You must define, before you ask or give judgement. No law, no crime, dude...
Fish imagery was used to live by the persecution, a kind of signal, to evade the friking Romans, that were killing you just because you smell different...You would have to be stupid if you did nothing to scape ("when you see Jerusalem surrounded by armies, flee...." was the admonition of Jesus).
The same case when the idiotic hitler (accursed be him) started to persecute all jews. Some of them escaped, leaving behind everything. Jesus said "they will throw you in prison and kill you; some will even think they are doing God a favour by killing you". So the fish was a SIGNAL. Not an object of worship.
Now, if you do not have the capacity to discern this - which is from this world - would you be able to discern higher things?