The cod fishing from Poole can be split into two different categories, traditional winter fishing at anchor and bottom fishing with bait (October to January), and summer fishing drifting well offshore with artificial lures (May & June). Tides don't affect the winter fishing much, the cod either feed or they don't, the summer fishing though is at the very least a lot easier and a lot more productive on a small tide. Cod, as one of my favourite fish to eat as long as there well in size,  are all fare game but I don't condone mass slaughter.