A geometric approach for estimating and predicting fecundity of Tanana River burbot
By: by Stafford M. Roach and Matthew J. Evenson.
Contributors: Evenson, Matthew J.; Alaska. Division of Sport Fish.
Series: Fishery data series -- no. 93-38.
Publisher: Alaska Dept. of Fish and Game, Division of Sport Fish
Published: 1993
Place of publication: Anchorage, Alaska
Language: eng
Number of pages: 36
Subjects: Burbot -- Alaska -- Tanana River.; Fishes -- Fertility.
Description: Fecundities of 295 burbot Lota lota collected from the Tanana River, Alaska, were estimated with a geometric approach using mean egg diameters and volumes of the ovaries. Estimated fecundities ranged from 23,937 to 3,477,699 eggs with a mean of 969,986 eggs (mean total length = 703 millimeters, range from 424 to 1,040 millimeters; mean age = 10 years, range from 5 to 18 years). A non-linear multiplicative regression model was used to describe estimated fecundity versus total length and a linear regression model was used to describe estimated fecundity versus age (years). Coefficients of determination for regressions were greater for fecundity versus length (r2 = 0.47) compared to fecundity versus age (r2 = 0.25). In both cases, the slopes were significant (P < 0.001). Predicted fecundities for fish from 450 to 1,075 millimeters ranged from 271,000 to 2,517,000 eggs. Predicted fecundities for fish from age 5 to age 18 ranged from 374,000 to 1,880,000 eggs. Linear regression models were used to describe relationships between ovary weight, ovary volume, and mean egg diameter versus both total length and age. In all cases, slopes were significantly greater than zero (mean egg diameter versus age P-value = 0.025; all other P values <0.001).
Notes: "October 1993."

Includes bibliographical references (p. 15-18).

Also issued online.