There are several ways for you to get Bait during the Season of the Deep and these come in different amounts based on what activities or actions you do.
Destiny 2 fishing, including how to fish and how to get bait
Destiny 2 fishing, including how to fish and how to get bait
FASTEST farm for Bait (4 every 30s) EXTREMELY FAST! Fishing - Season of the Deep
Destiny 2: How to fish, focused fishing & perfect catches - Dexerto
Destiny 2 HOW TO FISH! [How To Catch Exotic Fish]
Destiny 2 fishing, including how to fish and how to get bait
Destiny 2 fishing, including how to fish and how to get bait
Best Way To Farm Bait So You Can Spend More Time Fishing..!
Destiny 2 fishing guide, Bait farm, and Focused Fishing