"People using set nets need to remember they catch more than just fish. Penguins, shags, dolphins and seals can all find their way into a set net and drown.
"We recommend people stay with their net if possible to help avoid other animals getting caught," he said.
Mr Rudsdale said fishery officers had noticed an increasing number of illegally set nets in the past few months and was reminding fishers of the rules, which included "set nets must not cover more than one quarter of any waterway, set nets must not be left to strand fish by the falling tide and set nets must have surface floats at each end, clearly marked with a surname and initial (MPI recommends a phone number)".
For information on set netting visit www.mpi.govt.nz, call the Whangarei MPI office 09470 0580 or download the free fisheries "app" by texting the word "app" to 9889.
-If you see any suspicious fishing activity call 0800 4 POACHER (0800 4 76 224).