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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Hierarchical models of fishing behavior by factory trawlers in midwater-trawl fishery for Pacific hake (Merluccius productus) /

Dorn, Martin William, January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [160]-165).
12

Impacts of otter trawling on infaunal bivalves living in sandy bottom habitats on the Grand Banks /

Gilkinson, Kent Dennis, January 1999 (has links)
Thesis (Ph.D.)--Memorial University of Newfoundland, 1999. / Restricted until June 2000. Includes bibliographical references.
13

Effect of environmental conditions on the natural activity rhythms and bottom trawl catchability of Atlantic cod (Gadus morhua) /

Winger, Paul D., January 2004 (has links)
Thesis (Ph.D.)--Memorial University of Newfoundland, 2004. / Includes bibliographical references.
14

An analysis of the trawl and longline fisheries for Merluccius capensis off the west coast of South Africa

Fairweather, Tracey Pamela. January 2001 (has links)
Thesis (M.S.)--Rhodes University, 2001. / Title from PDF t.p. (viewed on Apr. 23, 2006). Includes bibliographical references (leaves 100-110).
15

Detection of trawling noise by Atlantic cod (Gadus morhua L.).

Buerkle, U. January 1973 (has links)
No description available.
16

Fishing location choices in Oregon trawl fisheries : are fishermen risk-averse or risk-prone?

Trisak, Jiraporn 22 November 1994 (has links)
Despite the fact that fishing is an inherently uncertain business, risk has rarely been formally recognized in fisheries science or management. Few fishery management plans include any form of risk assessment and those that do focus on minimizing risk caused by uncertainty associated with markets and environmental conditions. Fishermen's attitudes towards risk, whether they are risk-neutral, risk-averse, or risk-prone, have rarely been considered. Although fishermen's attitudes towards risk have been shown in theory to have an impact on fish populations, none of the previous investigations precisely identified whether fishermen are risk-neutral, risk-averse, or risk-prone. This research attempted to identify fishermen's attitudes towards risk from an analysis of their decisions about where to fish. The research applied risk-sensitive foraging theory to an analysis of data from the Oregon trawl fishery for 1991. The data were provided by the Oregon Department of Fisheries and Wildlife. One file contained tow-by-tow information for each fishing trip on landings by species, time spent fishing, type of gear, and fishing locations. A corresponding file contained trip-by-trip information on landings and price by species. The two data files were screened for inconsistencies and then classified into small homogeneous categories based on port, fishing gear, fishing area, and boat size. Various variance-discounting models were fitted to each category to determine fishermen's attitudes toward risk. The models describe the expected utility of fishing at a given distance from port as a linear function of the mean, variance, and third moment of the dollar value per hour of the retained catch. The unknown parameters were estimated from the data using logistic regression techniques. The results of the analysis indicated that in two of fifteen categories the fishermen were risk-averse, and in four categories they were risk-neutral. However, for the remaining nine categories the results were inconclusive and in some cases the fishermen's choice of fishing locations appeared illogical. Instead of preferring fishing grounds that generated higher profits, it appeared that fishermen actively avoided such grounds. The inconclusive and sometimes illogical results may have been due to inappropriate assumptions about the data and about the factors motivating fishermen's decisions. Additionally, there might have been some factors that could have affected the analysis which this research overlooked. For example, this research only accounted for monetary rewards, but fishermen may have preferences other than revenues and costs that influence their choice of fishing grounds. / Graduation date: 1995
17

The impact of mobile fishing gear on benthic habitat and the implications for fisheries management /

McCallum, Barry R., January 2001 (has links)
Thesis (M.M.S.)--Memorial University of Newfoundland, 2001. / Bibliography: leaves 75-82.
18

Probabilistic model designs and selection curves of trawl gears /

Sun, Limei, January 2001 (has links)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2001. / Restricted until October 2004. Bibliography: leaves 99-101.
19

Dynamic programming models of fishermen's choice of target species assemblage in the U.S. west coast groundfish trawl fishery /

Babcock, Elizabeth A. January 1998 (has links)
Thesis (Ph. D.)--University of Washington, 1998. / Vita. Includes bibliographical references (leaves [120]-129).
20

Swimming endurance of American plaice (Hippoglossoides platessoides) and Atlantic cod (Gadus morhua) : implications for catchability by otter trawls /

Winger, Paul D., January 1998 (has links)
Thesis (M. Sc.), Memorial University of Newfoundland, 1998. / Bibliography: leaves p. 71-84.

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