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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.
161

Factors affecting timing and size of runs of hilsa shad (Hilsa ilisha) in Bangladesh and Pakistan

Das, Nitya Nanda January 1985 (has links)
Data were gathered in 1983 and 1984 on the Hilsa fishery in the Meghna River in Bangladesh, and on factors related to its seasonal variation, including effort as estimated by weekly counts of fishing boats, and landings as estimated by counts of fish offloaded at Chandpur. Historical data were also analyzed concerning factors influencing annual variations in Hilsa landings from the Padma River of the Ganges (1967-1974) and from the Indus River of Pakistan (1968-1982). Rail shipments were good indicators of landings. No significant relationship was observed between riverine Hilsa landings and fishing intensity. Rainfall, mean water level and maximum air temperature had no obvious influence on annual variations in seasonal timing of Hilsa runs in the Padma river of the Ganges. Rainfall two years earlier had a significant negative relationship with annual variation of Hilsa landings, in both the Padma River and in the Indus River. Mechanisms regulating this negative association between landings and rainfall may be that Hilsa are 1+ year old when they are first recruited to the fishery, and the survival of eggs and fry is minimum in years when there is a very high rainfall. In the Ganges and Indus rivers, annual landings were not closely correlated, and appear to be dependent in part on earlier rainfall conditions within each region. This dependency offers a means of rough forecast of annual harvest on the basis of previous rainfall data. / Science, Faculty of / Zoology, Department of / Graduate
162

Lau fish taxonomy

Tyhurst, Catherine H. January 1976 (has links)
This thesis is a preliminary attempt to consolidate materials pertaining to Lau fish taxonomy (North Malaita, Solomon Islands). Data utilized come from two sources: those collected by Maranda and Maranda (1966-1968) and those collected by the author during a two-month field period (October-December 1975). Two approaches to the analysis of terminological systems are explored first. A general description of the Lau Taxonomic Universe follows in which the major components are indicated. The focus then shifts to a more detailed discussion of Lau Fish taxonomy. Material presented here takes three forms: (1) A comprehensive list of fish identified according to biological classifications. (2) A summary of data obtained from informants' Memory Lists of fish names. The problems of taxonomic inclusion and equivalence are considered. (3) A discussion of those data traditionally regarded as "Non-Taxonomic Terminology". Distinctive Features are then considered and some examples given. Upper Level Taxa are discussed first. Following this, the Features and Criteria for the classification of Lower Level Taxa are outlined. Suggestions for further inquiry and propositions concerning analytical avenues constitute the final portion of this presentation. / Arts, Faculty of / Anthropology, Department of / Graduate
163

Home range dynamics of spotted grunter, pomadasys commersonnii, in a South African intermittently open estuary /

O'Connell, Bronwyn Anne. January 2008 (has links)
Thesis (M.Sc. (Ichthyology & Fisheries Science)) - Rhodes University, 2008.
164

A geographical framework for assessing longitudinal patterns in stream habitat and fish distribution /

Torgersen, Christian E. January 2002 (has links)
Thesis (Ph. D.)--Oregon State University, 2002. / Typescript (photocopy). Includes bibliographical references. Also available online.
165

Experimental studies on the behavioral component of reproductive cost in Daphnia pulex

Koufopanou, Vasso. January 1983 (has links)
No description available.
166

Diel Changes in the Vertical Distributions of Some Common Fish Larvae in Southern Kaneohe Bay, Oahu, Hawaii

Watson, William 12 1900 (has links)
Nine series of vertically-stratified zooplankton tows were made with a closing net at a single station in southern Kaneohe Bay, Oahu, Hawaii, between 31 August 1973 and 11 April 1974. Sampling periods occupied from 12 to 26 hours, with tows usually taken at about 3 m intervals between the surface and a maximum depth of 10 m. A total of 21,254 fish larvae of 49 kinds was collected. Six species were abundant: Foa brachygrammus, Omobranchus elongatus, Callionymus decoratus, Caranx mate, Stolephorus purpureus, and Abudefduf abdominalis. Blennius sp. and Gnathanodon speciosus were commonly taken in small numbers. These common larvae displayed five "distribution patterns: 1. F. brachygrammus and the smallest S. purpureus were most abundant near the surface at night and at depths below 4 m during the day; 2. C. mate and G. speciosus were dispersed throughout the water column at night and usually most abundant between 5 m and 6 m depth during the day; 3. Blennius sp., o. elongatus, and A. abdominalis were dispersed throughout the water column at night and concentrated near the surface during the day; 4. the larger ~. purpureus maintained a level of maximum abundance below 6 m day and night; 5. C. decoratus was taken at all depths at all times. Patterns 1, 2, and 3 are shown to be light-related. Pattern 4 is shown to be partially attributable to avoidance of the towed net by S. purpureus larvae larger than about 6mm, and a feeding-related migration is proposed to account for pattern 5. The observed patterns are analogous to those shown for fish larvae in the open ocean on scales of from 50 m to 200 m. It is proposed that Kaneohe Bay represents a vertically compressed ocean with respect to the vertical distribution of fish larvae. / Typescript. Bibliography: leaves 130-134.
167

Presence of fish in irrigation diversions from the Verde River and Wet Beaver Creek, Arizona

Roy, Richard Roger, January 1989 (has links)
Thesis (M.S. - Renewable Natural Resources)--University of Arizona, 1989. / Includes bibliographical references.
168

Age, growth and yield-per-recruit analysis of ndunduma Diplotaxodon limnothrissa (Teleostei: Cichlidae), in the southeastern arm of Lake Malawi /

Kanyerere, Geoffrey Zantute. January 2003 (has links)
Thesis (M. Sc. (Ichthyology & Fisheries Science))--Rhodes University, 2004.
169

Testing the ArcGIS Marine Data Model : using spatial information to examine habitat utilization patterns of reef fish along the west coast of Hawaii /

Aaby, Alyssa Anne. January 2004 (has links)
Thesis (M.S.)--Oregon State University, 2005. / Printout. Includes bibliographical references (leaves 51-53). Also available online.
170

Diet-induced phenotypic plasticity of feeding morphology in the genus Lepomis

Hegrenes, Scott Grayson. Juliano, Steven A. January 1999 (has links)
Thesis (Ph. D.)--Illinois State University, 1999. / Title from title page screen, viewed July 24, 2006. Dissertation Committee: Steven A. Juliano (chair), Wayne A. Riddle, Scott K. Sakaluk, Charles F. Thompson, Douglas W. Whitman. Includes bibliographical references (leaves 126-133) and abstract. Also available in print.

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