Bonefish numbers down in US census

An annual bonefish census conducted in the Florida Keys in the US last October has indicated a drop in numbers of the prized sportfish.

The count, conducted by more than 60 guides and anglers, was down by 25 per cent from an 8-year mean estimate of 316,805 bonefish to a new low of about 240,000 bonefish, according to Professor Jerry Ault, a fisheries scientist with the University of Miami’s Rosenstiel School of Marine & Atmospheric Science.

“Since 2003 we have conducted an annual bonefish census throughout the Keys,” said Ault.

“It provides researchers, like me, and fisheries managers with an early warning system to identify trends and population changes. This year guides saw even fewer bonefish in historically productive areas, a possible reflection of real population changes coupled with differences in the coastal environment. Future counts will be looking for evidence of this as an emerging population trend.”

Ault says Bonefish are a good indicator of overall ecological health.

“These highly mobile fish feed on small marine organisms at the base of the food chain like shrimps, crabs and baitfish; thus, the health of the bonefish population is greatly dependent on the status of the ecosystem as a whole. A change in the population is likely to signal greater issues throughout the coastal ecosystem and provide clues that we can study and address before the situation becomes critical,” he said.

Ault suggests that if bonefish abundance did decline in 2010, it is still too early to pinpoint the reasons. However, he points out that last winter’s January extended cold wave was particularly lethal to tropical gamefish species including tarpon, snook and bonefish, and to their prey. Water temperatures dipped as low as 44 degrees Farenheit for periods of more than 3.5 days, and killed mostly small (and young) bonefish in Biscayne and Florida Bays.

Bonefish are a major component of Florida’s $5.5 billion sportfishing industry. Based on past results, Ault estimates each bonefish in Florida is worth about $3,500 per year to the industry or about $75,000 over its lifetime.

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