Migrating to the western Indian coast during the warm months of May to July, the shark measures an average of 18 metres in length and weighs about 10-12 tonnes. The measure becomes effective today. These species, which are u nder a rebuilding plan, are among those likely to be affected by resumed scallop dredging in their habitat. North Carolina Sea Grant researchers have identified naturally occurring antibiotics in channel catfish that may be a promising indicator for monitoring fish health in the expanding aquaculture industry nationwide. From this scientists hope to develop a commercial stress test instrument.
Nonspecific immunity protects against many different diseases at once.
Specific immunity protects against only a single pathogen. They pause a few seconds in the calm pools at the top, then dart out into the lake, answering nature s imperative to reproduce. This is the largest spawning run of blueback herring since the tube was built in 1998 to help fish get past the dam, says Sid Compton, who manages a state-run fish hatchery here. It is also part of an unusually heavy blueback run through most of the state s Chesapeake Bay tributaries.