plumbeus catch was significantly reduced with the use of electropositive metals on longline hooks; however, preliminary laboratory investigations have demonstrated that juvenile C.
The repulsive and feeding deterrent effects of electropositive metals on juvenile sandbar sharks (Carcharhinus plumbeus).
A shocking discovery: How electropositive metals (EPMs) work and their effects on elasmobranchs.
Assessment of permanent magnets and electropositive metals to reduce the line-based capture of Galapagos sharks, Carcharhinus galapagensis.
Our studies are designed to determine if electropositive metals affect the behaviors of juvenile sandbar sharks (Carcharhinus plumbeus) under both laboratory and field conditions.
Our experiments with captive sandbar sharks include tests of the ability of electropositive metals to influence the swimming patterns of individual animals in the absence of food motivation and to repel sharks from pieces of cut bait.
At the start of the second hour the string of lead fishing weights was quietly removed and immediately replaced with either a string of three electropositive metal bars, or the string of lead fishing weights was placed back into the tank.
The three electropositive metal bars (~2 cm x 2 cm x 10 cm) comprised neodymium (76%), praseodymium (23%), and minor amounts (< 0.
Shark positions were translated into quantifiable behaviors by calculating the distances between the sharks and the electropositive metal or lead weights from the one-second interval location records.
The digital position records were also used to calculate swimming speeds, which were subsequently segregated into swimming speeds recorded when the fish was within 100 cm of the electropositive metal bars or lead fishing weights, and into swimming speeds recorded when the fish was further than 100 cm from the electropositive metal bars or lead fishing weights.
Groups of sharks maintained in the outdoor circular fiberglass holding tank were used to determine the ability of electropositive metals to deter sharks from attacking bait.