The lemon shark (Negaprion brevirostris) breeds around Rocas Atoll.    From Wordnik.com.  [Brazilian Atlantic Islands, Brazil] Reference

Validation trials, held within enclosures in the natural environment, on juvenile lemon sharks Negaprion brevirostris fitted with external receivers and transmitters, showed receivers logged interactions between individuals regularly when sharks were within 4 m (~4 body lengths) of each other, but rarely when at 10 m distance.    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

Michelle McComb, Timothy Tricas and Stephen Kajiura tested this hypothesis by comparing the visual fields of three hammerhead species: the bonnethead shark, (Sphyrna tiburo), scalloped hammerhead shark (Sphyrna lewini) and the winghead shark (Eusphyra blochii), with that of two normal shark species: the lemon shark (Negaprion brevirostris) and the blacknose shark.    From Wordnik.com.  [Practical Fishkeeping] Reference