In the present review, sperm morphology, acrosome reaction, motility, short-term storage and cryopreservation are summarized and discussed in sturgeon (Chondrostei, Acipenseriformes). The elongated head of spermatozoon comprises an acrosome with 8–12 posterolateral projections. Usually three endonuclear canals are observed in the nucleus. Proximal and distal centrioles and 3–6 mitochondria are located in the midpiece region. The flagellum consists of an axoneme with a typical “9 + 2” structure of microtubules and presents a ribon-like structure due to two lateral membranous fins. Egg water, Ca2+ and Mg2+ can trigger acrosome reaction. Trypsin- and chymotrypsin-like activities are reported in sturgeon sperm. These physiological properties of sturgeon sperm are identified as serine activity with 33 kDa molecular mass and can be inhibited by their respective inhibitors. The K+ prevents sperm activation in seminal plasma, and hypo-osmolality or decrease of extracellular K+ triggers sperm activation. Extracellular Ca2+ is involved in flagellar beating pattern and sperm velocity. After activation, sperm motility, velocity, and flagellar beating frequency, wavelength and amplitude decrease, while number of waves and curvature increase. Sturgeon sperm can be stored for several days at 4 °C; however it is better to add K+ into the immobilizing medium because it prevents sperm activation during incubation. Regarding sperm cryopreservation, methanol is a better cryoprotectant than DMSO. Either short-term storage or cryopreservation of sperm generates damage to spermatozoa that lead to reduction of sperm motility performance. Some studies suggest using an activation medium containing Ca2+ for enhancing sperm motility performance of incubated or frozen-thawed sperm.
Reviews in Fish Biology and Fisheries – Springer Journals
Published: Jun 17, 2012
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
All the latest content is available, no embargo periods.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
Read and print from thousands of top scholarly journals.
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
ok to continue