As @swampster said, and as @cammie and @teellbee confirmed, it IS because of a lack of accessibility. We are interested! 
Some of the equipment that I’ve used in the “ancient past” (in the pre-iNatting days), to get my hands on fish, and to get my camera on fish, include:
- Trawl nets
- Beach seines
- Purse seines
- Cast nets
- Gill nets
- Boats
- Dip nets
- Fishing rods
- Minnow traps
- Etc.
That’s a lot of gear! You could fill a tractor trailer with the gear required for fish observations!
But there is a solution to the problem that you mentioned:
One solution is that many people are already using that gear all the time: fishermen, campers, etc. It’s a matter of building awareness that iNaturalist exists. To anyone reading this (not just @jasonhernandez74), you can build awareness of iNat, in this fishing population, in many different ways. Here are a few ideas:
- You could run an iNat booth at an outdoors show, a fishing show, or a camping show
- You could make more iNat-related posts on social media
- You could post in fishing forums and message boards
- You could volunteer at fishing tournaments
- You could engage local campgrounds
- You could network with local outdoors stores, like Bass Pro Shops
- You could network with your state department of game and fish
Let’s dive into these outreach methods! We can cast a wide net and reel in a wave of observations from fishermen and campers. Tight lines!