Pragmatic Play lists the volatility of Big Bass Bonanza as medium-high, although we find that it's on the higher end. Most can be won during the free spins feature, but it may take a while to trigger. There were also a significant amount of non-winning spins during normal game-play.
The standard RTP is 96.71%, which is higher than average for an online slot, but this figure may be different for players from different countries or at different casinos. You can find the RTP value in the game information at the casino where you're playing the slot.