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  • 1
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    A Review on the Status of Small Pelagic Fish Resources in the Lingayen Gulf for the Year 2009-2013 (2021)
    In:  http://aquaticcommons.org/id/eprint/26765 | 25026 | 2019-09-12 03:07:14 | 26765 | National Fisheries Research and Development Institute, Philippines
    Details
    Publication Date: 2021-07-24
    Description: This study was carried out to increase information on the status of small pelagic fish species status in Lingayen Gulf. The information includes the catch per unit of effort of fishing gears catching small pelagic and the current status of the dominant small pelagic fish species using the National Stock Assessment Program (NSAP) standard data gathering of fisheries catch and effort. The results showed that almost 50% of the total fish harvest in Lingayen Gulf are small pelagics and the commercial fisheries sector contributed the largest catch. The commercial fishing gears that mostly catch small pelagics are the Danish seine and Trawl with an annual catch per unit of effort ranging from 899 to 1,186 kg/day and 65.98 to 119.77 kg/day, respectively. The municipal fishing gears, bottom set gillnet and bottom set longline had an annual catch per unit of effort ranging from 7.04-42.95 and 7.19-13.30 kg/day, respectively. The dominant small pelagic species are Decapterus maruadsi, Decapterus macrosoma, Selar crumenophthalmus, Rastrelliger brachysoma, and Rastrelliger kanagurta. The dominant species caught by commercial fishing gears are mostly juveniles while the dominant species caught by municipal fishing gears attained maturity before they are caught. Exploitation ratio (E-values) of the dominant small pelagic species in this study exceed the optimum level of 0.5, an indication of overexploitation due to high fishing pressure.
    Keywords: Aquaculture ; Ecology ; Fisheries ; Small pelagic ; Resources in Lingayen Gulf
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-13
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  • 2
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    Effect of substrate types on fecundity and nauplii production of ablated Penaeus monodon Fabricius (2021)
    In:  aqdchief@seafdec.org.ph | http://aquaticcommons.org/id/eprint/18757 | 17342 | 2015-11-15 15:48:54 | 18757 | Southeast Asian Fisheries Development Center, Aquaculture Department
    Details
    Publication Date: 2021-07-11
    Description: Experiments were undertaken to assess the survival, spawning, fecundity and nauplii production of ablated P. monodon females reared in flow-through broodstock tanks with white coralline and black sand substrate for 62 days. The similar trend observed in mortality rates in both substrates suggests that variation in substrate material for broodstock tanks is not a likely cause of prawn mortality. There were also no significant differences observed between rematurtion rates, i.e. number of spawnings, under the different treatments. Singnificantly higher nauplii production were observed in females in tanks with white substrates. At present, the land-based broodstock tanks in SEAFDEC utilize white coralline substrates due to higher hatching rate of eggs and nauplii production, convenience in siphoning out debris and excess food that tend to accumulte in the tank, and contrast provided by the white substrate during nightly observations of ovaries.
    Keywords: Aquaculture ; Biology ; Crustacean culture ; Fecundity ; Spawning ; Substrata ; Penaeus monodon
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 20-22
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  • 3
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    Effect of different sex ratios of ablated wild-stock Penaeus monodon Fabricius on maturation, fecundity and hatching rates (2021)
    In:  aqdchief@seafdec.org.ph | http://aquaticcommons.org/id/eprint/18803 | 2002 | 2015-11-20 14:43:08 | 18803 | Southeast Asian Fisheries Development Center, Aquaculture Department
    Details
    Publication Date: 2021-07-11
    Description: The study was conducted to determine other sex ratios of ablated wild-stock Penaeus monodon other than the most commonly practiced 1 male: 1 female. Four different sex ratios, 0:1, 1:1, 1:2, and 1:4 male: female were tested in four 4m diameter circular tanks for a period of 55 days. During the first run the 1 male: 2 females ratio gave: (a) the highest percentage of first (42.20%), second (30.00%) and third (33.33%) spawning; and (b) the highest total and average fecundity (3.9 million eggs and 300,692 eggs, respectively). The 1 male: 2 females ratio is recommended on the basis of highest percentage for the first, second and third spawners, total and average fecundity.
    Keywords: Aquaculture ; Fisheries ; Penaeus monodon ; marine environment ; Brood stocks ; Eyestalk extirpation ; Fecundity ; Hatching ; Organ removal ; Sex ratio ; Sexual maturity ; Shrimp culture ; Spawning
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 15-18
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