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The movement and growth patterns of young-of-the-year black rockfish (Sebastes melanops) inhabiting two rocky intertidal areas off Northern California /Lomeli, Mark J. M. January 1900 (has links)
Thesis (M.S.)--Humboldt State University, 2009. / Includes bibliographical references (leaves 70-75). Also available via Humboldt Digital Scholar.
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Quality changes of aquacultured hybrid striped bass fillet meat resulting from reduction of post-harvest metabolism /Eifert, Joseph Daniel., January 1991 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 73-82). Also available via the Internet.
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Production of hybrid striped bass (Morone chrysops x Morone saxatilis) in a recirculating aquaculture system /Nunley, Chad E., January 1992 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 98-104). Also available via the Internet.
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Site fidelity, home range, and daily movements of white perch, Morone americana, and striped bass, Morone saxatilis, in two small tributaries of the York River, Virginia/McGrath, Patrick E., January 2005 (has links) (PDF)
Thesis (M.Sc.)--College of William and Mary. / Vita. Includes bibliographical references.
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Quality changes of aquacultured hybrid striped bass fillet meat resulting from reduction of post-harvest metabolismEifert, Joseph D. 14 August 2009 (has links)
Hybrid striped bass (Sunshine Bass) were raised in an indoor recirculating aquaculture system incorporating concrete culture tanks, sump tanks, rotating biological contactors and liquid oxygen injection and underground U-tubes for aeration. Fish were anesthetized by two methods after harvest to reduce metabolic activity. Hybrid striped bass were either held in cooled water or water with elevated CO<sub>2</sub> levels prior to sacrificing and filleting. Control fish were filleted immediately or three hours after harvest. The objectives of this study were to determine the effects of these treatments on fillet quality and to develop indicators of quality and shelf life. All fillets were stored at 1-4°C and tested over a 14-day period. Analyses included aerobic plate count, pH determination, texture measurements (Instron), color measurements (L* a* b* scale) and sensory panel evaluations of cooked portions for appearance, taste, odor and texture. Fillets of the cooled water treatment group had the highest pH and were significantly less firm (Instron). Log phase growth and the time for spoilage levels of microorganisms to grow were delayed one day in the CO<sub>2</sub> fillets. In addition, the CO<sub>2</sub> treated fillets were generally rated higher in sensory attributes than the other fillets, especially late in the test period. / Master of Science
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Habitat Use, Movements, and Exploitation of Striped Bass and Hybrid Striped Bass in Claytor Lake, VirginiaKilpatrick, John Matthews 04 May 2004 (has links)
The comparative performance of striped bass Morone saxatilis (STB) and hybrid striped bass M. saxatilis x M. chrysops (HSB) was evaluated in Claytor Lake, Virginia. This study assessed: 1) habitat use versus habitat availability for STB and HSB; 2) seasonal movement patterns, movement rates, and emigration rates of STB and HSB; and 3) angler catch rates of STB and HSB in Claytor Lake.
In general, STB and HSB used similar habitats throughout this study. However, HSB used warmer (2-3'aC) water than STB during spring of 2001 and 2002. During the summer months, fish selected the coolest water temperature available that contained adequate (> 2.0 mg/L) dissolved oxygen. Striped bass habitat was more degraded than HSB habitat during summer stratification of both years.
Both moronids exhibited similar seasonal movement patterns. Upstream spawning migrations took place in March at 9-10'aC. Summer habitat was restricted to the lower 1/3 of Claytor Lake, whereas fish used the entire reservoir during other seasons. Minimum daily movement rates were similar between species and seasons (0.2-0.5 km/h). Hourly movement rates were also similar between species (0.2-0.3 km/h). One tagged fish from the reservoir was recovered below the dam, suggesting low rates of emigration.
Poor tag return rates by anglers limited confidence in estimation of exploitation rates. However, based on estimated natural and handling mortality rates and tag-reporting rates, estimated annual fishing mortality was 26% for STB and 14% for HSB, lower than rates found in Virginia′s Lake Gaston and Smith Mountain Lake. / Master of Science
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Comparative Ecology of Juvenile Striped Bass and Juvenile Hybrid Striped Bass in Claytor Lake, VirginiaRash, Jacob Michael 31 December 2003 (has links)
Since the introduction of hybrid striped bass M. chrysops x M. saxatilis to Claytor Lake, Virginia in 1993, relative abundance of striped bass Morone saxatilis has dropped disproportionately to stocking density. Potentially deleterious interactions between the two fishes that may limit recruitment to age 1 were considered in terms of trophic relationships, physiological indices of health, overwinter survival, and post-stocking predation.
Both fishes preferred habitat types characterized by structure-free sand or gravel substrates, but striped bass and hybrid striped bass did not exhibit significant diet overlap during the growing season. At a total length of approximately 120 mm, the juvenile moronids shifted from a mixed diet of zooplankton and invertebrates to a diet comprised primarily of age-0 fishes. However, after becoming piscivorous striped bass preyed primarily upon age-0 alewife Alosa pseudoharengus, while hybrid striped bass consumed age-0 sunfishes.
