Maturity and spawning of the Pacific bonito, Sarda chiliensis lineolata, in the eastern North Pacific

Black, Glenn (1978) Maturity and spawning of the Pacific bonito, Sarda chiliensis lineolata, in the eastern North Pacific. Long Beach, CA, California Department of Fish and Game, (Marine Resources Technical Report, 41)

Preview

PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader Download (1339Kb) | Preview

Abstract

A study of maturity and spawning of Pacific bonito, Sarda chiliensis lineolata, was conducted from September 1974 to August 1976. Macroscopic examination of the testes and microscopic observation of the ovaries were found to be reliable in determining the extent of sexual development of individual bonito. Spawning occurred primarily in Baja California waters, between Thetis Bank and Hutchin's Bank during the spring and summer. The study found that 100% of the males larger than 50 cm (19.7 inches) and at least 2 years old and 97.5% of the females larger than 55 cm (21.6 inches) and older than age 2 were mature. An analysis of the ova diameters in spawning fish indicates that bonito spawned more than once each season; the exact frequency could not be determined. Estimates of fecundity were unsatisfactory. (60pp.)

Actions (login required)