U.S. shrimp imports may be on the increase (year-to-year they’re up 2.4 percent to more than 331 million pounds through April), but replacement costs — the cost of replacing the product at current prices — for farmed shrimp from Asia remain high.

A number of factors are contributing to the high replacement costs. For one, the U.S. dollar remains weak, especially against the Thai baht, which strengthened more than other Southeast Asian currencies in 2010. And the baht is expected to contin…