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 Kakao in Monokultur verträgt Trockenheit besser als Kakao in Mischsystemen
18.09.2017 | Georg-August-Universität Göttingen

nachricht Ultrasound sensors make forage harvesters more reliable
28.08.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

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: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>