Population parameters and exploitation of commercial scallop fishery for Chlamys nobilis in Asid Gulf, Philippines

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Population parameters and exploitation of commercial scallop fishery for Chlamys nobilis in Asid Gulf, Philippines

Christian D. Cabiles, Ian Cris R. Buban, Victor S. Soliman, Renan U. Bobiles, Alex P. Camaya
Int. J. Biosci.15( 2), 118-131, August 2019.
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Many scallop stocks have collapsed few years after their onset of harvesting as a result of unregulated fishing practices. Thus basically, studies on population parameters of exploited species are necessary to understand their states and dynamics that would provide foundation in formulating management scheme for the conservation and protection of the resource. For this study in Asid Gulf (Philippines), 300 specimens of Chlamys nobilis were randomly collected monthly from the catches of hookah divers. Shell height was measured and their length-frequencies were analysed using an objectives length-based computer program. Results of the study demonstrated that the estimated asymptotic length (L) and growth coefficient (K) were 9.82 cm and 0.76 year-1, respectively. All the computed values of fishing mortality (F1=1.50, F2=1.26, F3=1.71) reveal high fishing pressure beyond the optimum resulting to a heavily exploited stock. Recruitment pattern was continuous displaying a single major annual peak event (May) corresponding to the reported major spawning of the species (December to February). The length-at-first-capture (6.28 cm) that is beyond the size-at-first-maturity (5.70-5.89 cm) and the high Fi among the largest scallops (6.0-8.5 cm) support the occurrence of recruitment overfishing. The current exploitation rate (E=0.76), found equal to its maximum exploitation rate (Emax=0.76), suggests the need to regulate harvesting. Appropriate management scheme is urgently needed to sustain the resource. Specifically, a substantial reduction in the current exploitation should be made along the aim of obtaining optimum yields. In addition, exploring the aquaculture potential of this species is recommended.


Adam P. 1980. Life history pattern in marine fishes and their consequences for fisheries management. Fishery Bulletin-National Oceanic and Atmospheric Administration 78, 1- 12.

Belda CA, Del Norte AGC. 1988. Notes on the induces spawning and larval rearing of the Asian moon scallop Amusium pleuronectes (Linne) in the laboratory. Aquaculture 72, 173-179. https://doi.org/10.1016/0044-8486(88)90157-3

Beverton RJH, Holt SJ. 1966. Manual of methods for fish stock assessment, Part II. FAO Fisheries Technical Paper No. 38 (Rev. 1), Rome: FAO, p 67.

Bobiles RU, Soliman VS. 2018. Fishery of commercial scallops in Asid Gulf, Philippines. Aquaculture Aquarium Conservation and Legislation Bioflux 11(4), 1265-1273.

Bourne NF. 2000. The potential for scallop culture – the next millennium. Aquaculture International 8, 113-122.

Brand AR. 1991. Scallop ecology: distribution and behavior. In: Scallops: Biology, Ecology and Aquaculture (ed. S.E. Shumway), p 517-84. Elsevier Science Publisher B.V., Amsterdam.

Brand AR. 2006. Scallop ecology: distributions and behavior. In: Shumway, S. E. & G. J. Parsons, editors. Scallops: biology, ecology and aquaculture. Amsterdam, The Netherlands: Elsevier, p 651–744.

Bull MF. 1994. Enhancement and management of New Zealand’s “southern scallop” fishery. In: Bourne, N.F., Bunting, B.L., Townsend, L.D. (eds.). proceedings of the 9th International Pectinid Workshop, Nanaimo, B.C., Canada, April 22-27, 1993. Volume 2. Canadian Technical Report of Fisheries and Aquatic Sciences 1994, p 131-136.

Burnell GM. 1995. Age-related protandry in the scallop Chlamys varia (L.) on the west coast of Ireland. International Council for the Exploration of the Sea (ICES) Marine Science Symposia 199, 26-30.

Biswas SP. 1993. Manual of Methods in Fish Biology. South Asia Publishers. Pvt. Ltd, New Delhi, p 195.

