Early life history of three pelagic-spawning minnows Macrhybopsis spp. in the lower Missouri River

Journal of Fish Biology
By: , and 

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Abstract

Life-history characteristics of age-0 sturgeon chub Macrhybopsis gelida, shoal chub Macrhybopsis hyostoma and sicklefin chub Macrhybopsis meeki were compared using several methods. AllMacrhybopsis species consumed mostly midge pupae, but M. meeki had the most general diet (Levins' index, B = 0·22) compared with M. hyostoma (B = 0·02) and M. gelida (B = 0·09). Morisita's diet overlap index among species pairs ranged from 0·62 to 0·97 and was highest between M. hyostoma and M. gelida. Daily ages estimated from lapilli otoliths for each species ranged from 15 to 43 days for M. gelida, 19 to 44 for M. hyostoma and from 16 to 64 days for M. meeki. Mean growth rates ranged from 0·79 mm day−1 for M. meeki to 1·39 mm day−1 for M. gelida. Mortality estimates indicated high daily survivorship rates for M. meeki (0·985), but could not be estimated for the other two species. Hatch date histograms were congruent with the belief that M. hyostoma and M. gelida spawn periodically from June to September. Macrhybopsis meeki, however, appeared to respond to a specific spawning cue as hatch dates were unimodal with a peak in July. These results fill a gap in current knowledge of these imperilled species that can be used to guide management decisions.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Early life history of three pelagic-spawning minnows Macrhybopsis spp. in the lower Missouri River
Series title Journal of Fish Biology
DOI 10.1111/jfb.12892
Volume 88
Issue 4
Year Published 2016
Language English
Publisher Wiley
Contributing office(s) Coop Res Unit Atlanta
Description 15 p.
First page 1335
Last page 1349
Online Only (Y/N) N
Additional Online Files (Y/N) N