First mistake, [CIV_CONTROLLABLE] is for dwarves only. Removed.
Due to body restrictions, they cannot wear pants. All lower body items removed.
A non-mountainous race should not have [SUBTERRANEAN_CLOTHING].
Most toys and trap comps not needed.
[MAYOR] removed, since they're not democratic or anything.
Likewise, [KING]ship replaced with [CAN_HAVE_MILITARY_SITE_LEADER], as would be appropriate for warmongers.
Symbol selection tokens were same as dwarves. Changed to [EVIL] and [AQUATIC], as appropriate.
Site support was not set to have [liKES_SITE:DARK_FORTRESS], which is needed.
Biome support was the same as dwarves. Changed to something more appropriate (wetlands)
Changed religion spheres.
Changed active season to Spring, you can fix that however you like.
Removed all plant-related jobs in allowed jobs.
The result should be a carnivorous race which inhabits watery areas (rivers, lakes, oceans, wetlands) almost exclusively, and attacks regularly... rather than copy-pasted dwarves. Enjoy, tell us how that turns out.
[ENTITY:RAIDING]
[CREATURE:SNAKEMAN]
[TRANSLATION:DWARF]
[DIGGER:ITEM_WEAPON_PICK]
[WEAPON:ITEM_WEAPON_AXE_BATTLE]
[WEAPON:ITEM_WEAPON_HAMMER_WAR]
[WEAPON:ITEM_WEAPON_SPEAR]
[WEAPON:ITEM_WEAPON_MACE]
[WEAPON:ITEM_WEAPON_CROSSBOW]
[AMMO:ITEM_AMMO_BOLTS]
[ARMOR:ITEM_ARMOR_PLATEMAIL:COMMON]
[ARMOR:ITEM_ARMOR_CHAINMAIL:COMMON]
[ARMOR:ITEM_ARMOR_LEATHER:COMMON]
[ARMOR:ITEM_ARMOR_COAT:COMMON]
[ARMOR:ITEM_ARMOR_SHIRT:COMMON]
[ARMOR:ITEM_ARMOR_CLOAK:COMMON]
[ARMOR:ITEM_ARMOR_TUNIC:COMMON]
[ARMOR:ITEM_ARMOR_TOGA:UNCOMMON]
[ARMOR:ITEM_ARMOR_VEST:COMMON]
[ARMOR:ITEM_ARMOR_DRESS:COMMON]
[ARMOR:ITEM_ARMOR_ROBE:COMMON]
[HELM:ITEM_HELM_HELM:COMMON]
[HELM:ITEM_HELM_CAP:COMMON]
[HELM:ITEM_HELM_HOOD:COMMON]
[GLOVES:ITEM_GLOVES_GAUNTLETS:COMMON]
[GLOVES:ITEM_GLOVES_GLOVES:COMMON]
[GLOVES:ITEM_GLOVES_MITTENS:COMMON]
[SHIELD:ITEM_SHIELD_SHIELD]
[SHIELD:ITEM_SHIELD_BUCKLER]
[TOY:ITEM_TOY_HAMMER]
[TOY:ITEM_TOY_AXE]
[INSTRUMENT:ITEM_INSTRUMENT_FLUTE]
[INSTRUMENT:ITEM_INSTRUMENT_TRUMPET]
[INSTRUMENT:ITEM_INSTRUMENT_DRUM]
[CLOTHING]
[CURRENCY_BY_YEAR]
[CURRENCY:COPPER:1]
[CURRENCY:SILVER:5]
[CURRENCY:GOLD:15]
[SELECT_SYMBOL:WAR:NAME_WAR]
[SUBSELECT_SYMBOL:WAR:VIOLENT]
[SELECT_SYMBOL:BATTLE:NAME_BATTLE]
[SUBSELECT_SYMBOL:BATTLE:VIOLENT]
[SELECT_SYMBOL:SIEGE:NAME_SIEGE]
[SUBSELECT_SYMBOL:SIEGE:VIOLENT]
[SELECT_SYMBOL:ROAD:NAME_ROAD]
[SELECT_SYMBOL:TUNNEL:NAME_TUNNEL]
[SELECT_SYMBOL:BRIDGE:NAME_BRIDGE]
[SELECT_SYMBOL:WALL:NAME_WALL]
[SELECT_SYMBOL:REMAINING:EVIL]
[SELECT_SYMBOL:REMAINING:AQUATIC]
[CULL_SYMBOL:ALL:DOMESTIC]
[CULL_SYMBOL:ALL:SUBORDINATE]
[CULL_SYMBOL:ALL:UNTOWARD]
[CULL_SYMBOL:ALL:FLOWERY]
[CULL_SYMBOL:ALL:UGLY]
[USE_EVIL_ANIMALS]
[USE_ANIMAL_PRODUCTS]
[EQUIPMENT_IMPROVEMENTS]
[ART_IMAGE_ELEMENT_MODIFIER:PLANT:64]
[ART_IMAGE_ELEMENT_MODIFIER:TREE:64]
[ITEM_IMPROVEMENT_MODIFIER:RINGS_HANGING:64]
