Then again, maybe it is just because shellfish are too expensive.

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Read More: http://www.the-lighthouse.net/kashrut-and-seafood/

There are also restrictions about keeping meat and milk in the same vessel. The fat from the meat would taint the milk and it would become unpalatable.
http://en.wikipedia.org/wiki/...
From what I've read, only creatures 'with fins and scales' were considered kosher. That left out all the shellfish, sharks, and crustaceans.
If you are keeping strict kosher, then there are some foods that are strictly forbidden.
From the text (Leviticus 11:9-12)-- “‘Of all the creatures living in the water of the seas and the streams you may eat any that have fins and scales. But all creatures in the seas or streams that do not have fins and scales—whether among all the swarming things or among all the other living creatures in the water—you are to regard as unclean. And since you are to regard them as unclean, you must not eat their meat; you must regard their carcasses as unclean. Anything living in the water that does not have fins and scales is to be regarded as unclean by you."
(Deuteronomy 14:9-10) "Of all the creatures living in the water, you may eat any that has fins and scales. But anything that does not have fins and scales you may not eat; for you it is unclean."
Those food rules, by the way, were given for a specific time period for specific reasons. In the NT Peter is recorded as being given a specific order from God to "rise, kill and eat" a variety of meat that was formerly considered "unclean" (non kosher.) This account occurred and was recorded for two reasons.
1)The immediate, literal reason: all foods are now classified as "clean." The circumstances for the giving of the food rules in the desert no longer exist, These rules have been superseded by the source (God.)
2)The figurative reason: this was a picture to illustrate that Grace was being officially opened to the Gentiles, who were formerly considered "unclean" without going through circumcision and other ceremonies to adopt themselves into Israel.
Bottom line as far as I'm concerned: Bring it (all) on.
They are also scavengers and bottom feeders and pick up, toxins, pollution and disease far easier than regular fish...which is why you hear about shellfish poisoning so often.
Kashruth ( Kosher dietary rules) also rule out predators, so sharks and octopi are also out. The basic priciple of Kashruth is that you are what you eat.
Keep in mind that another basic principle of Kashruth is that you are allowed to break any of these rules to save human life. If you were starving and all you had to eat to survive was oysters and shark, you would be allowed to eat them.
Then again, maybe it is just because shellfish are too expensive.