Welcome to Fins and Tails, this mod that aims to add more fictional ambient life to your Minecraft world, ranging from small fish to strange crustaceans, all designed to spice up your gameplay. Currently, the mod adds 25 creatures.

The current creatures this mod adds are:

Blu Wee
Pea Wee
Banded Redback Shrimp
Teal Arrowfish
Swamp Mucker
Flatback Sucker
High-finned Blue
Mudhorse
Ornate Bugfish
Phantom Nudibranch
Penglil
Spindly Gem Crab
Flatback Leaf Snail
Red Bull Crab
White Bull Crab
Wee Wee
Vibra Wee
River Pebble Snail
Siderol Whiskered Snail
Golden River Ray
Night Light Squid
Gopjet
Rubber Belly Glider
Papa Wee
Wherble
Crowned Horatee

Along with those creatures, this mod also adds a few other things, such as:

Food items for most of the creatures
Mudhorse Pouch, an item that can store up to 9 items inside of it
Fwinged Boots, a new armor piece that increase swimming speed, but make you slower on land
Spindly Gem Charm, another armor piece that gives a few effects when worn, but breaks shortly after
Red/White Bull Crab Gauntlet
Many snail shell blocks
Three new enchantments
Fluked Edge allows the wearer to jump out of water if they're at the right angle
Uppercutting makes mobs get thrown up into the air a few blocks when they're attacked in water
Crab's Favor makes mobs drop more experience when killed
Swamp digeridoo, an item used to command mudhorses to fight for you
Two new banner patterns
Gopjet Jetpack, a new armor piece that allows you to fly through the air when above water, or if you have water bottles or water buckets in your inventory
Armored Gopjet Jetpack, same concept as the regular but more stylish and gives you armor points
Spindly Emerald/Ruby/Pearl/Amber/Sapphire Charms, armor pieces which give a unique effect at the cost of durability