Megan MurphyM.S. Student

Thesis Title

Larval crab transport in Kachemak Bay

Education

• M.S. University of Alaska Fairbanks (Oceanography)

Research Overview

The primary goal of my research is to understand the oceanographic effects on larval crab transport and distribution between inner and outer Kachemak Bay, Alaska. Closures of the Tanner (Chionoecetes bairdi) and Dungeness
(Cancer magister) crab fisheries within Kachemak Bay reflect pressing concerns regarding the sustainability of these commercially important crab species. In order to create effective management strategies, it is imperative to understand larval transport into and out of the bay.
Physical forcing, specifically tides and wind, has been shown to control distribution and behavior of larval crabs within estuarine environments; however, no study has documented both larval crab abundance and effects of transport within Kachemak Bay. It is hypothesized that general oceanographic conditions in Kachemak Bay produce a net inflow of Tanner and Dungeness larvae on the southern shore and a net outflow along the northern shore. It is additionally hypothesized that extreme tides increase abundance of crab larvae entering and
leaving the inner bay. Based on larval behavior increasing estuarine retention observed elsewhere it is also hypothesized that out-transport of megalopa will be reduced independently of tidal flow. These hypotheses will be addressed with frequent plankton sampling in relation to different tidal conditions and water transport measurements throughout the larval recruitment
period (April-October). This study will provide critical information for management of
sustainable marine resources within this highly productive and diverse estuarine ecosystem.

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