Effects of soaking on artisanal polyvinyl-alcohol (PVA) synthetic fishing twine in freshwater, brackish and marine waters
Elongation (cm) and breaking-load (kgf) effects on artisanal Polyvinyl-Alcohol (PVA) synthetic twine of diameters 4mm, 6mm, 8mm and I0mm soaked in fresh (0.4ppt), brackish (25ppt) and marine (37ppt) waters for 112 days were investigated. Chemical (burning) test was carried out to identify the experimental white twine as PVA, among other six locally synthetic twines (Klust, 1973). A tensile-strength gauge machine (0-200kg) was used to test the mechanical strength properties of PVA twine diameters in dry (control) and wet states. Results indicated that elongation and breaking-load of the specimens were significantly (P<0.05) influenced by R- Tex. Elongation and breaking-load were observed to be highest in dry twine 10mm with means of 20.75a ~c 1.05 and 140.00a ~c 5.37 respectively, higher in twine 10mm (with means of 20.40b ~c 3.50 and 131.75b ~c 5.l0 respectively) soaked in freshwater and lowest in twine 4mm (means of 1 4.83fg ~c 0.31 and 33.70h ~c 1.00 respectively) soaked in marine water. Twines of the same diameter (l0mm, 8mm, 6mm & 4mm) soaked in fresh water (0.7ppt) has highest significant (p<0.05) elongation and breaking load than those soaked in brackish (0.25ppt) and marine water respectively. The thicker the PVA twine diameter, the higher the significant (p<0.05) elongation and breaking load, which could lead to increased mesh sizes of fishing nets constructed from such twines. Fishermen are therefore encouraged to air-dry their fishing nets or gears when not in used to extend the shelf-life.
| Main Authors: | , , , , |
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| Format: | conference_item biblioteca |
| Language: | English |
| Published: |
FISON
2012
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| Subjects: | Fisheries, Nigeria, Ogun state, Artisanal fishing, PVA synthetic twine, Freshwater, Brackishwater, Marine water, brackishwater environment, freshwater environment, marine environment, Yarns, Synthetic fibres, Fishermen, Fishing nets, Fishing gear, Comparative studies, Air exposure, Netting materials, Gear research, Tensile strength, Materials testing, Saline water, Fresh water, Brackish water, |
| Online Access: | http://hdl.handle.net/1834/38873 |
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