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pangasiid catfish , with seasonal migrations tied to the annual flooding cycle , are extremely vulnerable to hydro impoundments , which block their migratory routes . Opportunity Grants are competitive grants that can provide additional funding to augment or expand oil collection and informational programs established by Used Oil Block Grants . To ensure no access is allowed outside of the controlled SecurID authentication system , all production machines are located behind firewalls which block all traffic attempting to reach any port or service that has not been audited and confirmed as 100 % secure . It was originally thought that allergen extracts worked by raising blocking antibodies . Steroids block the allergic response . And Senior Allison North finished with 12 kills and 7 blocks .