We just published a paper testin successfully the use of photo-identification technique to identfy each individual of a population of sicklefin lemon sharks (Negaprion acutidens). This technique was found to be suitable for future behavioural studies. For a PDF copy, please send me an email at email@example.com.
Buray, N., J. Mourier, S. Planes, & E. Clua (2009). Underwater photo-identification of sicklefin lemon shark, Negaprion acutidens, at Moorea (French Polynesia). Cybium 33(1): 21-27