- -

Sperm physiology and quality in two marine teleosts: Anguilla anguilla & Takifugu niphobles

RiuNet: Institutional repository of the Polithecnic University of Valencia

Share/Send to

Cited by

Statistics

Sperm physiology and quality in two marine teleosts: Anguilla anguilla & Takifugu niphobles

Show simple item record

Files in this item

dc.contributor.advisor Asturiano Nemesio, Juan Francisco es_ES
dc.contributor.author Gallego Albiach, Victor es_ES
dc.date.accessioned 2013-12-20T06:41:32Z
dc.date.available 2013-12-20T06:41:32Z
dc.date.created 2013-12-02T10:30:40Z es_ES
dc.date.issued 2013-12-20T06:41:28Z es_ES
dc.identifier.uri http://hdl.handle.net/10251/34625
dc.description.abstract The conservation status of the species studied in this thesis (European eel and pufferfish) is currently frail, thus the main goal of this research was to develop, improve and apply several techniques and protocols with the aim of increasing the knowledge about their sperm biology, improving their reproductive performance and even helping future breeding in captivity. The reproductive performance of the males is often assessed through the sperm motion parameters analysed by the CASA system, so first we focused on how to standardize this technique in terms of procedural and biological settings. In this respect, we laid the foundations for applying a standard method to assess sperm quality in fish, making it possible for sperm studies to be compared both intra- and inter-laboratories using the proper CASA settings. Secondly, with the aim of improving the reproductive performance of European eel males, 3 thermal regimes (two of them variable: T10 and T15; and one of them constant: T20) and 3 hormonal treatments (hCG, hCGrec and PSMG) were assessed based on different sperm quality parameters. In the case of the thermal regimes, our results demonstrated that the onset and progression of spermiation are strongly influenced by water temperature, with treatment T20 showing the best results in all the sperm quality parameters. In the case of hormonal treatments, hCGrec produced the best results in all the sperm quality parameters, becoming an economically profitable/viable treatment and an effective alternative to the standard hCG treatment often used to induce spermiation in eel species. A preliminary physiological study regarding the changes to the main ions involved in the fish sperm activation process was carried out. Our results showed that intracellular concentrations of Ca2+ and K+ increased upon eel sperm activation, while pH gradually decreased over time, thus it is likely that all of them play an important role in the initiation of sperm motility in the European eel, as with other marine and freshwater teleosts. In the second part of this thesis, which focuses on the pufferfish, an in-depth study into the sperm of this species was carried out for future application in aquacultural matters. A short-term storage method for pufferfish sperm was developed, enabling us to preserve the sperm quality parameters for a relatively long time period (7 days) compared to fresh sperm samples. Moreover, the effects of both the osmolality and the ion composition of the activation media on the sperm motion parameters were evaluated, concluding that both factors play an essential role in the initiation of sperm motility of pufferfish sperm and probably, in marine fish sperm. Finally, in vitro fertilization trials were developed to assertain how the quantity and quality of male gametes affects the fertilization and hatching rates. We demonstrated that sperm/egg ratio and sperm quality are strongly related factors, suggesting that both should be taken into account as unique interrelated elements. In addition, coefficients of correlation among all the spermatozoa motion parameters provided by a CASA system and fertilization and hatching rates were estimated for the first time in a marine species. Spermatozoa velocities showed the highest coefficients (¿0.80), suggesting that the kinetics of the spermatozoa are a key factor in the fertilization process. en_EN
dc.language Inglés es_ES
dc.publisher Universitat Politècnica de València es_ES
dc.rights Reserva de todos los derechos es_ES
dc.source Riunet es_ES
dc.subject Sperm es_ES
dc.subject Spermatozoa es_ES
dc.subject Quality es_ES
dc.subject Physiology es_ES
dc.subject Fish es_ES
dc.subject Anguilla anguilla es_ES
dc.subject Takifugu niphobles es_ES
dc.subject Eel es_ES
dc.subject Pufferfish es_ES
dc.subject CASA system es_ES
dc.subject Motility es_ES
dc.subject Reproduction es_ES
dc.subject Aquaculture es_ES
dc.subject.classification PRODUCCION ANIMAL es_ES
dc.title Sperm physiology and quality in two marine teleosts: Anguilla anguilla & Takifugu niphobles
dc.type Tesis doctoral es_ES
dc.identifier.doi 10.4995/Thesis/10251/34625 es_ES
dc.rights.accessRights Abierto es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Ciencia Animal - Departament de Ciència Animal es_ES
dc.description.bibliographicCitation Gallego Albiach, V. (2013). Sperm physiology and quality in two marine teleosts: Anguilla anguilla & Takifugu niphobles [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/34625 es_ES
dc.description.accrualMethod TESIS es_ES
dc.type.version info:eu-repo/semantics/acceptedVersion es_ES
dc.relation.tesis 8563 es_ES
dc.description.award Premiado es_ES


This item appears in the following Collection(s)

Show simple item record