Purging - Aquaponic Gardening2024-03-28T17:59:42Zhttps://aquaponicgardening.ning.com/forum/topics/purging?id=4778851%3ATopic%3A344623&feed=yes&xn_auth=noAt one point I had 300 fish i…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3477862012-06-08T23:45:33.399ZNeal Westwoodhttps://aquaponicgardening.ning.com/profile/NealWestwood
<p>At one point I had 300 fish in a 300 gallon tank, with 2 4x4 growbeds and a 4x8 floating raft. Rule #1, don't overstock a system - everything is on the edge and they had the algae flavor, Once the density got back down below 100 fish, it seemed to go away.…<cite><br></br></cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?commentId=4778851%3AComment%3A347480&xg_source=msg_com_forum#4778851Comment347719"></blockquote>
<p>At one point I had 300 fish in a 300 gallon tank, with 2 4x4 growbeds and a 4x8 floating raft. Rule #1, don't overstock a system - everything is on the edge and they had the algae flavor, Once the density got back down below 100 fish, it seemed to go away.<cite><br/></cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?commentId=4778851%3AComment%3A347480&xg_source=msg_com_forum#4778851Comment347719"><div><div class="xg_user_generated"></div>
</div>
</blockquote> I was told that fish taste li…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3475512012-06-08T16:50:01.392ZStephanie Grimhttps://aquaponicgardening.ning.com/profile/StephanieGrim
<p>I was told that fish taste like the water they come from. I purge when it is convenient, but not all the time. I don't notice a lot of difference with purged fish or non-purged ones.</p>
<p>I was told that fish taste like the water they come from. I purge when it is convenient, but not all the time. I don't notice a lot of difference with purged fish or non-purged ones.</p> Certainly can occur in RAS Sy…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3474802012-06-08T07:40:59.296ZRupertofOZhttps://aquaponicgardening.ning.com/profile/RupertofOZ
<p>Certainly can occur in RAS Syazwan.... often related to feed.... and/or feed levels...</p>
<p> </p>
<p>And anyone selling fish commercially should probably purge before sale.. indeed it's often mandated...</p>
<p> </p>
<p>But you shouldn't have any degree of algael growth in a RAS system...</p>
<p></p>
<p>And yep, we discourage any algael growth in aquaponics...</p>
<p>Certainly can occur in RAS Syazwan.... often related to feed.... and/or feed levels...</p>
<p> </p>
<p>And anyone selling fish commercially should probably purge before sale.. indeed it's often mandated...</p>
<p> </p>
<p>But you shouldn't have any degree of algael growth in a RAS system...</p>
<p></p>
<p>And yep, we discourage any algael growth in aquaponics...</p> I have a RAS aquaculture, wit…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3474752012-06-08T07:00:05.454Zsyazwanhttps://aquaponicgardening.ning.com/profile/syazwan
<p>I have a RAS aquaculture, with 6 tanks. The off-flavours does occur in RAS. and we are not even using any chemicals or etc in the water. We have to purge this fish before selling them to the market. so in my opinion, where there are nutrients in the water, will lead to algae growth hence creating the off-flavour. That's what I think<br></br> <br></br> <cite>RupertofOZ said:…</cite></p>
<p>I have a RAS aquaculture, with 6 tanks. The off-flavours does occur in RAS. and we are not even using any chemicals or etc in the water. We have to purge this fish before selling them to the market. so in my opinion, where there are nutrients in the water, will lead to algae growth hence creating the off-flavour. That's what I think<br/> <br/> <cite>RupertofOZ said:</cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?xg_source=activity&id=4778851%3ATopic%3A344623&page=2#4778851Comment347719"><div><div class="xg_user_generated"><p align="justify">"off flavours" commonly occur in pond based aquaculture... principally because it employs blue-green algael management... Or, in some countries some sort of "fertilisation"...</p>
<p align="justify"> </p>
<p align="justify">Generally. neither "causes" are found in RAS aquaculture.. or aquaponics systems...</p>
