Because we have natives that are at risk of any possible diseases that they could bring in, also a huge crayfish industry as well
No import health standard has been developed for them http://www.mpi.govt.nz/importing/overview/import-health-standards/
Had a very juvenile School Shark (Tope) brought in today, had been caught in a flounder net and had a bite mark on its right hand gill.
Have placed it in the big temperaste tank but had to remove the hermit crabs as they wouldn't leave it alone to settle in properly.
Agree it may be caused by ammonia in the water, Do a 25% waterchange and ensure the filter stays on
Feeding less and more often will help the system run better and ensue the fish have a better environment
Once you have the tank established when adding new fishjust test for ammonia rising and do a water change if necessary, nitrifying bacteria multiply pretty fast
Have added another sump to house skimmer and return pump, this sits under the bigger tank at the back, will take out the trickle filter and add an algae scrubber then turn first compartment into a refugium.
Put tank in place at the end of the 1700 litre tank which is 1.2 metres wide.
Moved everything from the small tank over, pair of Mandarins and pair of Bangai. will add more live rock next
Then add another sump onto it