[CREATURE:FISH_CARP_ARM]
[DESCRIPTION:A medium-sized fish found in lakes and streams. They are bottom-feeders and tend to gather groups. For some reason, they have arms.]
[NAME:arm carp:arm carp:arm carp]
[CASTE_NAME:arm carp:arm carp:arm carp]
[CHILD:1][GENERAL_CHILD_NAME:arm carp fry:arm carp fry]
[CREATURE_TILE:224][COLOR:3:0:0]
[LARGE_ROAMING]
[EQUIPS]
[AQUATIC][UNDERSWIM][IMMOBILE_LAND]
[BENIGN][MEANDERER][NATURAL]
[PETVALUE:50]
[BIOME:RIVER_TEMPERATE_FRESHWATER]
[BIOME:RIVER_TROPICAL_FRESHWATER]
[BIOME:LAKE_TEMPERATE_FRESHWATER]
[BIOME:LAKE_TROPICAL_FRESHWATER]
[POPULATION_NUMBER:15:30]
[CLUSTER_NUMBER:5:10]
[PREFSTRING:irrational arms]
[BODY:BASIC_2PARTBODY:BASIC_HEAD:SIDE_FINS:DORSAL_FIN:TAIL:2EYES:HEART:GUTS:ORGANS:NECK:SPINE:BRAIN:SKULL:MOUTH:RIBCAGE:BASIC_3PARTARMS:3FINGERS]
[BODY_DETAIL_PLAN:STANDARD_MATERIALS]
[REMOVE_MATERIAL:SKIN]
[REMOVE_MATERIAL:LEATHER]
[REMOVE_MATERIAL:HAIR]
[USE_MATERIAL_TEMPLATE:SCALE:SCALE_TEMPLATE]
[BODY_DETAIL_PLAN:STANDARD_TISSUES]
[REMOVE_TISSUE:SKIN]
[REMOVE_TISSUE:HAIR]
[USE_TISSUE_TEMPLATE:SCALE:SCALE_TEMPLATE]
[BODY_DETAIL_PLAN:VERTEBRATE_TISSUE_LAYERS:SCALE:FAT:MUSCLE:BONE:CARTILAGE]
[SELECT_TISSUE_LAYER:HEART:BY_CATEGORY:HEART]
[PLUS_TISSUE_LAYER:SCALE:BY_CATEGORY:THROAT]
[TL_MAJOR_ARTERIES]
[BODY_DETAIL_PLAN:STANDARD_HEAD_POSITIONS]
[BODY_DETAIL_PLAN:HUMANOID_RIBCAGE_POSITIONS]
[USE_MATERIAL_TEMPLATE:SINEW:SINEW_TEMPLATE]
[TENDONS:LOCAL_CREATURE_MAT:SINEW:200]
[LIGAMENTS:LOCAL_CREATURE_MAT:SINEW:200]
[HAS_NERVES]
[SPEED:2900]
[USE_MATERIAL_TEMPLATE:BLOOD:BLOOD_TEMPLATE]
[BLOOD:LOCAL_CREATURE_MAT:BLOOD:LIQUID]
[CREATURE_CLASS:GENERAL_POISON]
[GETS_WOUND_INFECTIONS]
[GETS_INFECTIONS_FROM_ROT]
[USE_MATERIAL_TEMPLATE:PUS:PUS_TEMPLATE]
[PUS:LOCAL_CREATURE_MAT:PUS:LIQUID]
[BODY_SIZE:0:0:4000]
[BODY_SIZE:1:0:20000]
[BODY_SIZE:5:0:40000]
[BODY_APPEARANCE_MODIFIER:LENGTH:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:HEIGHT:90:95:98:100:102:105:110]
[BODY_APPEARANCE_MODIFIER:BROADNESS:90:95:98:100:102:105:110]
[MAXAGE:20:30]
[ATTACK:BITE:BODYPART:BY_CATEGORY:MOUTH]
[ATTACK_SKILL:BITE]
[ATTACK_VERB:bite:bites]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:MAIN]
[ATTACK_FLAG_CANLATCH]
[ATTACK:SLAP:BODYPART:BY_CATEGORY:TAIL]
[ATTACK_SKILL:STANCE_STRIKE]
[ATTACK_VERB:slap:slaps]
[ATTACK_CONTACT_PERC:100]
[ATTACK_PRIORITY:SECOND]
[ATTACK_FLAG_WITH]
[ATTACK:PUNCH:BODYPART:BY_TYPE:GRASP]
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:punch:punches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:MAIN]
[ALL_ACTIVE]
[NO_DRINK]
[HOMEOTHERM:10067]
[SWIMS_INNATE][SWIM_SPEED:500]
[MUNDANE]
[CASTE:FEMALE]
[FEMALE]
[CASTE:MALE]
[MALE]
[SELECT_CASTE:ALL]
[SET_TL_GROUP:BY_CATEGORY:ALL:SCALE]
[TL_COLOR_MODIFIER:BROWN:1]
[TLCM_NOUN:scales:PLURAL]
[SET_TL_GROUP:BY_CATEGORY:EYE:EYE]
[TL_COLOR_MODIFIER:BLACK:1]
[TLCM_NOUN:eyes:PLURAL]
I can't test it, seeing as I've got a Calc class to go to, but it should work. If not, only minor modifications will be needed.
EDIT: Tested it. It works, at least in the Arena, though they're limited to spears as weapons.
EDIT 2: Changed prefstring, as per below. Why not?