M.C.L. Zoysa Presented at International Forestry and Environment Symposium 2009 at Department of Forestry and Environment Science, University of Sri Jayewardenepura, Sri Lanka from 18 – 19 December 2009 (Session 01 - Forest and Natural Resource Management

1. Effects of abiotic environmental factors on fish yield from traditional stilt fishery in Southern Sri Lanka . M.C.L. Zoysa 1 and U.P.K. Epa 2 ¹ National Institute of Fisheries and Nautical Engineering ² University of Kelaniya

3. Introduction

6. Materials and methods

8. Sampling sites Talpe Goviyapana Kubalgama 0 50 100km

15. Results

20. Variation of mean CPUE values for log transformed data of all three sampling sites 0.1 1 10 100 K/1 K/2 K/3 K/4 K/5 K/6 K/7 K/8 K/9 K/10 K/11 T/1 T/2 T/3 T/4 G/1 G/2 G/3 G/4 G/5 G/6 G/7 G/8 Sampling sites and dates Log fish catch per fishermen (catch/fishermen)

23. Variation of CPUE with Rainfall Talpe Kubalgama Goviapana y = 0.1103x + 0.1129 R 2 = 0.94 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 2 4 6 8 10 12 Rainfall (mm) CPUE (Kg/hr/fisherman)

25. Variation of mean catch and lunar phase (a) with first three quarters y =16.215x+97.847 R²=0.81 100 110 120 130 140 150 1 2 3 4 Lunar phase Mean catch (Kg) (a)

26. Variation of mean catch and lunar phase (b) with four quarters y = -7.73X+137.76 R²=0.128 75 95 115 135 155 0 1 2 3 4 Lunar phase Mean catch (kg) (b)

27. Discussion

30. THANK YOU