The Life History of the Yoke Darter, Etheostoma Juliae

Aspects of the life history of the yoke darter, Etheostoma juliae Meek, were studied in the James River, Missouri. A total of 652 specimens was collected from September, 1981 through September, 1982. Yoke darters attained a maximum standard length of 71 mm and had a maximum longevity of slightly over three years. Spawning began in mid-May and continued through mid-July on swift riffles. Females typically contained clutches of 70-80 mature ova which were 1.3 mm to 1.5mm in diameter. The eggs were buried in small patches of fine gravel behind large rocks and were transparent, demersal, and adhesive. Males and females spawned at one year of age provided they had attained lengths of 30mm and 32mm, respectively. Length-weight relationships were similar for both sexes but males grew at a faster rate and attained a larger size. Diet was composed of aquatic insect larvae with chironomids being the major food source. The success of this species can be attributed in part to its ability to inhabit the swiftest part of a riffle where competition with other darters is reduced.

Name thesis:degree_name

Master of Science in Biology

Level thesis:degree_level

Masters

Discipline thesis:degree_discipline

Biology

Year

1983

Author dc:creator

• James, Paul W.

Contributors dc:contributor

• Charles Taber

• Biology

Statement dc:rights

• © Paul W James

Repository record dc:identifier

https://bearworks.missouristate.edu/theses/192

OAI identifier oai:identifier

oai:bearworks.missouristate.edu:theses-1193