† Clerkin, P.J.1*, Ebert, D.A.1, Naylor, G.J.P.2
REPRODUCTIVE BIOLOGY AND MATURITY OF DEEP-SEA SHARKS IN THE SOUTHERN INDIAN OCEAN
1 – Moss Landing Marine Laboratories, 2 – College of Charleston, Oral Presentation, 2013 WSN Meeting, Student Symposium, Oxnard, Calif., Nov 7-10, 2013.
Abstract: Examination of bycatch from Southern Indian Ocean seamounts: 1) surveyed chondrichthyan fauna, 2) assessed life history characteristics of regional elasmobranch, and 3) contributed to DNA-based chondrichthyan phylogeny as part of the Tree of Life project. Reproductive and maturity data including sex, length, maturity stage, oviducal gland development, egg width, and egg numbers were recorded and analyzed from 2,400 chondrichthyans collected during a 2-month deployment aboard a trawler southeast of Madagascar. Approximately 400 specimens of the genera Centrophorus, Deania, Centroscymnus, Centroselachus, Proscymnodon, Zameus, Etmopterus, Dalatias, Apristurus, Parmaturus, Pseudotriakis, Hydrolagus, and Chimaera were collected from 500 m–1,500 m depths. Over 700 tissue samples for DNA studies and 225 vertebrae and spines for age/growth studies were collected. Qualitative diet data was recorded from sharks including poorly known species, e.g., Proscymnodon plunketi and Pseudotriakis microdon, and several undescribed species of Etmopterus, Apristurus, Parmaturus, Hydrolagus, and Chimaera. Project specimens were deposited at the American Museum of Natural History, the California Academy of Sciences, and the Smithsonian Institution. The expedition was an international collaboration between Moss Landing Marine Laboratories, College of Charleston, Southern Indian Ocean Deepsea Fishers Association, Sealord Corporation, Mauritius Ministry of Fisheries, and was funded, in part, by NSF grant: DEB-01132229.