. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE CYCLE OF PSOLUS 1-'ABR1CI1 135. Figure 9. Psolus fabricii. Light micrographs of testicular sections illustrating the spermatogenic cycle. (A) Post-spawning testis showing the germinal epithelium (GE) and channels where sperm passed during spawning (C); (B) Growth stage showing the highly convoluted germinal epithelium (GE) and the proliferation zone (PZ); (C) Growth stage showing the germinal epithelium, spermatogonia (SG), spermatocytes (SC) spermatids (ST) and spermatozoa (SP) in successive layers progressing
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE CYCLE OF PSOLUS 1-'ABR1CI1 135. Figure 9. Psolus fabricii. Light micrographs of testicular sections illustrating the spermatogenic cycle. (A) Post-spawning testis showing the germinal epithelium (GE) and channels where sperm passed during spawning (C); (B) Growth stage showing the highly convoluted germinal epithelium (GE) and the proliferation zone (PZ); (C) Growth stage showing the germinal epithelium, spermatogonia (SG), spermatocytes (SC) spermatids (ST) and spermatozoa (SP) in successive layers progressing towards the lumen; (D) Early advanced- growth stage showing the proliferating zone (PZ) and spermatozoa (SP): (E) Late advanced-growth stage showing the thin gonadal tubule wall and an abundance of spermatozoa (SP); (F) Mature stage showing the thin tubule wall (TW), absence of the proliferation zone, and great numbers of spermatozoa (SP) in the lumen. The bar in photograph A represents 800 ^m and applies to photographs B, D, E and F. whereas the bar in photograph C represents 300 urn. slightly. Subsequently, the thickness of the tubule wall progressively increased, although the pattern varied de- pending on tubule size. Thus, the large tubules grew more rapidly and attained a peak («=120 ^irn) in November 1988, whereas the small tubules did not attain a peak (=140 nm) until February 1989. Subsequently, the size of the modal size class again decreased to 20-40 /um fol- lowing the 1989 spawning (Fig. 10). Environmental factors Temperature. The mid May to mid June spawning, in 1988, coincided with the spring warming period, and temperatures attained about 5°C at the time of spawning (Fig. 11). However, temperatures fluctuated markedly during this period. An increase from 4 to 6°C was ob- served between 20 and 23 May 1988, and a drop of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration an
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
