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Research Publications: UM-SG-RS-2012-14
Title:
Age, growth and hatch dates of ingressing larvae and surviving juveniles of Atlantic menhaden Brevoortia tyrannus.
Year:
2012Authors:
Lozano, C; Houde, ED; Wingate, RL; Secor, DHSource:
Journal of Fish Biology 81 ( 5 ) : 1665 - 1685DOI:
10.1111/j.1095-8649.2012.03426.xAbstract:
Ages, growth and hatch dates of ingressing Brevoortia tyrannus larvae were determined in a 3 year sampling survey at the mouth of the Chesapeake Bay, U.S.A. To determine if otolith-aged cohorts had variable relative survival, hatch dates of summer-caught young-of-the-year (YOY) juveniles collected throughout the Chesapeake Bay were compared with hatch dates of ingressing larvae. Modal total length of ingressing larvae was similar among years: 28 mm in 20052006 and 20072008, and 30 mm in 20062007. Ages of ingressing larvae ranged from 9 to 96 days post hatch (dph); mean ages were similar among years, but significantly older in 20062007 (50 dph) than in 20052006 (44 dph) and 20072008 (46 dph). Larval growth rates differed among years. Earliest growth, when larvae were offshore (020 dph), was faster in 20062007 (0.62 mm day-1), than in 20052006 and 20072008 (0.55 mm day-1 in these years). Subsequently, from 30 to 80 dph, growth was slowest in 20062007. Hatch dates of ingressing larvae occurred from September to March and 90% (20072008) to 98% (20062007) had hatched prior to 31 December. In contrast, most surviving YOY juvenile B. tyrannus had hatched in January to February, suggesting selective mortality of early-hatched individuals, apparently during the overwinter, larval to juvenile transition period.
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Featured Fellow
Leone Yisrael is a cephalopod-loving scuba diver, cook, and loves to try new activities. She conducts genetic analysis and fieldwork at the Smithsonian Environmental Research Center through the Coastal Disease Ecology Lab.
Featured Research Project
Developing a habitat model for mysids, an important link in Chesapeake Bay food webs
Mysids are important mesozooplankton prey for many species of fish in Chesapeake Bay and are an important link in transferring energy from lower to upper trophic levels. Mysids also serve as biological vectors for benthic-pelagic coupling due to their diel vertical migration and omnivorous prey-switching behavior, which makes mysids important regulators of food web architecture. Despite their central role in coastal food webs, surprisingly little is known about mysid ecology and dynamics in Chesapeake Bay.
