(1) Hucho is a genus of cold salmonids from large rivers and other freshwater habitats in Eurasia . They are piscivorous , and threatened by overfishing and habitat loss .
(2) Hucho is a genus of large salmonidae from cold rivers and other freshwater habitats in Eurasia , which are piscivorous and threatened by overfishing and habitat loss .

Do these two sentences mean the same thing?

Possible answers: (1). no; (2). yes;
(1).