nmoiras said:
Furthermore the presence of divers is strictly restricted to the upper zone, where photosynthesis takes place and the whole food circle starts.
Yes. But shooting a fish in 0-10m doesn't disrupt photosynthesis.
The last time I shot my baglimit of Algae and Phytoplankton was a long time ago... These days I focus on the much bigger Zooplankton. My best is a Cophepod of 0.5mm. Massive... rofl
The photosynthetic zone is home to the plankton feeders. Unless you are targeting these baitfish you will have little effect on the food chain carry through. There is
no way you can have an affect on the fundamental level of the food chain by "forcing" plankton feeding fish deeper. They have to eat, so they have to feed at, or near the surface. Predatory fish like the groupers may well find homes in deep water to escape daytime annoyances, but they still need to eat... Unless you spend 24hrs in the water, theres no way you can say "spearo X has caused fish Y to migrate to deeper water".
Fact: In NSW (Australia) spearfishing is very popular.
Fact: In NSW spearfishing represents less than 2% of the recreational fishing effort.
Fact: Fisheries scientists acknowledge spearfishing as the most sustainable and least harmful form of fishing.
What the European fisheries bodies need to do is grow some balls, and start thinking of the future. The NA Cod fishery has been wiped out, due to political inertia. The Med is a stagnant pond of pollutants. Time to start making the polluters pay, and pay dearly. But with so many countries having coastline, its going to be a political sh*tfight to get anything done. And then theres the Japanese with their driftnets, after the EU banned Euro countries from using them in the Med... :rcard