Cabiles CD, Soliman VS. 2019. Reproduction temperature-nexus influencing spawning of pectinids in tropical and temperate waters. Aquaculture Aquarium Conservation and Legislation Bioflux 12(1), 63-72. http://www.bioflux.com.ro/docs/2019.63-72.pdf

Cadrin SX, Collas MD. 2015. Stock assessment methods for sustainable fisheries. International Council for the Exploration of the Sea Journal of Marine Science 72(1), 1-6. https://doi.org/10.1093/icesjms/fsu228

Conan G, Shafee MS. 1978. Growth and biannual recruitment of the black scallop Chlamys varia (L.) in Lanveoc area, Bay of Brest. Journal of Experimental Marine Biology and Ecology 35(1), 59-71. https://doi.org/10.1016/0022-0981(78)90090-4

del Norte AGC. 1988. Aspect of the growth, recruitment, mortality and reproduction of the bay scallop Amusium pleuronectes (Linne) in Lingayen Gulf, Philippines. Ophelia 29(2), 1533-168. http://dx.doi.org/10.1080/00785326.1988.10430826

del Norte-Campus A, Villarta KA. 2010. Use of population parameters in examining changes in the status of the Short-Necked Clam Paphia undulata Born, 1778 (Mollusca, Pelecypoda: Veneridae) in coastal waters of Southern Negros occidental. Science Diliman 22, 53-60.

Gayanilo FC, Sparre P, Pauly D. 1996. FAO-ICLARM Stock Assessment Tools (FiSAT) user’s manual. FAO Computerized Information Series (Fisheries) 8, p 266.

Gayanilo FC, Pauly D. 1997. The FAO-ICLARM stock Assessment Tools (FiSAT) Reference Manual FAO Computerized information Series (Fisheries). No.8, FAO, Rome, p 262.

Gayanilo FC, Sparre P, Pauly D. 2005. FAO-ICLARM stock assessment tools II (FiSAT-II). Revised version. Users guide. FAO Computerized Information Series (Fisheries) 8, revised version. FAO, Rome.

Gosling EM. 2003. Bivalve molluscs; Biology, Ecology and Culture. Oxford, OX2OEL, Fishing News Books, p 443.

Gould E, Fowler BA. 1991. Scallops and pollution. In: Shumway, S.E. (ed). Scallops: biology, ecology and aquaculture. Elsevier, Amsterdam, p 495-515.

Gulland JA. 1971. Fish resources of the ocean. FAO Fisheries Technical Paper (97). West Byfleet, Survey, Fishing News Books Ltd., p 425.

Hardy D. 2006. Scallop Farming 2nd Edition. Oxford: Blackwell Publishing, p 59-65.

Laureta LV. 2008. Compendium of the economically important seashells in Panay, Philippines. Quezon City, Philippines. The University of the Philippines Press, 162 p.

Llana MEG. 1979. Notes on the occurrence of pea crab (Pinnotheres sp.) in the Asian moon scallop (Amusium pleuronectes Linne.). Fisheries Research Journal of the Philippines 4(2), 41-43.

Llana MEG. 1983. Size composition, occurrence, distribution and abundance of scallops in the Visayan Sea. Philippine Journal of Fisheries 16(2), 75.94.

Llana MEG. 1988. Growth, mortality, and recruitment in the Asian moon scallop, Amusium pleuronectes in the Visayan Sea, Philippines. In Contr. Trop. Fish. Biol.: Papers by the participants at the FAO/DANIDA Follow-up Training Courses on Fish Stock Assessment in the Tropics, edited by Venema S. C., Christensen J. M., Pauly D., pp 16-24. Manila Philippines, 12 January-6 February 1987. FAO Fisheries Report 389, 519, p Rome 1988.

Llana MEG, Aprieto VL. 1983. Reproductive biology of the Asian moon scallop Amusium pleuronectes. Fisheries Research Journal of the Philippines 5(2), 1-10.

Lu YT, Blake NJ. 1997. Clearance and ingestion rates of Isochrysis galbana by larval and juvenile bay scallops, Argopecten irradians concentricus (Say). Journal of Shellfish Research 16, 47-54.

Mendoza AB, Soliman VS. 2017. Coastal habitats of Asid Gulf, Masbate, Philippines: assessment and role of marine protected areas for management development. Aquaculture Aquarium Conservation and Legislation Bioflux 10(5), 1351-1359.

