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Water chemistry of the Sepik and Ramu River basin

A report prepared for the FISHAID Project, PNG/93/007

Year of publication 1990

Pages 56 p.

Author Coates, D.;Osborne, P. L.;van Zwieten, P. A. M.;Petr, T. O.

Publisher FAO ;

Product type Project

Category Programme / project report

Edition 1

Synopsis (short abstract) A study of water chemistry and related factors in the Sepik-Ramu River basin was carried out with the purpose of providing supportive information for the FAO/UNDP project Sepik River Fish Stock Enhancement (PNG/85/001) and the FISHAID project (PNG/93/007). Field samples were collected in 1988 during the term of PNG/85/001.The present report presents the results of further data analysis and synthesis undertaken during the course of the FISHAID project. For the purpose of their evaluation, the dat a have been grouped by catchments to assess the impact of geological formations on water chemical composition. The results are also briefly discussed for their relevance to biological productivity of the investigated waters.

Language English

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    Preliminary Analysis of Stomach Contents of Various Fish Species from the Lower Order Streams in the Sepik-Ramu Basin and Identification of Vacant and Underutilised Trophic Niches
    Sepik River Fish Stock Enhancement Project: PNG/85/001. Field Document No. 8
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    This document provides an analysis of the stomach contents of nearly all species that were collected during the field trips in the Sepik-Ramu catchment area made from January 1988 - September 1989 (Van Zwieten 1990a) . The stomach contents analysed in this report are in general taken from fish that were sampled during the whole sampling period from all areas covered. The data presented are averages from all the specimens of a single species analysed; no attempt has been made to unravel differenc es in feeding behavior as reflected by stomach contents in different size groups of species. Variations in stomach contents of specimens of one species collected, from different rivers are yet to be analysed. Furthermore it is not possible, as yet, to say anything about seasonal changes in feeding. These aspects will be considered in separate publications. For our purpose the present level of analysis is sufficient: the identification of vacant and underutilised trophic niches in the lower order streams of the Sepik-Rarnu catchment.
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