Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Experts of the University of Cádiz control the change of sex in gilthead breams with microchips

07.05.2007
Experts of the Plant of Marine Cultures, located at the Andalusian centre for marine studies (Centro Andaluz Superior de Estudios Marinos CASEM), -part of the University of Cádiz (UCA)- are working on a project consisting of the exhaust monitoring of gilthead breams in captivity with the aim of controlling and analysing step by step their growth and reproductive response, as well as their growth rate.

With this study, experts of the lab observe these changes first hand thanks to a microchip. ‘We implant it in the dorsal muscle of the specimens we are analysing, which is like their id card, as gilthead breams have a peculiarity- they change sex as they grow. The change of sex from male to female can happen once they reach one and a half kilos of weight. With this system it is easy to know what fish we are checking. Once each specimen is identified, we weight and measure it in order to follow their development, as mature fish get very fat due to their gonads, but do not get very long during the laying period’, director of Plant of Marine Cultures Rosa Vázquez said.

In order to guarantee the well-being of the different species in this animal experimentation lab, fish are kept in such conditions so as to avoid stress. ‘These factors include the diminishing of the light intensity. In the specific case of breeding plants of gilthead breams, the fish of the facilities are kept in tanks of sea water with a light control system. Also, they are subject to a controlled photoperiod of 8 hours of daylight’, the lab’s head technician said.

In addition to following-up the changes of fish in captivity, the obtaining of eggs and larvae allows to carry out trials and larva culture practical in the lab.

A decade of research in Aquaculture

Apart from coordinating and managing the teaching and research activities of the University of Cadiz in the field of Aquaculture, the Plant of Marine Cultures breeds, supplies and experiments with marine species. Its function as a university lab does not exempt it from being a place where research projects are carried out.

Coordinated by Dr. María del Carmen Rendón, of the Department of Biology, and led by Rosa Vázquez (head technician since 1996), the team of experts is made up by Ana Álvarez Macías, Carmen María Álvarez Torres, Mariano García de Lara and Rosario Sánchez Maestre. However, the lab is also a place for training the future professionals of the aquaculture sector. This is why there are also two university scholarship holders, trainees at a company, and students doing practical work on aquaculture operations at the vocational training centre ‘Santi Petri’ of San Fernando, who are learning the latest techniques and novelties in this sector.

The team develops techniques for fish and mollusc breeding, larvae cultures of fish and molluscs, and phytoplankton and zooplankton cultures. ‘We produce biological material related to marine cultures, such as zooplankton (rotifers and artemiae), phytoplankton, with a camera of microalgae culture, as well as eggs and larvae. All these cultures are useful for teaching and research at the Faculty of Sea and Environmental Sciences’, Rosa Vázquez said.

Ismael Gaona | alfa
Further information:
http://www.andaluciainvestiga.com

More articles from Agricultural and Forestry Science:

nachricht Plasma-zapping process could yield trans fat-free soybean oil product
02.12.2016 | Purdue University

nachricht New findings about the deformed wing virus, a major factor in honey bee colony mortality
11.11.2016 | Veterinärmedizinische Universität Wien

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Traffic jam in empty space

New success for Konstanz physicists in studying the quantum vacuum

An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...

Im Focus: How gut bacteria can make us ill

HZI researchers decipher infection mechanisms of Yersinia and immune responses of the host

Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...

Im Focus: Interfacial Superconductivity: Magnetic and superconducting order revealed simultaneously

Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.

While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...

Im Focus: Studying fundamental particles in materials

Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales

Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Sustainable Water use in Agriculture in Eastern Europe and Central Asia

19.01.2017 | Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

 
Latest News

Global threat to primates concerns us all

19.01.2017 | Ecology, The Environment and Conservation

Scientist from Kiel University coordinates Million Euros Project in Inflammation Research

19.01.2017 | Awards Funding

The Great Unknown: Risk-Taking Behavior in Adolescents

19.01.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>