Show simple item record

dc.contributor.authorBagarinao, Teodora
dc.contributor.authorHunter, John R.
dc.date.accessioned2012-10-09T09:08:33Z
dc.date.available2012-10-09T09:08:33Z
dc.date.issued1983
dc.identifier.citationBagarinao, T., & Hunter, J. R. (1983). The visual feeding threshold and action spectrum of northern anchovy (Engraulis mordax) larvae. California Cooperative Oceanic Fisheries Investigations Reports, 24:245-254.en
dc.identifier.issn0575-3317
dc.identifier.urihttp://hdl.handle.net/10862/1131
dc.description.abstractThe visual feeding threshold and action spectrum of 10-15-mm northern anchovy larvae were determined, using as criterion the incidence of two or more rotifers in the guts of 50% of larvae tested under different spectral irradiances. The threshold sensitivity ot broadbank blue-green light is at 0.15 µWcm-2=0.61 lux. The action spectrum shows a mixumum in the green wavelengths around 530 nm: the weighted threshold irradiances at various wavelength bands converge at a mean value of 0.14 µWcm-2anch eff. The visual abilities of the anchovy allow them to feed at a depth of 74 m at noon on clear days, and at the surface during twilight and bright nights, and appear to be well adapted to the anchovy's habitat in turbid, greenish coastal waters. Comparisons with younger anchovy larvae show that changes in visual function accompany changes in eye and retinal morphology, specifically the recruitment of rods. Moreover, 10-15-mm anchovy larvae can feed to a limited extent (10%) in the dark when food densities are high (20-40 rotifers/ml). In March, which is the peak spawning season of the anchovy in southern California and Baja California, the 10-15-mm larvae have 13 hours each day to feed.en
dc.language.isoenen
dc.publisherCalifornia Cooperative Oceanic Fisheries Investigationsen
dc.titleThe visual feeding threshold and action spectrum of northern anchovy (Engraulis mordax) larvaeen
dc.typeArticleen
dc.citation.volume14
dc.citation.issue24
dc.citation.spage245
dc.citation.epage254
dc.citation.journalTitleCalifornia Cooperative Oceanic Fisheries Investigations Reportsen


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record