GMP checklist for open fish market

Hi everyone.

I need to make a GMP checklist for an open fish market situated next to the sea. Fishermen offload their catch at the market and sell the fish to vendors who process (scale, gut, clean) the fish in stalls located in an area covered with a roof and which has a tiled floor. 

However, there are no walls enclosing the facility and customers purchase the fish from the stalls. 

How for example, would the issue of pest control be dealt with?

Does anyone have a checklist applicable to an open fish market?

Thanks

Is it regulated?