תחום או ענף דגים
תאריך עדכון 14/3/2012
Use of concentrated brine for raising clownfish (Amphiprion ocellaris)
Nitzan Reiss Hevlin, Dan Popper, Tal Gur, Moti Userovitch – Central and Northern Arava R&D
E-mail address for correspondence: email@example.com
The market for ornamental saltwater fish has developed greatly in recent years and the demand for fish raised in captivity has increased. Clownfish (Amphiprion) are in great demand in the European market, where they are sold as ornamental fish for reef aquariums. They are valued for their pretty form and bold color, as well as their ability to live together with invertebrates in an aquarium. In recent years at the Yair Experimental Station of the Arava R&D Authority, a protocol has been developed for breeding and raising eight species of clownfish, including the most popular species, A. ocellaris. Currently, researchers at the Arava R&D Authority are focused on improving growth and breeding, adding new species to the set of saltwater fish currently raised in the region and reducing production costs. The main cost associated with raising saltwater ornamental fish in artificial environments is the cost of the water in which the fish are kept. Seven large desalination installations are currently used in the Arava to provide drinking water for local residents. Large amounts of brine flow from each of these installations to the sewer system. This brine is a byproduct of the desalination process and contains salt concentrations that are twice that of the local pipeline water. A previous study conducted at the Yair Experimental Station in 2010 examined the growth rate and survival of young clownfish raised in brine that was supplemented with sea salt as compared with those of fish raised in desalinated water or pipeline water supplemented with sea salt. There was no difference between the health and growth rate of the fish in the different treatments.
In the experiment on which we are currently reporting, which was conducted in 2011, we evaluated the growth rate and survival of clownfish raised in brine concentrated to a salinity level of 0.25 ppt. We did not notice any difference in the growth of the fish, but there was a significant difference in terms of survival.
Histological examination of the gills of these fish did not reveal any significant pathology in any of the treatment groups. The only difference between the groups was the form and quantity of chlorine cells.
We thank the JCA Charitable Foundation for their financial support for this research. Thank you to Prof. Shanan Herpaz and Dr. Avner Canaani for their help planning the study. Thank you to Dr. Dina Zilberg, Dr. Gilat Sharon and Tamar Sini for examining the fish after the experiment. We thank the Arava staff of Mekorot, especially Yuval Plaout and Yoav Moyal for their cooperation, patience and generous assistance. We thank the staff of the Hetzva Field School for their understanding and patience.
מחבר Nitzan Reiss Hevlin, Dan Popper, Tal Gur, Moti Userovitch
תאריך יצירה 14/3/2012
תאריך עדכון 14/3/2012