      Sargassum Studies in Currimao, Ilocos Norte, Northern Philippines II. Seasonal Variations in Alginate Yield and Viscosity of Sargassum carpophyllum J. Agardh, Sargassum ilicifolium (Turner) C. Agardh and Sargassum siliquosum J. Agardh (Phaeophyta, Sargassaceae) 

      AR Ragaza & AQ Hurtado - Botanica Marina, 1999 - Walter de Gruyter
      The yield (%) and viscosity (cps) of alginate from Sargassum carpophyllum, S. ilicifolium and S. siliquosum collected along the inter- and subtidal zones of Currimao, Ilocos Norte were determined monthly for a period of one year. Results show that each species demonstrated an individual pattern of alginate characteristics which is significantly influenced by the collecting zone, fertility state, and collecting month (P < 0.05). Positive correlations were observed in alginate yield and viscosity with species and fertility states. Among the three species, S. ilicifolium is the best species for alginate production for the food industry based on viscosity characteristics, followed by S. siliquosum and S. carpophyllum.
    • magazineArticle

      The sargeant fish and the eel 

      AP Surtida - SEAFDEC Asian Aquaculture, 2000 - Aquaculture Department, Southeast Asian Fisheries Development Center
      The culture of sargeant fish, or cobia (Rachycentron canadum) and eel (Anguilla spp) in the Philippines is discussed. Market potentials for the cultured products are examined.
    • magazineArticle

      Science and environment education: Aquaculture in focus 

      TU Bagarinao - Fish for the People, 2007 - Secretariat, Southeast Asian Fisheries Development Center
    • magazineArticle

      Science and future of aquaculture 

      Southeast Asian Fisheries Development Center, Aquaculture Department - Aqua Farm News, 1992 - Aquaculture Department, Southeast Asian Fisheries Development Center
    • Conference paper

      Screening of inexpensive and indigeneous ingredients for use in practical feed for juvile sea bass (Lates calcarifer Bloch) 

      RM Coloso, JR Hipolito & D Murillo - 1996 - Aquaculture Department, Southeast Asian Fisheries Development Center
      An eight-week feeding experiment with juvenile sea bass (about 15 g) was conducted in 500-1 fiberglass tanks to screen the most cost-effective practical diet for use in ponds and floating cages. Eleven formulations and one control feed were tested. Protein sources used were locally available ingredients such as fish meal, shrimp head meal, scrap squid meal, cow's blood meal, poultry feather meal, leaf meals, soybean meal, and mung bean meal. The diets contained a combination of animal and vegetable protein sources such that the essential amino acid composition was close to the requirement or tissue levels. Crude protein and fat levels were about 42% and 8.3%, respectively. Fish were fed ad libitum twice a day at 0800 and 1600 h. Best weight gain (189%) and feed conversion ratio (FCR, 1.7) were observed in fish given a combination of fish meal, shrimp head meal, scrap squid meal, soybean bean meal, and kangkong leaf meal as protein sources. This was followed by those given a combination of fish meal, shrimp head meal, scrap squid meal, soybean meal, and ipil-ipil leaf meal (139% weight gain, FCR of 2.2). Worst growth (22%) and FCR were observed in fish given a combination of fish meal, cow's blood meal, scrap squid meal, soybean meal, and mulberry leaf meal. Control fish given a combination of fish meal, shrimp meal, and soybean meal showed weight gain of 195% and FCR of 1.8. Survival was high (83-100%) in all treatments. The two diets which gave the best growth rates, survival, and FCR in the screening phase can be tried in ponds and floating net cages.
    • Article

      Screening of vibriosis in Asian seabass, Lates calcarifer using loop-mediated isothermal amplification (LAMP) assay 

      CMA Caipang, RV Pakingking Jr. & MJS Apines-Amar - Human & Veterinary Medicine, 2012 - Bioflux Society
      The aim of this study was to standardize a loop-mediated isothermal amplification (LAMP) assay for the detection of Vibrio harveyi , the causative agent of vibriosis in Asian seabass, Lates calcarifer. The dnaJ gene of the bacterial pathogen was used as the target gene for the LAMP assay. It was optimized at an incubation time of 1 h at 63°C. The assay was highly specific for V. harveyi and did not cross-react with other bacterial pathogens offish. However, the assay was able to detect V. harveyi that was isolated from infected shrimps. The limit of detection of the LAMP assay was 40 pg of DNA mL-1 or 40 fg of the genomic DNA per LAMP reaction and was 10 times more sensitive than conventional PCR in detecting the bacterial pathogen from infected samples. The LAMP products can be quantified spectrophotometrically using hydroxynaphthol blue (HNB) dye and showed positive correlation with the amount of the pathogen. These results demonstrated that LAMP is a simple and sensitive detection technique that has potential application for routine diagnosis of vibrosis caused by V. harveyi in Asian seabass and other aquatic species.
    • Conference paper

      Scylla species found in Cochin backwaters, Kerala, South India 

      PL Devi & A Joseph - In ET Quinitio, FDP Estepa, YC Thampi Sam Raj & A Mandal (Eds.), Proceedings of the International Seminar-Workshop on Mud Crab Aquaculture and Fisheries Management, 10-12 April 2013, Tamil Nadu, India, 2015 - Rajiv Gandhi Centre for Aquaculture (MPEDA)
      The present study described the Scylla species collected from Cochin backwaters for two years from June 2010 to May 2012. Identification and description of Scylla species were carried out based on the morphological characters focusing on the first and second male gonopods, and third maxillipeds.

      The first male pleopods of the three species were found to be similar in shape, but variations were observed in the setation pattern. S. serrata and S. tranquebarica showed two patches of setae on the inner margin on its posterior end, which was thin and inconspicuous in the former, while thick and conspicuous in the latter. S. olivacea was found to possess only a single tuft of thick setae on the inner margin of the first male pleopod. The second male pleopods were similar in S. serrata and S. tranquebarica, while found to be varied in S. olivacea. The second male pleopods were found to possess setation on the inner margin on its posterior region in S. olivacea, which was totally absent in S. serrata and S. tranquebarica. There were no significant variations in the third maxillipeds among the three Scylla spp. The third maxillipeds of three Scylla spp. were characterized by broad and flattened merus and ischium, lined with thick hairs on the inner margin.

      The present study shows the occurrence of three species, Scylla serrata, S. tranquebarica and S. olivacea, in Cochin backwaters. However identification of species needs to be confirmed using molecular techniques.