The Mexican tetra fish that lives in the rivers of Northern Mexico can heal its heart, while its cave-dwelling relative cannot A fish that can repair its heart may hold clues for future treatments ...

Now only a few thousand hitch make the annual spawning run. The fish once spawned in every tributary to Clear Lake but now are able to spawn in significant numbers in only two streams in the Big ...

Now only a few thousand hitch make the annual spawning run. The fish once spawned in every tributary to Clear Lake but now are able to spawn in significant numbers in only two streams in the Big ...