Fishing

I'm nearing 76 fishing now and I'm wondering..

At what lvl is it a good idea to start fishing sharks
Also, how long does it usually take to fish 1k sharks?

85-90 Stick with lobs / monkfish until then its faster

Some people say it's better to start fishing sharks at 80+ or 90+ is even better.

For cash though, monkfish are a lot better because their faster to fish.

I dont think sharks are good until 95+ really

Got 99 fishing and there still slow, do monks.

Thanks for all your help guys!