Al Jazeera sucks. They are basically the Huffington Post/Fox news of the Arab world.
One of the big problems with the article is that they cite only studies or scientist that support their purpose in the article without counterbalancing it with articles that go against what they are trying to say. Here is a prime example.
"I've seen the brown shrimp catch drop by two-thirds, and so far the white shrimp have been wiped out," Ladner told Al Jazeera. "The shrimp are immune compromised. We are finding shrimp with tumors on their heads, and are seeing this everyday."
One guy says the brown shrimp harvest is down by 2/3rds.
But here is another article
on the subject that would indicate otherwise
Seafood processors say last year's brown-shrimp season was good, but the white-shrimp catch was off. Oyster beds not hurt by floods of fresh Mississippi River water released to keep the oil offshore or to relieve record flooding last year have seen strong harvests. Some areas where the harvest was delayed in 2010 because of concerns that oil tainted the shellfish have seen weaker harvests.
The 2011 brown shrimp harvest in Louisiana was the largest since 2007, at approximately 37.7 million pounds, according to a preliminary analysis in the The Times-Picayune in New Orleans in January.
Notice that the times picayune looked at the whole harvest, not just a few people's opinion or personal analysis.
Its not that I don't believe Al Jazeera's article could be correct, or at least have some element of truth in it. But a good research article would look at both sides of an issue, not just one.
Its going to take time to determine the true impact of the gulf oil spill and all the dispersants used. We will have to see studies from a multitude of sources both government and independent.