Renato C. Diocton
Samar State University, Philippines
Renato C. Diocton has his expertise in assessment and evaluation in improving the coastal zone and marine protected areas.. He has been involved several project on coastal aquaculture and fisheries biology particularly on marine biodiversity. Recent project was on the use of square mesh windows and tortoise shape of mesh in cod end of shrimp trawl fisheries. He has been involved in the promotion of Ecosystem Approach to Fisheries management (EAFM) to local government units in the Samar province to substitute the traditional tool to fisheries management that is Coastal Resource Management to allow new tools to manage complex ecosystem lie the Samar Sea. Code of conduct on responsible fisheries (CCRF) is one of the major activities in the near future that is to be implemented by the university.
The study was conducted to determine and evaluate the effectiveness of square and tortoise type windows on shrimp trawl with an aim to minimize and regulate the bycatch within shrimp trawlers in Samar Sea. Results showed that there is no statistically significant difference in escapement or bycatch reduction using square mesh and tortoise shaped windows in the codend (P≤0.05). Bycatch forms an average 24% of the total catch at a relative fishing efficiency of 4.7 kg per hour of towing. Dominant species exploited was from the family Leiognathidae (slipmouths), forming 71% of the total catch when using the two window types. Although statistically not significant, we recommend using the tortoise shaped window which has a higher mean length escapement compared to the square mesh window. Its tortoise shaped mesh opening favors escapement of deep bodied fishes such as slipmouth. It could as well increase fish survival after escapement due to its shape that reduces contact to the window as fish escapes.