<p align="justify"></p>
<p align="justify">Catfish are highly susceptible to "off flavours"</p>
<p align="justify"></p>
<p align="justify"></p>
<blockquote><p align="justify">Two chemical compounds, Geosmin and 2-Methylisoborneol (MIB), have been identified as the cause of a majority of off-flavor incidents. Geosmin and MIB are secondary metabolic products of some species of bluegreen algae and actinomycete bacteria. MIB causes a flavor to be imparted to the flesh described as "musty" or "lagoon" and geosmin results in "earthy" or "woody" flavors. These two compounds are extremely potent. Geosmin and MIB can be tasted in the water by humans at concentrations of 0.01 and 0.03 parts per billion (ppb), respectively. In other words, if you added 1 ounce of geosmin or 3 ounces of MIB to a catfish pond that covers 600 surface acres, you would taste it.</p>
<p align="justify">A number of other less frequent off-flavors have been recognized such as moldy, astringent, rotten and sewage for which no chemical compounds have been identified. It should be noted that common farming chemicals can and do impart off-flavor in channel catfish. A good example is diesel fuel which has been recognized in a number of off-flavor cases.</p>
<p align="justify"></p>
<p align="justify"><a rel="nofollow" href="http://www.uaex.edu/aquaculture/fsa/fsa9051.htm">http://www.uaex.edu/aquaculture/fsa/fsa9051.htm</a></p>
</blockquote>
</div>
</div>
</blockquote> "off flavours" commonly occur…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3477192012-06-08T06:53:25.296ZRupertofOZhttps://aquaponicgardening.ning.com/profile/RupertofOZ
<p align="justify">"off flavours" commonly occur in pond based aquaculture... principally because it employs blue-green algael management... Or, in some countries some sort of "fertilisation"...</p>
<p align="justify"> </p>
<p align="justify">Generally. neither "causes" are found in RAS aquaculture.. or aquaponics systems...</p>
<p align="justify"></p>
<p align="justify">Catfish are highly susceptible to "off flavours"…</p>
<p align="justify"></p>
<p align="justify"></p>
<p align="justify">"off flavours" commonly occur in pond based aquaculture... principally because it employs blue-green algael management... Or, in some countries some sort of "fertilisation"...</p>
<p align="justify"> </p>
<p align="justify">Generally. neither "causes" are found in RAS aquaculture.. or aquaponics systems...</p>
<p align="justify"></p>
<p align="justify">Catfish are highly susceptible to "off flavours"</p>
<p align="justify"></p>
<p align="justify"></p>
<blockquote><p align="justify">Two chemical compounds, Geosmin and 2-Methylisoborneol (MIB), have been identified as the cause of a majority of off-flavor incidents. Geosmin and MIB are secondary metabolic products of some species of bluegreen algae and actinomycete bacteria. MIB causes a flavor to be imparted to the flesh described as "musty" or "lagoon" and geosmin results in "earthy" or "woody" flavors. These two compounds are extremely potent. Geosmin and MIB can be tasted in the water by humans at concentrations of 0.01 and 0.03 parts per billion (ppb), respectively. In other words, if you added 1 ounce of geosmin or 3 ounces of MIB to a catfish pond that covers 600 surface acres, you would taste it.</p>
<p align="justify">A number of other less frequent off-flavors have been recognized such as moldy, astringent, rotten and sewage for which no chemical compounds have been identified. It should be noted that common farming chemicals can and do impart off-flavor in channel catfish. A good example is diesel fuel which has been recognized in a number of off-flavor cases.</p>
<p align="justify"></p>
<p align="justify"><a href="http://www.uaex.edu/aquaculture/fsa/fsa9051.htm" rel="nofollow">http://www.uaex.edu/aquaculture/fsa/fsa9051.htm</a></p>
</blockquote> Interesting, I never experien…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3474742012-06-08T06:48:32.471Zsyazwanhttps://aquaponicgardening.ning.com/profile/syazwan
