To determine the catch efficiency of bottom vertical longline, 33 fishing operations were conducted in the Lamon Bay area, off the coast of Quezon Province from April to November 1988. Fishing data and catch composition were noted.
The fishing operations yielded a total catch of 1,212.8 kg or an average catch of 36.3 kg per fishing operation of three hours immersion in water. The catch was composed of snappers (32.9%), cavalla (16.5%), groupers (14.1%), Spanish mackerel (6.5%), barracuda (6.5%), dolphin fish (5.4%), shark (5.4%), eel (5.3%), lizard fish (2.9%), cownosed ray (1.85), and soldier fish (18%).
The study shows that bottom vertical longline is effective in catching demersal fishes. It can be operated in muddy, sandy, and rocky or reefy bottoms.