1) Added COLD_OCEAN biome.
Current biomes:
COLD_OCEAN,
OCEAN,
DEEP_OCEAN,
DEEP_COLD_OCEAN,
LUKEWARM_OCEAN,
DEEP_LUKEWARM_OCEAN
belong to the group: "oceans", and have the same fish.
2) Fixed a bug with the probability of catching tuna.
3) Added fish: "herring", which replaced the river fish in the ocean.