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| North American freshwater catfishes (Ictaluridae); channel cats (Ictaluridae) | |||
| catfishes (Ictaluridae) | |||
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| brown bullhead (Ameiurus nebulosus, Ictalurus nebulosus) | |||
| black bullhead (lctalurus melas); black catfish (lctalurus melas); yellow-bellied bullhead (lctalurus melas); brown bullhead (Ictalurus nebulosus); common bullhead (Ictalurus nebulosus); northern brown bullhead (Ictalurus nebulosus); common catfish | |||
| black bullhead (Ictalurus melas, Ameiurus melas); brown bullhead (Ictalurus nebulosus, Ameiurus nebulosus) | |||
| Zwergwelse: 16 phrases in 4 subjects |
| Fish farming pisciculture | 2 |
| Food industry | 10 |
| Ichthyology | 3 |
| Natural resourses and wildlife conservation | 1 |