Lunar and seasonal variations in the catches of Macrobrachium fisheries of the Cross River Estuary, SE Nigeria

Nwosu, F.M. and Holzlohner, S. (2003) Lunar and seasonal variations in the catches of Macrobrachium fisheries of the Cross River Estuary, SE Nigeria. In: 16th Annual Conference of the Fisheries Society of Nigeria (FISON) , 4-9 November 2001 ,Maiduguri, Nigeria, pp. 48-52.

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Abstract

Monthly catches of the Macrobrachium fisheries were recorded at a commercial shrimp landing site on the coasts of Calabar (Nigeria), from April 1997 to August 1998. Catches fluctuated over an annual cycle, with two peaks occurring from May-July and November-December. These peaks represented periods of major activities, reproduction, recruitment or migration. Also, mean catches decreased in the months of February and August, corresponding to the peak of dry season and the so-called 'August break', respectively. Catches from active gears (seine, push net) varied among the moon phases too, with a main peak during full moon, and the minimum catch was recorded during the first moon quarter. However, the catch from passive gear (trap) depicted an inverse relationship, showing a peak during the first moon quarter. Variation in catches at different months and moon phases were significant at P:0.05. Recognize these variations and trends would help in management decisions such as defining closed seasons without adversely affecting the economy of the fishers

Item Type: Conference or Workshop Item
Title: Lunar and seasonal variations in the catches of Macrobrachium fisheries of the Cross River Estuary, SE Nigeria
Personal Creator/Author:
CreatorsEmail
Nwosu, F.M.
Holzlohner, S.
Page Range: pp. 48-52
Date: 2003
Event Title: 16th Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Maiduguri, Nigeria
Event Dates: 4-9 November 2001
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria, Cross River, Cross Estuary; catch composition; catch statistics; catch/effort; environmental effects; fishery management; fishing gear; marine crustaceans; moon phases; recruitment; reproductive cycle; seasonal variations; shrimp fisheries; vertical migrations; Macrobrachium
Subjects: Management
Fisheries
Environment
Item ID: 3594
Depositing User: Ms Maria Kalentsits
Date Deposited: 07 Jul 2010 07:48
Last Modified: 29 Sep 2011 17:07
URI: http://aquaticcommons.org/id/eprint/3594

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