[ITEM_IMPROVEMENT_MODIFIER:BANDS:384]
[ITEM_IMPROVEMENT_MODIFIER:SPIKES:384]
[ADVENTURE_TIER:4]
[FRIENDLY_COLOR:1:0:1]
[DEFAULT_SITE_TYPE:DARK_FORTRESS]
[LIKES_SITE:DARK_FORTRESS]
[TOLERATES_SITE:CITY]
[TOLERATES_SITE:TREE_CITY]
[TOLERATES_SITE:CAVE_DETAILED]
[CAN_HAVE_MILITARY_SITE_LEADER]
[START_BIOME:ANY_RIVER]
[BIOME_SUPPORT:ANY_FOREST:1]
[BIOME_SUPPORT:ANY_RIVER:3]
[BIOME_SUPPORT:ANY_WETLAND:1]
[BIOME_SUPPORT:ANY_LAKE:1]
[BIOME_SUPPORT:ANY_OCEAN:1]
[ACTIVE_SEASON:SPRING]
[SIEGER]
[MAX_STARTING_CIV_NUMBER:100]
[START_GROUP_NUMBER:10]
[MAX_POP_NUMBER:10000]
[MAX_SITE_POP_NUMBER:120]
[RELIGION:PANTHEON]
[RELIGION_SPHERE:WATER]
[RELIGION_SPHERE:DEATH]
[RELIGION_SPHERE:MISERY]
[WANDERER]
[BEAST_HUNTER]
[SCOUT]
[PERMITTED_JOB:MINER]
[PERMITTED_JOB:CARPENTER]
[PERMITTED_JOB:BOWYER]
[PERMITTED_JOB:WOODCUTTER]
[PERMITTED_JOB:ENGRAVER]
[PERMITTED_JOB:MASON]
[PERMITTED_JOB:ANIMAL_CARETAKER]
[PERMITTED_JOB:ANIMAL_TRAINER]
[PERMITTED_JOB:HUNTER]
[PERMITTED_JOB:TRAPPER]
[PERMITTED_JOB:ANIMAL_DISSECTOR]
[PERMITTED_JOB:FURNACE_OPERATOR]
[PERMITTED_JOB:WEAPONSMITH]
[PERMITTED_JOB:ARMORER]
[PERMITTED_JOB:BLACKSMITH]
[PERMITTED_JOB:METALCRAFTER]
[PERMITTED_JOB:GEM_CUTTER]
[PERMITTED_JOB:GEM_SETTER]
[PERMITTED_JOB:WOODCRAFTER]
[PERMITTED_JOB:STONECRAFTER]
[PERMITTED_JOB:LEATHERWORKER]
[PERMITTED_JOB:BONE_CARVER]
[PERMITTED_JOB:WEAVER]
[PERMITTED_JOB:CLOTHIER]
[PERMITTED_JOB:GLASSMAKER]
[PERMITTED_JOB:STRAND_EXTRACTOR]
[PERMITTED_JOB:FISHERMAN]
[PERMITTED_JOB:FISH_DISSECTOR]
[PERMITTED_JOB:FISH_CLEANER]
[PERMITTED_JOB:COOK]
[PERMITTED_JOB:THRESHER]
[PERMITTED_JOB:BUTCHER]
[PERMITTED_JOB:TANNER]
[PERMITTED_JOB:DYER]
[PERMITTED_JOB:SOAP_MAKER]
[PERMITTED_JOB:POTASH_MAKER]
[PERMITTED_JOB:LYE_MAKER]
[PERMITTED_JOB:WOOD_BURNER]
[PERMITTED_JOB:MECHANIC]
[PERMITTED_JOB:SIEGE_ENGINEER]
[PERMITTED_JOB:SIEGE_OPERATOR]
[PERMITTED_JOB:PUMP_OPERATOR]
[PERMITTED_JOB:CLERK]
[PERMITTED_JOB:ADMINISTRATOR]
[PERMITTED_JOB:TRADER]
[PERMITTED_JOB:ARCHITECT]
[WORLD_CONSTRUCTION:TUNNEL]
[WORLD_CONSTRUCTION:BRIDGE]
[WORLD_CONSTRUCTION:ROAD]
[ETHIC:KILL_ENTITY_MEMBER:ACCEPTABLE]
[ETHIC:KILL_NEUTRAL:ONLY_IF_SANCTIONED]
[ETHIC:KILL_ENEMY:ACCEPTABLE]
[ETHIC:KILL_ANIMAL:ACCEPTABLE]
[ETHIC:KILL_PLANT:ACCEPTABLE]
[ETHIC:TORTURE_AS_EXAMPLE:ACCEPTABLE]
[ETHIC:TORTURE_FOR_INFORMATION:ACCEPTABLE]
[ETHIC:TORTURE_FOR_FUN:UNTHINKABLE]
[ETHIC:TORTURE_ANIMALS:UNTHINKABLE]
[ETHIC:TREASON:PUNISH_CAPITAL]
[ETHIC:OATH_BREAKING:PUNISH_CAPITAL]
[ETHIC:LYING:PERSONAL_MATTER]
[ETHIC:VANDALISM:PUNISH_SERIOUS]
[ETHIC:TRESPASSING:PUNISH_SERIOUS]
[ETHIC:THEFT:PUNISH_SERIOUS]
[ETHIC:ASSAULT:PUNISH_SERIOUS]
[ETHIC:SLAVERY:ACCEPTABLE]
[ETHIC:EAT_SAPIENT_OTHER:ACCEPTABLE]
[ETHIC:EAT_SAPIENT_KILL:UNTHINKABLE]
[ETHIC:MAKE_TROPHY_SAME_RACE:APPALLING]
[ETHIC:MAKE_TROPHY_SAPIENT:ACCEPTABLE]
[ETHIC:MAKE_TROPHY_ANIMAL:ACCEPTABLE]