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علميا لملذا حرم اكل السمك الذي لا فلس له

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14 Bekeken· 24/01/07

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[0:17]now an animal like a fish which has fins and scales is

[0:22]very interesting because somewhere in its life cycle it is largely herbivorous

[0:29]even if it is in the younger or larval stages that it

[0:32]is herbivorous a fish is an amazing creature it has a very

[0:37]high ability to detoxify itself and of course being situated in water

[0:47]is eels lampreys catfish all of these don't have scales now where

[0:51]do they fit into the food chain they are largely scavengers and

[0:56]they will eat virtually everything so they fall into the category of

[1:02]biological accumulation they accumulate more toxins than the others do and therefore

[1:08]should be considered unclean sharks and rays would fall into the category

[1:15]of the unclean and they're a fascinating group of animals now they

[1:19]live in marine environments many of them and when they live in

[1:24]the marine environment they have a problem they don't have the ability

[1:29]of the fish that have fins and scales to rid themselves of

[1:33]the salts which constantly move into the body as perfectly as the

[1:38]others do so these creatures solve their osmotic water problems in a

[1:44]different fashion a bony fish will excrete salts through the gills so

[1:52]when it drinks seawater it desalinates the sea water and gets fresh

[1:56]water through this process and that is how these fishes survive in

[2:02]a marine environment a shark on the other hand also has less

[2:06]salt in its body than the sea has so you would have

[2:10]the problem that water tends to leave the animal it has a

[2:13]salt gland in the rectum whereby it can get rid of some

[2:16]of the salts but it solves its water problem by retaining urea

[2:21]and so it has very high levels of urea urea is of

[2:26]course a waste product which other animals just excrete to get rid

[2:30]of it because it is toxic but these creatures retain it and

[2:36]have developed a resilience and a resistance to this product so in

[2:40]fact they are like urea enhanced creatures so what would happen if

[2:50]you took the fins of the top of the animal and dried

[2:53]them what you would get is you would get crystallized urea and

[2:59]when you make shark fin soup that's exactly what you have it's

[3:03]like putting a urea tea bag in the soup surprises me that

[3:13]it's so expensive you

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