Semicystic spermatogenesis and reproductive strategy in Ophidion barbatum (Pisces, Ophidiidae)

In this paper the testicular structure and spermatogenesis of Ophidion barbatum are studied and the reproductive strategy of this species is analysed. The species has a rare type of spermatogenesis, called semicystic, in which the cyst ruptures in a stage prior to the spermatozoon stage. The most peculiar feature of the spermatozoon is its elongated shape, not typical of an oviparous species. Taking into account our results, the type of ovary and the spawning method, this species shows specialized characteristics which are fairly uncommon among oviparous species. The analysis of other biological aspects of the species, such as the capacity of the males to produce sounds, the low population density, the habit of individual members of burying themselves and the crepuscular habits, combined with our observations concerning their reproductive strategies, lead us to suggest a unique mating behaviour.