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Previous studies on black perch (Embiotoca jacksoni) have described multiple paternities of offspring by a given female, sperm competition, and population genetics (Reisser et al.
We used paraffin histological techniques to describe the black perch spermatocyte and intromittent organ morphology.
Black perch have an unrestricted lobular testis type (Uribe et al.
Examination of testicular micrographs of black perch [greater than or equal to] 90 mm SL had testes that contained all stages of sperm development and spermatozeugmata within the lobules (Fig.
Black perch intromittent organs are located on both sides of the anterior portion of the anal fin.
Examination of the tissue of the anal fin of black perch < 90 mm SL that had not yet developed intromittent organs revealed that tissue of the presumptive intromittent organ was present (Fig.
The morphology of black perch intromittent organs is similar to the striped (Embiotoca lateralis) and pile perches (Damalichthys vacca; Blake 1868; pers.
Our research note is the first to document the formation of black perch spermatozeugmata within the testis.
Sperm cell developmental stages of black perch (Embiotoca jacksoni).
Testicular micrographs of male black perch (Embiotoca jacksoni).
Blacksmith (Chromis punctipinnis), black perch (Ernbiotoca jacksoni) and kelp bass (Paralabrax clathratus) dominated the assemblage of conspicuous fishes.
These included blacksmith (Chromis punctipinnis; 56%), black perch (Embiotoca jacksoni; 12%), pile perch (Rhacochilus vacca; 6%), kelp bass (Paralabrax clathratus; 3.5%) and senorita (Oxyjulis californica; 3.3%).
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