Ecology and fishery in the Cross River Estuary - a research project

Holzlohner, S. (1999) Ecology and fishery in the Cross River Estuary - a research project. In: 13th Annual Conference of the Fisheries Society of Nigeria (FISON) , 3-8 November 1996 ,New Bussa, Nigeria, pp. 69-75.

PDF (The document's language is English .) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
Download (309kB) | Preview


A literature review of 50 titles including nearly all relevant publications ensures adequate basis on the present level of knowledge. The proposal includes (a) the determination of the biozoenosis and selected environmental factors, and (b) of fishery and stock data of the main fish and shellfish species. The ecological research studies physical and chemical variables of the estuarine waters (flow velocity and direction, water temperature, conductivity, pH, dissolved oxygen, salinity, nutrients such as ammonium, nitrite, phosphate, silicate, pollutants such as hybrocarbons, pesticides and heavy metals, biochemical oxygen demand, chemical oxygen demand), plankton (bacterio-phyto-and zooplankton), benthos, sediment. The fishery biological and fishery investigations include: number of villages and fishermen, number of boats and gears by type, length and weight data of the main fishery objects with concentration on the shrimps, species and numbers of fish parasites. The ecological variables were monitored at fixed stations on sections in the Cross-River Estuary, Calabar and Great Kwara Rivers two times per month during spring and neap tides. The fishery biological and fishery variables were obtained during spring and neap tide too. For the determination of the detailed methodology the ecological and fishery part of the progeamme should be started with frame surveys based on a larger number of stations. These frame surveys should be repeated from time to time. Both parts of the programme are based on three years duration. It seems already appropriate to continue the work with selected representative stations, villages and variables in form of a long-term data chain

Item Type: Conference or Workshop Item
Title: Ecology and fishery in the Cross River Estuary - a research project
Personal Creator/Author:
Holzlohner, S.
Page Range: pp. 69-75
Date: 1999
Event Title: 13th Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: New Bussa, Nigeria
Event Dates: 3-8 November 1996
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria, Cross River, Great Kwara River; ecology; freshwater ecology; research; research proposals
Subjects: Ecology
Item ID: 3726
Depositing User: Ms Maria Kalentsits
Date Deposited: 11 Jul 2010 05:51
Last Modified: 29 Sep 2011 16:55
Related URLs:

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...