Technical and Design Characteristics of Trammel Nets Used in Lake Manzalah, Egypt | ||
| Egyptian Journal of Aquatic Biology and Fisheries | ||
| Article 1, Volume 21, Issue 3, July 2017, Pages 1-10 PDF (194.72 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejabf.2017.3535 | ||
| Author | ||
| El-Azab El-Azab El-Bokhty* | ||
| Fisheries Dept., NIOF, Egypt | ||
| Abstract | ||
| The present research was carried out during Autumn 2016 with the aim of studying the technical and design characteristics of the widely used trammel nets in Lake Manzalah, as an attempt to be one of a data base that describe the different fishing gears used in Egypt. A number of net units were randomly used as samples. Results showed that such nets are used in collaboration with small fishing wooden boats (canoes) reinforced with a layer of fiber glass of the third class with an average number of 2 men. The dimensions of trammel net unit ranged between 20 and 25 meter long and a height of 0.5 to 1 meter. Trammel nets are formed of three netting panels, the stretched mesh size of the middle layer averaged # 40.82 mm while that of the outer layer was 125.24 mm. The upper and lower ropes were locally made of 3- strand staple fibers. Small sized cork floats were mounted on the upper rope (av. # 3 / 1 m) and lead sinkers to the lower rope (av. # 5 – 6 piece / m) of a total weight of 2-3 Kg per net unit. The netting materials were of polyamide monofilament of an average diameter (ɸ) 0.126 mm for the inner layer and ɸ 0.22 mm for the outer one. The horizontal hanging coefficients ranged between 0.60 and 0.70 for the outer layers and between 0.40 and 0.55 for the inner one. The results showed that such nets don't match the criteria for catching moderately sized fish (Average length 15 cm) of tilapia especially the mesh opening of the inner layer for conserving the fishery stocks and sustainable fishery. | ||
| Keywords | ||
| Trammel nets; design; Lake Manzalah; Egypt | ||
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