Name: Bountiful Ocean
Circles: Water / Summoning
Description: Doubles the the food and gold bonus from ocean, river and shore tiles. Each turn there is a small chance that whales or pearls spawn near any of your cities within sufficient range from ocean or shore that don't already have such resources.
Note: this spell is pretty obviously a prosperity spell but focuses on elements that water provides and depends on water tiles. I think it's a good fit and inclusion of rivers and shores makes it more versatile.
This spell would fit right in with the planned water focused DLC.
I think the name needs a tweak since it affects more than just ocean.