* ICLARM is now known as WorldFish Center

Naga - The *ICLARM Quarterly
Vol. 22, No. 1 (January - March 1999)

Fishbyte (Fisheries Section of NTAFP)
Spreadsheets are being increasingly used by fisheries scientists and one of the masters of the game is Tony Pitcher from the Fisheries Centre, UBC. The use of spreadsheets has been promoted by the FAO/Danida Training Courses in Fish Stock Assessment, and they are indeed excellent for creating an understanding of the underlying calculations.  Because of the ease of building applications in spreadsheet they are also a very convenient tool for the experienced user. Needless to say there is a danger associated with them with regard to quality control. Errors can be easily introduced and it is difficult to verify results from such analyses. As creation of software is becoming a more and more complex task, we need to consider when it is best to use spreadsheets and when distributed software. We hope that Prof. Pitcher’s contribution will help to stimulate this discussion.

Mr. G. Silvestre and Dr. V. Christensen

Length-Weight Relationships of Demersal Fishes from the Gulf of  Salamanca, Colombia
L.O. Duarte, C.B. García, N. Sandoval,  D. von Schiller, G. Melo and P. Navajas

The parameters a and b of the length-weight relationship of the form W=aLb are presented for 37 fish species, belonging to 17 families, caught during a demersal trawl survey over the period December 1995 to March 1998 in the Gulf of Salamanca, Colombia.

L.O. Duarte, C.B. García, N. Sandoval, D. von Schiller, G. Melo and P. Navajas are from the Instituto de Investigaciones Marinas y Costeras INVEMAR, A.1016, Santa Marta, Colombia S.

Beverton and Holt Equations: Spreadsheet Functions and Uncertainty
T.J. Pitcher

This contribution illustrates how modern spreadsheets aid the calculation and visualization of yield models and how the effects of uncertainties may be incorporated using Monte Carlo simulation. It is argued that analogous approaches can be implemented for other assessment models of simple to medium complexity—justifying wider use of spreadsheets in fisheries analysis and training.

T.J. Pitcher is Director of the Fisheries Centre, University of British Columbia, Vancouver, Canada.


Length-Weight Relationship of Fishes from  Yemen Waters (Gulf of Aden and Red Sea)
H. al Sakaff and M. Esseen

no abstract

Occurrence and Distribution of Fish Species off Yemen (Gulf of Aden and Arabian Sea)
H. al Sakaff and M. Esseen

no abstract

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