R
Roland Billard
Researcher at Institut national de la recherche agronomique
Publications - 164
Citations - 9253
Roland Billard is an academic researcher from Institut national de la recherche agronomique. The author has contributed to research in topics: Sperm & Carp. The author has an hindex of 53, co-authored 164 publications receiving 8927 citations.
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Book ChapterDOI
7 The Gonadal Steroids
TL;DR: This chapter discusses that the gonads potentiality to produce steroids, and the regulation of the syntheses; and the actual physiological role of gonadal steroids in fish is discussed with emphasis on gametogenesis.
Journal ArticleDOI
Some problems related to the assessment of sperm motility in freshwater fish
TL;DR: Motility requires a high dilution for initiation of synchronous motility in 100% of spermatozoa; a two-step procedure is necessary, with an initial dilution of 1 to 100 in a medium that keeps the spermatozosa immotile and allows good mixing of the viscous semen.
Journal ArticleDOI
Spermatogenesis and spermatology of some teleost fish species
TL;DR: In teleost fish, the whole of the processes involved in the formation of spermatozoa and their release and in fecundation are extremely diverse and two main types of testicular structure are distinguished : a tubular and a lobular.
Journal ArticleDOI
Biology of sperm and artificial reproduction in carp
TL;DR: The basic work on carp sperm is reviewed, the technologies of artificial insemination are described and the sperm is of a primitive type with uncondensed chromatin and a small midpiece and motility depends mainly on endogenous ATP stores.
Journal ArticleDOI
Cryopreservation of sperm in marine fish
TL;DR: The quality of frozen-thawed semen was evaluated using previously standardized biotests, such as a two-step motility activation technique adapted for the different species and fertilization assays using a discriminating insemination technique.