The Razor clam Solen dactylus is being harvested for the last 10 years from mudflats in creeks of district Thatta. The results of water and soil quality samples indicate the suitability and support for growth, dispersal, production and reproduction of Solen dactylus occurring in Indus delta eco-region. Water quality parameters of creeks indicated the ranges of temperature of water and air 11 to 30 ℃ and 12 to 42℃, pH of water between 8.2 to 8.9, alkalinity of water 267 to 480 mg/l, hardness of water 620 to 1150 mg/l, salinity of water from 22 to 33 ppt. The soil samples of mudflats indicated silt clay 15 to 30%, sandy clay 20 to 40% and fine sand 30 to 40%. Spring, summer and early winter seasons are suitable timing for harvesting razor clam. However, winter cold and rainy seasons are not suitable for razor clam fishing. In winter, the animals become inactive and remain in deep barrows and do not come to the surface. In period of rainfall the razor clam holes were filled with fine silt thus large number of razor clam were affected and even deaths may have been caused if mudflats were exposed at the time of rain.
The recorded mature size of razor clam ranged between length of 6 to 3.5 cm and weight 12 to 40 grams. A trained person dig-out 1.5 to 3 kg of razor clam in 12meter square in 20-40 minutes. Thus a person can exploit 10-20 kg of razor clam in a period of 3- 4 hours, hence 15 - 20 kg of live razor clam can be harvested in a day or night by a person when mudflat become exposed after tidal action. Coastal communities inhabiting creek areas are engaged in its harvesting using traditional techniques of using salt and probing with thin sticks and hauling razor clams from burrow during low tides when mudflats become exposed. It is concluded that Razor clam is an ecologically important group of marine organism, lives in mudflats and creek systems. Although the razor clams are not locally consumed by native people of Pakistan but it is a fishery having export value which foreign exchange earned by exporting it to South East Asian countries.
Ahmed, J., 1986. Studies on the size-weight relationship and population density of razor clam (Solen truncates) found on sandflats of Bandal Island, Korangi creek, Karachi. Presented at International Conference on Marine Science of Arabian Sea (29 March - 2 April, 1986) Karachi, p.14 (Abstract).
Alagarswami, K., 1966. Studies on some aspects of biology of the wedge-clam; Donax faba (Gmein, 1791) from Mandapam coast in the Gulf of Mannar. J. Mar. Biol. Ass. India. 8(1): 56-75.
Armonies, W. and K. Reise, 1999. On the population development of the introduced razor clam Ensis americanus near the island of Sylt (North Sea). Helgol. Meeresunters. 52: 291-300.
Beverwijk, A., 1967. Particle size analysis of soils by means of the hydrometer method. Sediment. Geol. 1: 403-406.
Bouyoucos, G.J., 1962. Hydrometer method improved for making particle size analysis of soils. Agronom. J. 54: 464-465.
Cahn, A.R., 1951. Clam Culture in Japan. Washington D.C., U.S. Fish and Wildlife Service, Fish. Leaflet. 399: 1-103.
Cosel, R.V., 1989. Three new species of Solen (Bivalvia: Solenidae) from the Indian Ocean, with remarks on the Solenidae of Madagascar. J. Conchol. 33: 189-208.
Hmida L., C. Fassatoui, D. Ayed, N. Ayache and M.S. Romdhane, 2012. Genetic characterization of the razor clam Solen marginatus (Mollusca: Bivalvia: Solenidae) in Tunisian coasts based on isozyme markers. J. Biochem. Syst. Ecol. 40: 146-155.
Moazzam, M. and J. Ahmed, 1986. Prospects of development of molluscan fisheries in Pakistan. Proceedings of National seminar on fisheries policy and planning, Marine Fisheries Department, Karachi.
Mahadevan, S. 1980. Taxonomy and ecology of cultivable molluscs. In: Summer institute in culture of edible molluscs held at Tuticorin Research Centre of Central Marine Fisheries Research Institute, India from 26 may to 24 june 1980. p. 41-54.
Mahar, M.A., 2018. Razor clam fishery and Socio-economic conditions of fishermen. Pub.: Centre for Coastal and Deltaic Studies, University of Sindh Campus Thatta. p. 1-39.
Rinyod, A.M.R. and S.A.K.A. Rahim, 2011. Reproductive cycle of the razor clam Solen regularis Dunker, 1862 in the western part of Sarawak, Malaysia, based on gonadal condition index. J. Sustainabil. Sci. Manage. 6(1): 10-18.
Saeedi, H., S.P. Raad, A.A. Ardalan, E. Kamrani and B.H. Kiabi, 2009. Growth and reproduction of Solen dactylus (Bivalvia: Solenidae) on northern coast of the Persian Gulf (Iran). J. Mar. Biol. Assoc. U.K. 89(8): 1635-1642.
Saeedi, H., M.J. Costello and R.V. Cosel, 2013. First report of anterior pallial tentacles in Solen dactylus (Bivalvia: Solenidae) from the Northern Persian Gulf, Iran. PloS One. 8(5): e63487. (https://doi.org/10.1371/ journal.pone.0063487).
Tirmizi, N.M. and I. Zehra, 1982. Illustrated key to families of Pakistan Marine Molluscs. Published by Pakistan Science Foundation Islamabad.
Virabhadra, K., K.A. Rao, Narasimham and K. Alagarswami, 1961. A preliminary account of the biology and fishery of the Razor-Shell, Solen kempi Preston, from Ratnagiri in Maharashtra State. Indian J. Fisher. 542-579.
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