Mendo J, Jurado E. 1993. Length-based growth parameter estimates of the Peruvian scallop (Argopecten purpuratus). Fisheries Research 15, 357-367. https://doi.org/10.1016/0165-7836(93)90086-M

Minchin D. 2003. Introductions: some biological and ecological characteristics of scallops. Aquatic Living Resources 16, 521-532. https://doi.org/10.1016/j.aquliv.2003.07.004

Morillo-Manalo L, Quinitio GF, Laureta LV, Anasco NC, Monteclaro HM. 2016. Ecology and reproductive biology of the senatorial scallop Chlamys senatoria (Gmelin 1791) in Gigantes Islands, Carles, Central, Philippines. Journal of Shellfish Research 35(1), 17-25. https://doi.org/10.2983/035.035.0103

Nurul-Amin SM, Zafar M, Barua M. 2009. Population dynamics of Venus Clam Meretrix meretrix from the Moheshkali Island in the Cox’s Baxar Coast of Bangladesh. Asian Fisheries Science 22, 1031-1043.

Orensanz JM, Parma AM, Iribarne OO. 1991. Population dynamics and management of natural stocks. In: Shumway, S.E. (ed). Scallops: biology, ecology and aquaculture. Elsevier, Amsterdam, p 625-713.

Pauly D, Gaschuetz, G. 1979. A simple method for fitting oscillating length growth data, with a program for pocket calculators. ICES CM 1979/G:24. Demersal Fish. Cttee., 26 p (mimeo).

Pauly D. 1980. On the interrelationships between natural mortality, growth parameters, and mean environmental temperature in 175 fish stocks. Journal of de Conseil, Conseil International Pour L’Explorat de la Mer 39, 175-192.

Pauly D. 1983. Some simple methods for the assessment of tropical fish stocks. FAO Fisheries Technical Paper 234, 1-52.

Pauly D. 1984. Length-converted catch curve: A powerful tools for fisheries research in the tropics (part II). ICLARM Fishbyte 2, 17-19.

Pauly D, Munro J. 1984. Once more on growth comparisons in fish and invertebrates. Fishbyte 2(1), p 21.

Peña JB. 2001. Taxonomía, morfología, distribución y hábitat de los pectínidos Iberoamericanos. In: A.N. Maeda-Martínez (ed.). Los moluscos pectínidos de Iberoamérica: ciencia y acuicultura, Editorial Limusa, México, p 1-25.

Poutiers JM. 1998. Bivalves (Acephala, Lamellibranchia, Pelecypoda). In: Carpenter, K. E. & V. H. Niem, editors. FAO species identification guide for fishery purposes. The living marine resources of the Western Central Pacific 1, Seaweeds, corals, bivalves and gastropods. Rome, Italy: FAO., p 123–362.

Soliman VS, Dioneda RR. 2004. Quick stock assessment of commercial scallops (Bivalvia: Pectinidae) in Asid Gulf, Masbate. University of the Philippines in the Visayas Journal of Natural Science 9(1), 165-176.

Sparre P, Ursin E, Venema SC. 1992. Introduction of tropical fish stock assessment, Part 1 Manual, FAO Fisheries Technical Paper 306(1), Italy, Rome. FAO, p 337.

Stotz W, Mendo J. 2001. Pesquerías, repoblamiento y manejo de bancos naturales de pectínidos en Iberoamerica: su interacción con la acuicultura. In: A.N. Maeda- Martínez (ed.). Los moluscos pectínidos de Iberoamérica: ciencia y acuicultura, Editorial Limusa, México, p 357-374.

Strand O, Volstad JH. 1997. The molluscan fisheries culture of Norway. NOAA Technical Report NMFS 129. US Department of Commerce, p 7-24.

Telahigue K, Hajji T, Cafsi M, Saavedra C. 2018. Genetic structure and demographic history of the endemic Mediterranean scallop Pecten jacobaeus inferred from mitochondrial 16s DNA sequence analysis. Animal and Biodiversity Conservation 41(1), 61-73.

Waller TR. 1991. Evolutionary relationships among commercial scallops (Mollusca: Bivalvia: Pectinidae). In: Shumway, S.E. (ed). Scallops: biology, ecology and aquaculture. Elsevier, Amsterdam, p 1-73.