Survey of Previously Outplanted Pinto (Northern) Abalone (Haliotis kamtschatkana) in the San Juan Island Archipelago, Washington State

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Survey of Previously Outplanted Pinto (Northern) Abalone (Haliotis kamtschatkana) in the San Juan Island Archipelago, Washington State

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Title: Survey of Previously Outplanted Pinto (Northern) Abalone (Haliotis kamtschatkana) in the San Juan Island Archipelago, Washington State
Author: Hester, JB; Walker, JM; Dinnel, PA; Schwarck, NT
Abstract: In 1992, the Washington Department of Fish and Wildlife (WDFW) began monitoring the pinto abalone (Haliotis kamtschatkana) populations at 10 index sites in the San Juan Island Archipelago in Northern Washington State. As of 2009, there has been an 83% decrease in the population since the beginning of the WDFW index site monitoring. It has recently been determined that this species will not likely recover without human intervention; so, in 2009, restoration efforts began by outplanting juvenile abalone to four different test sites. In March 2011, two new outplant sites were added. In July and August 2011, surveys of the six outplant sites were completed based on techniques used by WDFW to collect annual data on survival and growth rates. One site was repeatedly surveyed a total of four times at weekly intervals to compare data obtained from the repeated surveys. The Schnabel method was used to obtain a population estimate of 121 abalone out of the 350 tagged abalone known to have been outplanted in March 2011 at this site. Perimeter surveys were performed at two of the sites to determine if any abalone emigration was evident. The perimeter surveys found a total of three abalone, supporting the hypothesis that there has been little emigration from the test plots.
Description: American Academy of Underwater Sciences (http://www.aaus.org/)
URI: http://archive.rubicon-foundation.org/10131
Date: 2011

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