General Information
Collection Site Name: |
Tsinjomorona - ARS/TR-25/IX/06-1 |
Co-ordinates: |
15° 03’ 11" S 48° 11’ 27" E 443 feet above sea level |
Type of Site: |
Riverine Width at date: 5’ (two braids equalling 10’ total) Width at high water: 25’ (evidenced by debris jams, depth would then be 3’) |
Nearest Village/Town: |
Fifty kilometers west of Befandriana |
Watershed/Tributaries: |
Tributary of the Loza river |
Site Details
Water Parameters: |
pH: 7.85 Temperature: 82.4°F Conductivity: 234.0µS |
Substrate: |
Bedrock and boulder bottom interspersed with gravel and sand (20:80). Large amount of leaf little present in pools. |
Vegetation: |
No instream vegetation noted Riparian zone extends 15-20’ on either side and has a canopy height of 20-25’. |
Morphology: |
Riffle-Pool-Riffle morphology Riffles are 8" deep; Pools are up to 20" deep. |
Collection Details
Date/Time Collected: |
September 23th, 2006 @ 5:27 p.m. |
Collection Methods: |
Dip net, and seine (although seine proved too unwieldy for much of the river). |
Species Collected: |
Pachypanchax sp. affn. sparksorum Tillapia sp. |
Population Numbers: |
Twenty-five P. sp. affn. sparksorum captured in one hour by two people with dip nets. Size range of specimens was 1.5-3.0" T.L., with the majority being sub-adult individuals. |
Other Information
General Comments: |
Pachypanchax were collected in deeper parts of pools still receiving flowing water, usually over predominately sand substrate receiving some non-filtered light |