Backyard Aquaponics
A place to discuss aquaponics

Nup, they're as bad as each other. The difference is that the ammonia, once at toxic levels, will kill 'em faster.

I have never stopped feeding altogether
but thats me others may do it different

{Edit to be on the safe side stop till they all fall}

Is it then normal to have a nitrite spike after adding fish into a new system that had cycled but previously hadn't had any fish.
I didn't get a spike of any kind with the SP's but they were only 40mm when they went in, the trout are what they called advanced fingerlings & up to 150mm, so i'm guessing that would make quite a difference.

Certainly will make a difference - bigger change in biomass - it's not the number of fish that's important, but their overall weight.

It'd be nothing but an amazing coincidence if you happened to have your fishless cycling ammonia load the same as the ammonia load from the fish you introduce.

I agree with F&F, keep giving them a little bit of feed. You do need to be very watchful/careful, but I hate to see growing time totally going to waste

Patience definitely the most important component of an AP setup.
water test done this morning everything ok
ammonia 0
nitrite 0
trout fed like hungry lions this morning. After watching the timid SP's feed for the last few months, this was a lot more impressive.
Thank you all for your advice.