COLORADO: Found by pwmin:
aquatic species excerpt:
#012 POSSESSION OF AQUATIC WILDLIFE
A. Except as provided in these regulations or authorized by the Division of Wildlife or under Title
33 or Title 35 C.R.S., it shall be unlawful for any person to possess any live native or
nonnative aquatic wildlife in Colorado.
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B. No person shall, at any time, have in possession or under their control any wildlife caught,
taken or killed outside of this state which were caught, taken or killed at a time, in a manner,
for a purpose, or in any other respect which is prohibited by the laws of the state, territory or
country in which the same were caught, taken or killed; or which were shipped out of said
state, territory or country in violation of the laws thereof.
C. Except as provided herein, the possession of the following species, their hybrids or viable
gametes is prohibited:
1. Bowfins: Amiidae.
2. Carp of the following genera: Aristichthys (including but not limited to bighead carp,
Aristichthys nobilis); Catla (including but not limited to catla, Catla catla); Catlocarpio
(including but not limited to giant barb, Catlocarpio siamensis); Carrassius; Cirrhinus
(including but not limited to mrigal, Cirrhinus cirrhosis); Cyprinus; Hypophthalmichthys
(including but not limited to silver carp, Hypophthalmichthys molitrix, and largescale silver
carp, Hypophthalmichthys harmandi); Labeo (including but not limited to rohu, Labeo
rohita; Mylopharyngodon (including but not limited to black carp, Mylopharyngodon
piceus); and Tor (including but not limited to mahseers). However, grass carp,
Ctenopharyngodon idella, and common carp, including koi, Cyprinus carpio carpio, and
goldfish, Carrassius auratus, may be possessed as otherwise provided for in these
regulations.
3. Catfish, Walking: Clarias batrachus.
4. Crayfish, Rusty: Orconectes rusticus.
5. Eel, Asian Swamp: Monopterus albus.
6. Frog, Green: Rana clamitans .
7. Gars: Lepisosteidae - All species.
8. Gobies: Gobiidae.
9. Mussel, Quagga: Dreissena bugensis.
10. Mussel, Zebra: Dreissena polymorpha.
11. New Zealand mudsnail: Potamopyrgus antipodarum.
12. Perch, White: Morone americana.
13. Piranha: Including members of the genera Serrasalmus and Pygocentrus.
14. Rudd: Scardinius erythrophthalmus.
15. Ruffe, Eurasian: Gymnocephalus cernuus.
16. Snakeheads or murrels: Members of the genera Channa, Parachanna and Ophicephalus
17. Sticklebacks: Members of the genera Apeltes, Aulorhynchus, Gasterosteus and
Pungitius.
18. Tilapia: All species.
However, blue tilapia (Oreochromis aurea), Mozambique tilapia (Oreochromis
mossambica), Nile tilapia (Tilapia nilotica), and their hybrids may be imported and
possessed for fish culture and educational purposes, provided the fish and their progeny
are held in facilities screened or otherwise designed to prevent their escape and are not
otherwise released into waters of the state. Screen mesh size shall be no larger than 1/4"
diameter. For the purposes of this regulation, fish culture means the raising of fish for
sale as food or for export, by a licensed aquaculturist, and educational purposes means
the raising of fish by educational facilities or for public display in public aquaria, zoos, or
other similar facilities.
19. Trahira:Hoplias malabaricus.
20. Water Fleas, Fish Hook and Spiny: Cercopagis pengoi, Bythotrephes lomgimanus, and
Daphnia lumholtzii.
Possession of the above species may be authorized as provided by Chapter 13 of these
regulations (Possession of Wildlife, Scientific Collecting and Special Licenses) or Title 35,
Article 80, C.R.S. (Pet Animal Care and Facilities Act), or as pets in private aquaria.
However, release of any of the above species into waters of the state is prohibited.
I believe Paul has followed up on this through emails to authorities, though it was regarding gar.