Raper, Jamie Lee Dawn (2012) Latitudinal variation in growth rates of American lobseter (Homarus americanus) at the scale of the commercial range. Masters thesis, Memorial University of Newfoundland.
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Accurate life history information is essential for stock assessment and management of the American lobster (Homarus americanus) fishery in the Northwest Atlantic. To evaluate conservation measures adopted by lobster harvesters, a growth model is required to provide estimates of egg production and reproductive value. This study examines inconsistencies among previous estimates of growth rates and combines historical data with current tag-recapture studies to develop a general model to estimate growth rates. Growth rates calculated using multiple techniques differed substantially in a single dataset; therefore, a single technique must be used consistently in all locations. A general von Bertalanffy growth model for the entire species' range was developed and growth rates showed a steady decrease with increasing latitude within the range of 41.543600ﾟ and 50.722915ﾟ N. The decrease in growth rate per degree of latitude was approximately 0.3% for both male and female lobsters when using a regression weighted by the inverse variance. Growth parameters for American lobster can now be estimated on a site-specific basis using latitude, reducing the need for resource-intensive tag-recapture field studies.
|Item Type:||Thesis (Masters)|
|Additional Information:||Includes bibliographical references.|
|Department(s):||Science, Faculty of > Biology|
|Geographic Location:||North Atlantic Region|
|Library of Congress Subject Heading:||American lobster--North Atlantic Region--Growth; American lobster--North Atlantic Region--Geographical distribution; American lobster fisheries--North Atlantic Region|
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