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BajaNews
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Researchers successfully cultivate tilapia in sea water
http://www.fis.com/fis/worldnews/worldnews.asp?monthyear=&am...
By Laura Fasano
March 08, 2011
A team of researchers from the state of Baja California have been able to raise tilapia, a freshwater species of high commercial value in seawater.
The research project conducted at the Center for Scientific Research and Advanced Studies of Ensenada (CICESE), showed that over a period of eight
months, the tilapia were born in freshwater and acquired an ideal size for the first harvest in seawater.
These results open new possibilities for developing aquaculture in areas where fresh water resources are very limited, as in Baja California.
"We show that here in Baja California, tilapia can be grown in sea water to prevent the use of fresh water," noted Dr. Fernando Bückle, researcher at
the Department of Aquaculture, during an interview, accompanied by Dr. Monica Hernandez, co-director of the project.
The experiments were conducted in tanks with a capacity of 30 cubic meters, with recirculation systems designed and built in the Aquaculture
Department of CICESE.
The first tank (out of a total of three) resulted in an initial number of 1,040 fish (34.6 fish x m3), which at the end of the harvest yielded 361 kg
of high quality tilapia, detailed Fernando Bückle and Monica Hernandez in a statement by CICESE.
The cultivation began with the acquisition of tilapia fry - a hybrid of Oreochromis mossambicus and Oreochromis niloticus of a red colour - which were
around an inch in length.
The fish were placed in 1,500-liter tanks containing fresh water, where they remained for a month and a half, until they reached a weight of 5 grams,
which is the recommended weight by other authors for transfer to seawater.
The researchers conducted three experiments to determine the minimum time required to achieve the transfer from freshwater to seawater. The first
experiment was conducted in 11 days, the second in 10 days and the third in 5 days.
"Fresh water is 0.5 parts per 1000 of salinity (‰) and in five days the fish adapted to 35 ‰, ie sea water. This means it is a very strong osmotic
change and which the fish resisted perfectly well. In general, during the process, the mortality was very low and allowed us to divide the fish we had
into three pools: one with 3,300 fish, another with 1,040 and the third with 2,020 specimens," said Dr. Bückle.
Already in seawater, the tilapia continued to grow by consuming a diet with 35 per cent protein until they weigh approximately 400 grams (reference of
a good size) after five months.
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DENNIS
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| Quote: | Originally posted by BajaNews
"We show that here in Baja California, tilapia can be grown in sea water to prevent the use of fresh water," |
They probably haven't looked into it, but I'll bet they could get the same results in other places. 
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Skipjack Joe
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Yes, like the Salton Sea.
I must be missing something here because if tilapia grow through their full cycle at Salton Sea what's the point of this experiment that moves them
from freshwater to saltwater.
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Dave
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It's not nice to fool with mother nature
The kudzu of trash fish. God help us if they put this species in the gulf. 
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BillP
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| Quote: | Originally posted by Skipjack Joe
Yes, like the Salton Sea.
I must be missing something here because if tilapia grow through their full cycle at Salton Sea what's the point of this experiment that moves them
from freshwater to saltwater.
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I musta missed it too, far as I know they've been thriving in the Salton Sea for decades! The Salton Sea has what, 2-3 times the salt of the ocean?
I'm with Dave, hope they don't try putting them in the SOC.
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mulegemichael
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we have, what appears to be tilapia here in the lagoon at mulege...with that in mind, they are already in the SOC..
dyslexia is never having to say you\'re yrros.
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woody with a view
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DENNIS
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I've heard that if you ever see them farmed, you'll never eat them again.
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MrBillM
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Trash-Tasting CRAP
It's a sign of how BAD fishery has become that Markets and Restaurants are actually advertising this garbage in print and on the TV.
I was working in the Auto Electric business in Indio back when the Coachella Valley County Water District decided to introduce Tilapia into the Canal
System to eat the weeds. There was a HUGE controversy with even Scientists working FOR CVCWD arguing AGAINST it, but they decided it was a Cheap way
to go.
At the time, they GUARANTEED that the fish would NEVER get past the barriers and INTO the Salton Sea.
Which, they ALMOST Immediately did. And proceeded to eat every other fish in sight.
[Edited on 3-8-2011 by MrBillM]
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tehag
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Tilapia
Introduced species rarely yield overall good results, something else in the system always has to give. Tilapia are already an introduced species which
has invaded and trashed freshwater fisheries throughout North America. Their depredations would be even worse if not for the annual die-off caused by
water temps below their tolerance in much of that range. No such control exists in most Mexican salt or fresh water. The waters, large and very small,
throughout the Sierra la Giganta in Baja Sur are now infested with them, much to the detriment of that fragile environment. The list of disastrous
introductions from place to place around the world, both deliberate and accidental, is long and generally tragic: house sparrow, European starling,
cane toad, zebra mussel, nutria, mongoose, brown tree snake, cottontail rabbit, Brazilian and Indonesian pepper trees, pampas grass, Russian thistle,
kudzu, etc., etc.
Here's a shot of an osprey tearing into a tilapia that was plucked from about 6 inches of water, 10 miles southwest of San Xavier in the Sierra la
Giganta.
Certainty is the child of ignorance, knowledge is the mother of doubt. Question everything!
http://bcsbirds.com |
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ElCap
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Tilapia are now the dominant fish species in the freshwater lagoon (presa) in San Ignacio. They likely out-compete native species for food resources,
but I don't think they are actually eating other fish - they are primarily herbivores/detritivores. I would imagine they are in most if not all
freshwater lakes & reservoirs of Baja, for better or worse.
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Woooosh
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So I've been eating freshwater ceviche and fish tacos all this time?
\"The only thing necessary for the triumph of evil is for good men to do nothing\"
1961- JFK to Canadian parliament (Edmund Burke)
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DENNIS
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I've had the frozen filets bought from WalMart and the fish is tasteless.
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Cypress
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Have eaten tilapia a number of times. Tastes fine! Will not eat any seafood imported from Asia.
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MrBillM
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IF You Say So.
One thing's certain.
I won't be looking for dining advice from Cypress.
But, having said in the past that it tastes like Crap, I have to say that Dennis is probably correct. It just doesn't have ANY taste.
Like Calimari.
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DENNIS
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A lot of these delicacies only taste as good as what you put on them.
Calamari?? Never a big fan of the stuff.
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Bajahowodd
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Problem is that with the worldwide hunger for fish, species are eradicated to supply the need. Anyone remember Orange Roughy?
I'm thinking that despite the overall lack of taste of tilapia, if the mass unwashed are willing to eat it, and it is being very easily farmed, than
more power to the rest of marine life.
http://en.wikipedia.org/wiki/Tilapia
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DENNIS
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| Quote: | Originally posted by Bajahowodd
Problem is that with the worldwide hunger for fish, species are eradicated to supply the need. Anyone remember Orange Roughy?
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Yeah....is that fish history?
And...what about Orange Julius? Now...that stuff was good. Are they extinct?
I think we went through this a while back....I think. Can't remember everything.
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Bajahowodd
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Just go to a mall in SOCAL.
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DENNIS
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| Quote: | Originally posted by Bajahowodd
Just go to a mall in SOCAL. |
What's a Mall? [been down here too long] 
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