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| rainbow trout (Oncorhynchus mykiss, Salmo gairdneri, Salmo irideus); steelhead (Oncorhynchus mykiss, Salmo gairdneri, Salmo irideus); steelhead trout (Oncorhynchus mykiss, Salmo gairdneri, Salmo irideus) | |||
| trota americana: 4 phrases in 2 subjects |
| Fish farming pisciculture | 2 |
| Ichthyology | 2 |