Mods for Minecraft Java
Browse 1,192 free mods for Minecraft Java — popular picks include Marine biology, The Aquatic UpdateV2, Faentum's Deep Sea Expansion.
Step by step: How to install Minecraft Java mods & modpacks
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Marine biology
A mod that diversifies the oceans and adds several marine mammals from the cetacean family. Currently, the largest is the humpback whale. There is also a bowhead whale that you can ride. Smaller ones include the beluga whale, the pilot whale,
The Aquatic UpdateV2
Add Special Items from the Aquatic Update to 1.20

Faentum's Deep Sea Expansion
Deep Oceans are no more safe, Dare to Face the Abyss!
Pets Load Chunks
Loads the chunks tamed pets are in, enabling use of them as chunk loaders while they're sitting around and fixing teleportation across oceans.
oceans biomes
Create worlds made entirely of oceans with a simple configuration screen. Choose the ocean biome, tweak depth, and enable or disable islands and ocean structures.
ROTP-Jumpin-Jack-Flash
Added the Stand "Jumpin' Jack Flash" from Stone Ocean.Features: barrage, heavy punch, scatter bullet, and gravity manipulation ability.
Seafarer[Fabric]
A port of the Seafarer[Forge] Version. This is a mod that aims to improve the Minecraft Oceans and its surroundings.
Fishbowl
Adds a fishbowl curios equipable that allows merfolk and other ocean-dwelling origins to breathe on land.
No Air Mining Penalty
removes the default mining speed penalty when the player is underwater or not standing on solid ground
Pride Blåhaj Backport
Backports the Blahåj Replushed mod's newer pride sharks to 1.20.1.
Ocean Floating Lifebelts
Adds 9 new floating lifebelts to ocean biomes
CinderStride – Lava Walker
A rare Bastion relic grants Lava Walker boots, letting you walk across lava and turn the Nether’s oceans into your highway.
FandomCraft Infinite
Now you can play your favorite games in Minecraft! This mod adds features from many games and media such as Kingdom of Hearts, Legend of Zelda, Star Ocean, Final Fantasy, Fringe, and many more
Leviathan
A new oceanic mob for Minecraft 1.20+
Dolphin Boots
this lightweight mod adds boots that make you fast underwater
Ore Minus
Customize Minecraft ore spawn rates by biome. Easily set multipliers for vanilla and modded ores (e.g., 2x diamonds in deserts, zero coal in ocean). Essential modpack ore distribution tool.
Vulcade
Post-processing shader packs that run on Minecraft's Vulkan renderer. Bloom, sun glare, volumetric light shafts, ore glow, plus dedicated underwater, Nether and End looks — with Low/Medium/High/Ultra profiles.
Monster Origins
(WIP) Minecraft 1.20.1 (and now 1.21.1) / Fabric addon for Origins that adds four origins Arachne (a humanoid spider), Medusa (a gorgon), Harpy (a storm-wind bird-woman), and Mermaid (a singer of the deep) each built around a different playstyle
Colorful Sea Lanterns
Adds craft-able sea lanterns of all dye colors.
Aquatic Plugin
This is a Minecraft Plugin wich adds many Ocean and Fish releated things to Minecraft

Realistic Oceans
Adds realistic & deep oceans to minecraft
Sea eater: ocean horror
something unknown fell into the ocean

Oceanic sword remastered
Adds a mythical pirate blade to your world allowing you to harness the power of the seas.
Sea Things
This mod make prismarite very good. Sea Things show you the power of Oceans, Guardians and etc.
Single Island Generator
A Minecraft world generation mod that adds an Island world type, generating an ocean-only world with one randomly generated survival island.
Tek N Astra (Sea of Dreams)
This mod aims to add way more content to the game, especially post-Ender Dragon part of the game!
Improved Rails (TURNABLE POWERED RAILS)
Underwater-version Rails! Rails that's always activated!
Grassidium
Makes plants alive! Grass, flowers, underwater, and modded plants spread and grow dynamically based on their environment.
Lost Island
Lost Island is a Minecraft mod that places you on a tiny island in an endless ocean. Survive with scarce resources while floating barrels bring supplies to your shore. Early release — bugs may occur.
Drown Panic
"An immersive mod that enhances survival atmosphere underwater with a wide screen vignette (tunnel vision) and realistic heartbeat sounds when drowning."
overworld underground Lava remover, and underground water remover separate files
Simply removes underground lava and water only in the overworld, be aware the water remover will make pockets of air to deep rivers and wont work on ocean biomes and its underground
Sea of Steves
Boat battle plugin for Minecraft servers
Simple Submarines
Adds submarines for underwater exploration.
Fish Rework - Fishing
A plugin that reworks the fishing mechanic, by fishing up unique sea creatures instead of normal fish. Custom drops, items, armor, weapons, skill progression, recipes, custom GUI, advancements, artifacts and more.
Aquaticworld
This mod adds 5 new creatures to diversify the oceans.The mod will also add 9 new structures and their prehistory.The mod is based on the game "Subnautica"
Aqualung
The recipe combines glass, a nautilus shell and a turtle scute to create a useful diving item for long underwater trips.