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Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment

Year 2011, Volume: 11 Issue: 1, - , 01.02.2011

Abstract

Studies were conducted on the growth and mortality parameters, recruitment pattern, probability of capture, yield-per recruit, and present rate of exploitation of the African river prawn, Macrobrachium vollenhovenii from Dawhenya impoundment, Ghana. Estimation of the von Bertalanffy growth parameters gave; L∞ = 14.2 cm, K = 1.0 yr -1 , and to = -0.195 yr -1 with the growth performance index, Ф' of 2.303. From the linearised length-converted catch curve, total mortality, Z was 5.36 yr -1 . Natural mortality, M calculated from Pauly's empirical formula was 2.20 yr -1 and fishing mortality, F calculated from Z - M was 3.16 yr -1 . From the mortality estimations, the present rate of exploitation, E calculated from F/Z was 0.59 indicating that, the species is on the verge of being over-exploited in the impoundment. Using the estimated value of the growth coefficient, K, the longevity was found to be about 3 yrs. Estimations from the probability of capture routines gave the length-at-first capture, Lc as 3.07 cm while the size distribution of the catches suggest two recruitment pulses in a year. It is therefore recommended that, the property right-based system for fisheries management should be implemented so that fishermen can cooperate in the management of the Macrobrachium fishery.

Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment

Year 2011, Volume: 11 Issue: 1, - , 01.02.2011

Abstract

Studies were conducted on the growth and mortality parameters, recruitment pattern, probability of capture, yield-per recruit, and present rate of exploitation of the African river prawn, Macrobrachium vollenhovenii from Dawhenya impoundment, Ghana. Estimation of the von Bertalanffy growth parameters gave; L∞ = 14.2 cm, K = 1.0 yr -1 , and to = -0.195 yr -1 with the growth performance index, Ф' of 2.303. From the linearised length-converted catch curve, total mortality, Z was 5.36 yr -1 . Natural mortality, M calculated from Pauly's empirical formula was 2.20 yr -1 and fishing mortality, F calculated from Z - M was 3.16 yr -1 . From the mortality estimations, the present rate of exploitation, E calculated from F/Z was 0.59 indicating that, the species is on the verge of being over-exploited in the impoundment. Using the estimated value of the growth coefficient, K, the longevity was found to be about 3 yrs. Estimations from the probability of capture routines gave the length-at-first capture, Lc as 3.07 cm while the size distribution of the catches suggest two recruitment pulses in a year. It is therefore recommended that, the property right-based system for fisheries management should be implemented so that fishermen can cooperate in the management of the Macrobrachium fishery.

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Details

Primary Language Turkish
Journal Section Articles
Authors

Elliot Haruna Alhassan This is me

Ayaa Kojo Armah This is me

Publication Date February 1, 2011
Published in Issue Year 2011 Volume: 11 Issue: 1

Cite

APA Alhassan, E. H., & Armah, A. K. (2011). Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment. Turkish Journal of Fisheries and Aquatic Sciences, 11(1).
AMA Alhassan EH, Armah AK. Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment. Turkish Journal of Fisheries and Aquatic Sciences. February 2011;11(1).
Chicago Alhassan, Elliot Haruna, and Ayaa Kojo Armah. “Population Dynamics of the African River Prawn, Macrobrachium Vollenhovenii, in Dawhenya Impoundment”. Turkish Journal of Fisheries and Aquatic Sciences 11, no. 1 (February 2011).
EndNote Alhassan EH, Armah AK (February 1, 2011) Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment. Turkish Journal of Fisheries and Aquatic Sciences 11 1
IEEE E. H. Alhassan and A. K. Armah, “Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment”, Turkish Journal of Fisheries and Aquatic Sciences, vol. 11, no. 1, 2011.
ISNAD Alhassan, Elliot Haruna - Armah, Ayaa Kojo. “Population Dynamics of the African River Prawn, Macrobrachium Vollenhovenii, in Dawhenya Impoundment”. Turkish Journal of Fisheries and Aquatic Sciences 11/1 (February 2011).
JAMA Alhassan EH, Armah AK. Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment. Turkish Journal of Fisheries and Aquatic Sciences. 2011;11.
MLA Alhassan, Elliot Haruna and Ayaa Kojo Armah. “Population Dynamics of the African River Prawn, Macrobrachium Vollenhovenii, in Dawhenya Impoundment”. Turkish Journal of Fisheries and Aquatic Sciences, vol. 11, no. 1, 2011.
Vancouver Alhassan EH, Armah AK. Population Dynamics of the African River Prawn, Macrobrachium vollenhovenii, in Dawhenya Impoundment. Turkish Journal of Fisheries and Aquatic Sciences. 2011;11(1).