minecraft_server_zombie/config/alexsmobs/catfish_spawns.json

{
  "biomes": [
    [
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "overworld"
      },
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "swamp"
      }
    ],
    [
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "overworld"
      },
      {
        "type": "BIOME_DICT",
        "negate": false,
        "value": "river"
      },
      {
        "type": "BIOME_DICT",
        "negate": true,
        "value": "cold"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "terralith:orchid_swamp"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "terralith:ice_marsh"
      }
    ],
    [
      {
        "type": "REGISTRY_NAME",
        "negate": false,
        "value": "terralith:warm_river"
      }
    ]
  ]
}