Powell, C.B. and Hart, A.I. and Deekae, S.
Market survey of the periwinkle Tympanotonus fuscatus in Rivers State: Sizes, prices, trade routes and exploitation levels.
In: 4th Annual Conference of the Fisheries Society of Nigeria (FISON)
, 26-29 November, 1985
, Port-Harcourt, Nigeria.
Tympanotonus fuscatus was collected from 23 markets through Rivers State (Nigeria), a few in neighbouring states, and from an unexploited population at Buguma. The size distribution of shells was determined,and information on prices and trade routes was also obtained. The mean shell length of specimens from the unexploited Buguma population was 46.4 mm, compared to 30.4 mm for the Buguma market samples. Mean sizes in other markets showed a geographic pattern: the smallest were from the Adoni-Ogoni-Opobo sector (28.1-30.9); the largest were from the Nembe-Brass sector (37.7-44.2) and Bendel State (35.7-45.6); The results suggest the population structure of Tympanotonus in much of Rivers State has been strongly impacted by overharvesting. They show that local market as well as some in Cross River State, are increasingly being supplied by road with specimens from the Benin River area of Bendel State. Differences between shell types; and relations between shell size, selling price and market distance from source, are also discussed
Conference or Workshop Item
||Market survey of the periwinkle Tympanotonus fuscatus in Rivers State: Sizes, prices, trade routes and exploitation levels
||4th Annual Conference of the Fisheries Society of Nigeria (FISON)
||26-29 November, 1985
||Fisheries Society of Nigeria
||Nigeria, River State ; fishery industry; gastropod fisheries; market research; overfishing; shells; size distribution; Tympanotonus fuscatus
Ms Maria Kalentsists
||13 May 2010 20:04
||29 Sep 2011 17:31
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