<p>Interesting, I never experience this one before. How many grow beds do you have? Have you try increasing the number of grow bed when you overstock your aquaponics system? <br></br> <br></br> <cite>Neal Westwood said:</cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?xg_source=activity&id=4778851%3ATopic%3A344623&page=2#4778851Comment347290"><div><div class="xg_user_generated"><p>I've found that if I overstock my aquaponic system, then I have to purge. But if I…</p>
</div>
</div>
</blockquote>
<p>Interesting, I never experience this one before. How many grow beds do you have? Have you try increasing the number of grow bed when you overstock your aquaponics system? <br/> <br/> <cite>Neal Westwood said:</cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?xg_source=activity&id=4778851%3ATopic%3A344623&page=2#4778851Comment347290"><div><div class="xg_user_generated"><p>I've found that if I overstock my aquaponic system, then I have to purge. But if I keep lower /proper densities of fish then I don't.</p>
</div>
</div>
</blockquote> I've found that if I overstoc…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3472902012-06-08T03:51:01.248ZNeal Westwoodhttps://aquaponicgardening.ning.com/profile/NealWestwood
<p>I've found that if I overstock my aquaponic system, then I have to purge. But if I keep lower /proper densities of fish then I don't.</p>
<p>I've found that if I overstock my aquaponic system, then I have to purge. But if I keep lower /proper densities of fish then I don't.</p> @TC - What method do you use…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3473872012-06-08T02:20:01.833ZPiceshttps://aquaponicgardening.ning.com/profile/WilliamBarker
<p>@TC - What method do you use to kill them quickly?</p>
<p>@TC - What method do you use to kill them quickly?</p> Yes, there is no 'off' flavor…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3473862012-06-08T02:06:12.327Zsyazwanhttps://aquaponicgardening.ning.com/profile/syazwan
<p>Yes, there is no 'off' flavors for me as well, these 'off' flavors are mostly present in my aquaculture system hence I have to purge them for a week in salt water. Just wondering why the 'off' flavors occur for aquaculture system. Might be due to the stress as well as the nutrients in the water. <br></br> <br></br> <cite>TCLynx said:</cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?xg_source=activity#4778851Comment347284"><div><div class="xg_user_generated"><p>I never…</p>
</div>
</div>
</blockquote>
<p>Yes, there is no 'off' flavors for me as well, these 'off' flavors are mostly present in my aquaculture system hence I have to purge them for a week in salt water. Just wondering why the 'off' flavors occur for aquaculture system. Might be due to the stress as well as the nutrients in the water. <br/> <br/> <cite>TCLynx said:</cite></p>
<blockquote cite="http://aquaponicscommunity.com/forum/topics/purging?xg_source=activity#4778851Comment347284"><div><div class="xg_user_generated"><p>I never noticed any "off" flavors in any of the fish we grew in aquaponics including, tilapia, channel catfish or bluegill. I think it is either just because of clean water or the fact that we net, kill, and clean the fish very quickly so they don't have time to stress out and taint their own flesh with stress chemicals.</p>
</div>
</div>
</blockquote> I never noticed any "off" fla…tag:aquaponicgardening.ning.com,2012-06-08:4778851:Comment:3472842012-06-08T01:14:22.204ZTCLynxhttps://aquaponicgardening.ning.com/profile/TCLynx
<p>I never noticed any "off" flavors in any of the fish we grew in aquaponics including, tilapia, channel catfish or bluegill. I think it is either just because of clean water or the fact that we net, kill, and clean the fish very quickly so they don't have time to stress out and taint their own flesh with stress chemicals.</p>
<p>I never noticed any "off" flavors in any of the fish we grew in aquaponics including, tilapia, channel catfish or bluegill. I think it is either just because of clean water or the fact that we net, kill, and clean the fish very quickly so they don't have time to stress out and taint their own flesh with stress chemicals.</p>