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Stock assessment of Spondylus varius (Sowerby, 1827) in lianga bay, surigao del sur, Eastern Mindanao, Philippines

Research Paper | January 1, 2021

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Fabio C Ruaza Jr, Anthony S Ilano

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J. Bio. Env. Sci.18( 1), 44-50, January 2021


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The study was conducted to determine the status of the current stocks of the S. varius in Lianga Bay, Surigao del Sur from July 2016 to August 2019. Some variables in population dynamics, such as asymptotic length (L∞), growth coefficient (K), mortality rate (Z, F and M) and the exploitation rate of S. varius were estimated from length frequencies analyses by means of FAO-ICLARM Stock Assessment Tools (FISAT). Results showed that the growth performance index (φ) was 3.79, asymptotic length (L∞) was 202.65mm and growth coefficient (K) was predicted to be 0.15yr-1. Total mortality (Z) for S. varius was 1.04yr-1 with fishing mortality (F) and natural mortality (M) of 0.74yr-1 and 1.90yr-1, respectively. The increased of fishing mortality over natural mortality, decreased of size of the catch, inflated current exploitation rates (E) of 0.7 which was higher than the optimum level of exploitation (E= 0.50). The Emax, and E10 were 1.29, and 1.55 respectively which interpreted as overexploited. It is therefore to recommend for immediate action in ecological, economical and legal aspects in the fishery of S. varius in Lianga Bay Surigao del Sur, Philippines.


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Stock assessment of Spondylus varius (Sowerby, 1827) in lianga bay, surigao del sur, Eastern Mindanao, Philippines

Bhattacharya C. 1967. A simple method of resolution of a distribution into Gaussian components. Biometrics 23, 115-135.

Cob ZC, Arshad A, Bujang JS, Ghaffar MA. 2009. Age, growth, mortality, and population structure of Strombus canarium (Gastropoda: Strombidae) variations in male and female sub- populations. Journal of Applied Sciences 9 (18), 3287- 3297.

Cooper A. (undated). A Guide to Fisheries Stock Assessment From Data to Recommendations, University of New Hamsphire1- 54.

Cota-Hernández GG, Melo-Barrera FN, Villalejo-Fuerte MT. 2011. Age and growth of donkey thorny oyster Spondylus calcifer (Carpenter, 1857) In the central region of gulf of California, 44th Western Society of Malacologists Annual Meeting and 12th National Biennial Meeting of Malacology and Conchology of the Sociedad Mexicana de Malacología 162.

Cudney-Bueno R, Rowell K. 2008. Establishing a baseline for management of the rock scallop Spondylus calcifer (Carpenter 1857): growth and reproduction in the Upper Gulf of California, Mexico. Journal of Shellfish Research 27, 625-632

Defeo O, Arreguın-Sanchez F, Sanchez J. 1992. Growth study of the yellow clam Mesodesma mactroides: a comparative analysis of three length-based methods. Scientia Marina 56, 53-59.

Fiori SM, Cazzaniga NJ. 1999. Mass mortality of the yellow clam, Mesodesma mactroides (Bivalvia: Mactracea) in Monte Hermoso beach, Argentina. Biological Conservation 89, 305-309.

Froese R, Palomares M. 2000. Growth, natural mortality, length-weight relationship, maximum length and length at first maturity of the coelacanth Latimeria chalumnae. Environmental Biology of Fishes 58, 45- 52.

Gayanilo F Jr, Pauly D Eds. 1997. FAO-ICLARM stock assessment tools (FiSAT). Reference manual, FAO Computerized Information Series (Fisheries), No. 8, Rome, FAO 262.

Herrmann M, Alfaya JE, Lepore ML, Penchaszadeh PE, Arnts WE. 2008. Population structure, growth and production of the yellow cal, Mesodesma mactroides (Bivalvia: Mesodesmatidae) from a high-energy, temperate beach in Northern Argentina. Helgoland Marine Research 65, 285- 297.

King M. 1995. Fisheries biology, assessment and management. Fishing News Books, Wiley-Blackwell 84-90.

Lodeiros C, Soria G, Valentich-Scott P, Munguía-Vega A, Cabrera J, Cudney-Bueno R, Sonnenholzner S. 2016. Spondylids of Eastern Pacific Ocean. Journal of Shellfish Research 35(2), 279-293.

Mackensen AK, Brey T, Bock C, Luna S. 2012. Spondylus crassisquama Lamarck, 1819 as a microecosystem and the effects of associated macrofauna on its shell integrity: Isles of biodiversity or sleeping with the enemy?. Marine Biodiversity 42(4), 443-451.

Mackensen AK. 2013. Towards sustainable artisanal fisheries for the common pool resource Spondylus (Bivalvia, Spondylidae) in Ecuador. PhD diss., Bremen University.

Pauly D, Munro J. 1984. Once more on the comparison of growth in fish and invertebrate. ICLARM Fishbyte 2 (1), 21.

Pauly D. 1980. On the interrelationships between natural mortality, growth parameters and mean environmental temperature in 175 fish stocks”, Journal du Conseil / Conseil Permanent International pour l’Exploration de la Mer 39(3),175-192.

Shady R. 2005. Caral-Supe and its natural and social environment at the origins of civilization, Social Investigations 9(14), 89-120.

Skoglund C, Mulliner D. 1996. The genus Spondylus (Bivalvia: Spondylidae) of the Panamic Province. The Festivus 28, 93-107.

Welcomme RL. 1985. River fisheries, FAO Fisheries Technical Paper 262-300.

Wolff M. 1994. Population dynamics, life histories and management of selected invertebrates of the Southeast Pacific upwelling system. Habilitation thesis, Bremen University 1-108.