Coconuts durability will make us surprise.
Traditional fishermen use coconut fronds (Cocos nucifera) as attractors in Fish Aggregating Devices (FADs) to attract and aggregate fish in the sea. The attractors are commonly referred to as `natural attractors’ for FADs. Durability of coconut frond attractor has become an important point to minimize the maintenance cost and also to protect amount of fish around FADs. This study was conducted to investigate the durability level of coconut frond attractors for FADs taken from different distances (500 m, 1,000 m and 1,500 m) from the coast and placed in 23-30 m depth of water. Scuba diving was conducted to take frond samples once every two weeks until the fronds totally rot. The durability of coconut fronds was also determined in a controlled system where the experiment was carried out in a water tank to mimic the natural conditions. A total of 252 samples were obtained and investigated using Scanning Electron Microscopy. Results of adaxial and the abaxial epidermis analysis showed that the periods of immersion in the sea influence the epidermis thickness, hence the durability of the attractors (P < 0.05). Descriptive analysis of epidermis thickness showed that coconut fronds taken from 500 m and 1,000 m from the coast are more durable than fronds taken from 1,500 m from the coast. This finding is very important in the production of durable FADs.
A funny clip about coconut durability:
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