01/07/2023
It was with great interest to listen to an interview and read an article pertaining to the recent move by the SA Hunters Association this week encouraging hunters and farmers to change from lead based ammunition to alternatives.
The main reasons are firstly to reduce lead poisoning of untargeted wildlife, raptors and wetlands. Secondly, due to research which has shown that meat, within 20cm of the passage of a lead bullet, is contaminated with lead, and should not be consumed by both humans and wildlife.
They further encourage fisherman to not use lead sinkers as a means of stopping lead poisoning of the environment and aquatic predators.
The latter point is of particular interest, as it aligns with research by the Strandloper Project which demonstrates the impact of lead poisoning to inshore reef organisms by lost and abandoned lead sinkers from recreational fishermen.
Our ongoing 5 year research has revealed that lead sinkers are surrounded by a 'dead zone' which is dependent on the number of lead sinkers, ranging from between 3cm to 5cm for an accumulation of 5 to 10 sinkers and up to 70cm for 40 to 100 lead sinkers.
The good news is that, when the lead sinkers are removed from the reef, the algae and entrusting invertebrates recolonize the reef substrate within 10 to 12 months.
We have also documented an increase in juvenile and small bait fish species to areas of reef that have been cleared of of lead sinkers.
I hope that the awareness campaign by the SA Hunters Association is successful and that we see a significant move away from lead base ammunition and sinkers.
https://windmillsandsunbeams.wordpress.com/2020/01/18/casting-aside-lead-sinkers-for-an-eco-friendly-fishing-future/