Reproduction in the live-bearing teleost Clinus Superciliosus

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Abstract
By studying embryonic mass increase, yolk availability and embryonic oxygen consumption, it was established that the embryos of C. superciliosus rely almost entirely on maternal secretions for their nutrients and the species therefore displays an advanced form of viviparity. They breed throughout the year and the species also exhibits superembryonation (superfoetation -sic) with as many as 12 broods developing simultaneously. Furthermore, it was found that the relationships between the body mass and the gonad masses and number of embryos produced, are linear. It was suggested that these phenomena, coupled to the territoriality exhibited by the species, are factors whereby the species overcomes the problem of a reduction in the number of embryos produced, a phenomenon normally encountered in viviparous fishes. By die bestudering van embrioniese massa-toename, dooier- beskikbaarheid en embrioniese suurstofverbruik, is vasgestel dat die embrios van C. superciliosus feitlik heeltemal staatmaak op moederlike sekresies vir hulle voedsel en daarom toon die spesies 'n gevorderde vorm van vivipariteit. Hulle broei dwarsdeur die jaar en die spesies toon ook super- embrionasie (super-fetasie - sic) met soveel as 12 broeisels wat gelyktydig ontwikkel. Verder is ook gevind dat die verhoudings tussen die liggaamsmassa en die teelkliermassas en die aantal embrios geproduseer, linieer is. Dit is voorgestel dat hierdie verskynsel, gekoppel aan die territorialiteit getoon deur hierdie spesies, faktore is waarby die spesies die probleem van 'n verlaging in die aantal embrios geproduseer oorbrug - 'n verskynsel wat normaalweg aangetref word by viviparige visse.

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