SWFSC Publications - Lasker 1985 (Egg Production Method)

Full Report

Lasker, Reuben (ed.). 1985. An egg production method for estimating spawning biomass of pelagic fish: Application to the northern anchovy, Engraulis mordax. U.S. Department of Commerce, NOAA Technical Report NMFS-36, 99p. (errata included with PDF).
View document (PDF file, 6.9 MB)

Additional Material Available

Several high resolution images are available for the following paper:

Hunter, J. Roe, and Beverly J. Macewicz. 1985. Measurement of spawning frequency in multiple spawning fishes. Reuben Lasker (ed.), An egg production method for estimating spawning biomass of pelagic fish: Application to the northern anchovy, Engraulis mordax. U.S. Department of Commerce, NOAA Technical Report NMFS-36, pp. 79-94. (errata included with PDF).
View document (PDF file, 1.7 MB)

The images are available in both JPEG and PDF. All are black and white, no color plates were done. If you have trouble viewing the files in your web browser, try right-clicking the links and saving the files to your computer.

Figure 1 - Development of northern anchovy ovary at various magnifications.
JPEG (8.9 MB), PDF (9.4 MB)

Figure 2 - Postovulatory follicles of age 0-day; elapsed time from spawning about 0-6 h.
JPEG (5.4 MB), PDF (5.5 MB)

Figure 3 - Postovulatory follicles of age 1-day; elapsed time from spawning about 24 h.
JPEG (9.5 MB), PDF (10.0 MB)

Figure 4 - New postovulatory follicles of four species of marine fishes.
JPEG (8.6 MB), PDF (9.0 MB)

Figure 5 - Degenerating postovulatory follicles in four marine fishes.
JPEG (8.6 MB), PDF (8.9 MB)

Figure 6 - Alpha (α) stage atresia in yolked (Y) and unyolked (U) oocytes.
JPEG (6.8 MB), PDF (7.1 MB)

Figure 7 - Stages of atresia following complete yolk absorption.
JPEG (8.0 MB), PDF (8.3 MB)

Last modified: 12/24/2014