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  • 1
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    Population Parameters of Common Small Pelagic Fishes Caught by Ringnet in Manila Bay, Philippines (2021)
    In:  http://aquaticcommons.org/id/eprint/26971 | 25026 | 2020-03-04 06:30:30 | 26971 | National Fisheries Research and Development Institute, Philippines
    Details
    Publication Date: 2021-07-24
    Description: The growth and mortality parameters, exploitation ratios, and annual recruitment patterns of sardines (Sardinella gibbosaand Sardinella fimbriata) and mackerel (Rastrelliger brachysoma) caught by ring net in Manila Bay were estimated based on raised length-frequency data collected for one year (January to December 2014). Data were regularly collected in selected fish landing sites where ring netters regularly unload their catch. Results of the length frequency analysis are summarized. The growth parameters for the three species are as follows, Sardinella gibbosa (L∞ = 18.49 cm, K = 0.88 yr-1); Sardinella fimbriata (L∞ = 18.5 cm, K = 0.95 yr-1); and Rastrelliger brachysoma (L∞ = 28. 67 cm, k = 1.3 yr-1). The results showed only a slight difference from previous studies conducted in Manila Bay. For the mortality parameters, L50 and E-values, results showed increased values compared to previous studies. The E-values of the three species already exceeded the optimum exploitation value of E=0.5, indicating that overfishing is occurring.
    Keywords: Biology ; Ecology ; Fisheries ; Growth parameters ; mortality parameters ; exploitation rate ; recruitment pattern
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 17-30
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  • 2
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    Species Composition, Distribution, Biomass Trends and Exploitation of Dominant Fish Species in Manila Bay using Experimental Trawl Survey (2021)
    In:  http://aquaticcommons.org/id/eprint/26972 | 25026 | 2020-03-04 06:14:38 | 26972 | National Fisheries Research and Development Institute, Philippines
    Details
    Publication Date: 2021-07-24
    Description: An experimental trawl fishing survey was conducted in Manila Bay from March 2014 to October 2015 at sixteen (16) pre-established dragging stations adapted from an earlier study (MADECOR, 1995). Using a commercial otter trawl, the average trawling speed during fishing operations was 6-7 km/hour. Analysis of catches focused on biomass trends, species composition, distribution and exploitation of dominant species. A total of 146 fish and invertebrate species belonging to 48 families were recorded during the survey period wherein most of the catches were dominated by small pelagic species such as anchovies and sardines. Exploitation rates (E) for the six (6) dominant species (Sardinella gibbosa, Sardinella fimbriata, Valamugil seheli, Mugil cephalus, Encrasicholina devisi and Stolephorous commersonnii) shows signs of overfishing. The estimated demersal fish biomass of the bay revealed that the relative decline was about 90% from the 1947 baseline study.
    Keywords: Biology ; Conservation ; Ecology ; Fisheries ; Management ; Policies ; Manila Bay ; overfishing ; demersal fish biomass ; trawl
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 31-46
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  • 3
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    Reproductive Biology of Common Small Pelagic Fishes in Manila Bay, Philippines (2021)
    In:  http://aquaticcommons.org/id/eprint/26973 | 25026 | 2020-03-04 06:52:45 | 26973 | National Fisheries Research and Development Institute, Philippines
    Details
    Publication Date: 2021-07-24
    Description: Reproductive biology of the three dominant species (Sardinella gibbosa, Sardinella fimbriata, and Rastrelliger kanagurta) were studied in Manila Bay from January 2014 to December 2015. The data were collected from landed catch (coming from gillnet, lift net, purse seine, ringnet, and trawl) and during the actual trawl fishing survey. A total of 2,383 Sardinella gibbosa, 2,334 Sardinella fimbriata, and 549 Rastrelliger kanagurta were analyzed by pooling the two years data. The overall female to male ratio conformed to the expected 1:1 sex ratio. These species spawn throughout the year with major peak in March and April and minor peak in October to December for Sardinella gibbosa; with major peak in February to May and minor peak in October to December for Sardinella fimbriata; and for Rastrelliger kanagurta, with major peak in October to December and minor peak in May and June. The GSI values correlate with the maturation of the gonads of these species. The length at maturity (Lm50) was calculated at 12.75 cm in males and 13.25 cm in females for S. gibbosa; 12.25 cm in males and 12.75 cm in females for S. fimbriata; and 25.5 cm in males and 24.5 cm in females for R. kanagurta.
    Keywords: Biology ; Fisheries ; Gonadosomatic index ; sex ratio ; length at first maturity ; spawning season ; reproductive biology ; Manila Bay
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 47-60
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  • 4
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    Preliminary Inventory of Boats and Gears in Manila Bay (2021)
    In:  http://aquaticcommons.org/id/eprint/26974 | 25026 | 2020-03-05 00:51:39 | 26974 | National Fisheries Research and Development Institute, Philippines
    Details
    Publication Date: 2021-07-24
    Description: Recent information about the number and types of boats and gears used in Manila Bay is lacking. Here we discuss the results of the initial boat and gear inventory conducted in Manila Bay from May 2015 to October 2016. The survey was done in the coastal barangays of Cavite, Bataan, Bulacan, Pampanga, and Metro Manila. A total of 3,659 fishing boats were recorded from 84 coastal barangays or about 40% out of the 212 coastal barangays in Manila Bay. About 94.45% of the boats are municipal fishing boats and only 5.55% are commercial boats and the highest number of boats recorded was in Cavite (1,461 boats). 91.04% of the fishing boats are motorized and only 8.96% are non-motorized. The average fisher to boat ratio for the five provinces is 3.0:1, which is higher compared to the 2.4:1 result of MADECOR and National Museum Assessment (1995). There are 25 types of fishing gears recorded during the survey with a total of4, 946 units. Gillnet, specifically bottom gillnet, is the most dominant gear being used in Manila Bay.
    Keywords: Engineering ; Fisheries ; Manila Bay ; fishing vessels ; fishing gears
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 61-81
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