Otolith microchemistry of tropical diadromous fishes: spatial and migratory dynamics

Journal of Fish Biology
Puerto Rico Department of Natural and Environmental Resources through Federal Aid in Sport Fish Restoration; North Carolina State University, North Carolina Wildlife Resources Commission; U.S. Fish and Wildlife Service; Wildlife Management Institute
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Abstract

Otolith microchemistry was applied to quantify migratory variation and the proportion of native Caribbean stream fishes that undergo full or partial marine migration. Strontium and barium water chemistry in four Puerto Rico, U.S.A., rivers was clearly related to a salinity gradient; however, variation in water barium, and thus fish otoliths, was also dependent on river basin. Strontium was the most accurate index of longitudinal migration in tropical diadromous fish otoliths. Among the four species examined, bigmouth sleeper Gobiomorus dormitor, mountain mullet Agonostomus monticola, sirajo goby Sicydium spp. and river goby Awaous banana, most individuals were fully amphidromous, but 9-12% were semi-amphidromous as recruits, having never experienced marine or estuarine conditions in early life stages and showing no evidence of marine elemental signatures in their otolith core. Populations of one species, G. dormitor, may have contained a small contingent of semi-amphidromous adults, migratory individuals that periodically occupied marine or estuarine habitats (4%); however, adult migratory elemental signatures may have been confounded with those related to diet and physiology. These findings indicate the plasticity of migratory strategies of tropical diadromous fishes, which may be more variable than simple categorization might suggest.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Otolith microchemistry of tropical diadromous fishes: spatial and migratory dynamics
Series title Journal of Fish Biology
DOI 10.1111/jfb.12317
Volume 84
Issue 4
Year Published 2014
Language English
Publisher Fisheries Society of the British Isles
Publisher location London
Contributing office(s) Coop Res Unit Atlanta
Description 16 p.
First page 913
Last page 928
Online Only (Y/N) N
Additional Online Files (Y/N) N