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The testes of fish are paired organs, of a variable shape in different  species of fish. Their structure in the salmonid species is lobular. With the  histological assays, we established that the lobes were separated by the  connective tissue septa, which, given the intensity of spermatogenesis in the  studied groups of fish (Salmo trutta m. Fario; Oncorhynchus mykiss)  sporadically disappear, in fact, they break. In the space between the lobes  there are also cross-sections of blood vessels with visible erythrocytes.  During the spermatogenesis, in the interstitium there are clearly observable  interstitial endocrine (Leydig) cells that excrete steroid hormones. The  intensity of the spermatogenesis in the studied fish varies, which is  concluded on the basis of the presence of the spermatogenesis cells. In  nature, the reproductive cycle in fish is mostly based on an annual cycle,  and that is why different stages of reproduction take place at a different  temperature and during a different photoperiod. Hence, regardless of the same  time period, the spawning time in November, different types of breeding, and  finally salmon farming, point to the very important factors that influence  reproduction - diet and microclimatic conditions.

Comparative histology of testes of brown (Salmo trutta m. Fario) and California (Oncorhynchus mykiss) trout during the spawning period