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Related to male gonad: Gonadal hormones
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In conclusion, whereas the decrease in fertility in other tetraploids has been mostly associated with increases in gamete size, in the hermaphrodite tetraploid Catarina scallop, the decreased fertility in the male gonad part is unique and not directly caused by an increase in size of gametes but most probably is the result of a genetic mechanism involved in sex determination.
Out of 81 ncRNAs varied significantly between control and Zinc stressed male gonad 57 of them were down-regulated up to 4.
Photomicrographs of the macroscopic organization of the male reproductive system and histology of the male gonad and seminal vesicle.
The ratio of female to male gonad volume varied significantly between species, although the range was only five-fold.
In contrast, no significant difference emerged from analysis of male gonad serotonin concentrati ons (Fig.
In the early stage of male gonad maturation, only sperm precursors (spermatogonia, spermatocytes, spermatids) are observed.
Photomicrograph of a histological section of (A) indeterminate, (B) developing, (C) ripe, and (D) spawning stages of a male gonad in Anudara granosa.
Multifocally, the accessory sex gland and the male gonad showed inflamed septal walls and lumens filled by inflammatory exudate full of bacteria.
PCR products of the expected size of 629 bp were amplified from the female gonad and gill (run as positive control) samples; no products were detectable when DNA from the foot (negative control) and male gonad was used as template.
In the male gonad, spermatogonia, spermatocytes, spermatids, and sperm were located in series from the basal membrane of the acinus to its center (Fig.