If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email firstname.lastname@example.org
Three forms of lancelets of the genus Branchiostoma (Family Branchiostomatidae) were collected on the continental shelf of western Louisiana. They were identified as larval and adult Branchiostoma longirostrum and adult Branchiostoma species. These findings represent
the first collection of pelagic adults and larvae of B. longirostrum, the first large-scale collection of pelagic adults of the genus Branchiostoma in the Western Atlantic, and the first records of sexually immature adult specimens of a Branchiostoma species which is not
unequivocally a described species. A total of 453 larval and metamorphosed (but sexually immature) adults were collected on five cruises during December 1981 to April 1982. The 24 larval specimens collected ranged from 6.2–8.0 mm TL. These larvae were “giant” in that they
exceeded 5 mm TL. Neighboring B. floridae undergo metamorphosis at about 2–5 mm TL. Collectively lancelet density peaked in January with a mean density of 4.6 specimens/100 m3. Adult specimens were collected only at night while the larvae were taken equally during night
or day. The Branchiostoma adults appeared to undergo diel vertical migration. We review literature and discuss research results on pelagic lancelets, a protracted spawning season, a prolonged larval stage, and diel vertical migration relative to various morphometric and ecological factors,
and aspects of life history.
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.