Striped bass achieved mean total lengths of 229 and 173 mm by the end of the growing season in 2001 and 2002, respectively. Stocked into the reservoir three months later than striped bass, mean hybrid striped bass total lengths reached 133 mm at the end of the 2002 growing season. Condition factor, relative weight, and lipid index values were low, but nearly equivalent for both striped bass and hybrid striped bass throughout this study. Overwinter starvation of smaller (< 150 mm total length) striped bass was observed for the 2001-2002 sampling season. Predation upon stocked fingerlings was not considered significant in limiting juvenile survival; only three fingerling moronids were found in the examination of stomach contents of 200 potential predators captured near stocking sites.
It does not appear that resource competition with hybrid striped bass during the growing season resulted in increased overwinter mortality of juvenile striped bass. Delayed stocking of hybrid striped bass lessens the potential for trophic competition between striped bass and hybrid striped bass at this early life-stage. / Master of Science
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Quantitative genetics of growth, carcass-quality traits, and disease resistance in hybrid striped bass (Morone chrysops [female] x Morone saxatilis [male])Wang, Xiaoxue 15 May 2009 (has links)
A 10 x 10 factorial mating design and a ‘common-garden’ rearing approach were
employed to examine genetic effects and heritability of growth, carcass-quality traits,
and disease resistance, important production traits in the aquaculture of hybrid striped
bass (♀ white bass, Morone chrysops, crossed with ♂striped bass, Morone saxatilis).
Genotypes at four to ten nuclear-encoded microsatellites were used for parentage
assignment and a general, linear-mixed model and a Restricted Maximum Likelihood
(REML) algorithm were used to estimate variance components associated with dam, sire,
and dam x sire interaction effects.
Dam and sire effect on juvenile growth (weight, length and growth rates) were
significant, whereas dam by sire interaction effect was not. Estimates of broad-sense
heritability for growth, based on family means (h2
f), in dams ranged from 0.60 ± 0.20 to
0.82 ± 0.10 and in sires ranged from 0.43 ± 0.20 to 0.75 ± 0.18. High correlations were
found between growth rates measured at two time intervals. Estimates of general
combining ability for growth rates differed significantly among dams and among sires,
whereas estimates of specific combining ability for each dam × sire combination did not differ significantly from zero. These results suggest that additive-effect genes
contributed to the differences in juvenile growth.
Dam and sire effect on fillet weight were significant; dam effect on liver weight
and sire effect on total viscera weight were also significant. Dam and sire effect on
hepatosomatic index and viscerasomatic index were significant, as was dam and sire
interaction effect on viscerasomatic index. Phenotypic and genetics correlations between
body weight and carcass-quality traits were high (0.85 - 1.00). Phenotypic correlations
between body weight and standardized carcass-quality traits were positive but low,
ranging from 0.07 to 0.19.
Resistance to S. iniae was assessed in a challenge experiment, using the 10 dam x
10 sire factorial mating design. A significant effect of sire on resistance to S. iniae was
found, and offspring from one sire had a 2.4 times higher probability of dying than
offspring from the ‘average’ sire. Genetic effects on the immune-response parameters
and on stress-response parameters assessed were non-significant.
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Evaluation of various dietary supplements and strategies to enhance growth and disease management of hybrid striped bass Morone chrysops x M. saxatilisLi, Peng 12 April 2006 (has links)
The US hybrid striped bass (Morone chrysops x M. saxatilis) industry has been
negatively impacted by infectious diseases because there are very few approved drugs
and vaccines. Therefore, a series of experiments was conducted to explore the potential
use of various dietary supplements including autolyzed brewers yeast, the commercial
prebiotic GroBiotic®, oligonucleotides and levamisole for improvement of hybrid
striped bass growth, immunity and resistance to disease caused by various pathogenic
bacteria.
In two trials with brewers yeast, fish fed diets supplemented with yeast at 2%
generally showed enhanced weight gain and feed efficiency compared with those fed a
basal diet. Brewers yeast also positively influenced resistance to S. iniae infection. In
addition, results of immune response assays demonstrated that brewers yeast can be
administered for relatively long periods without causing immunosuppression.
GroBiotic® (Grobiotic) also resulted in significantly enhanced weight
gain, innate immune responses and resistance of juvenile hybrid striped bass to S. iniae
infection. An additional experiment with sub-adult fish showed significantly reduced
mortality of fish fed a diet supplemented with GroBiotic® at 2% when subjected to an in-situ Mycobacterium marinum challenge. This is the first report of positive effects from
dietary prebiotics for fish health management, although many fundamental questions
should be pursued further.
Dietary supplementation of a commercial oligonucleotide product (Ascogen P®)
at 0.5% of the diet was shown to enhance resistance of hybrid striped bass against S. iniae
infection and increased their neutrophil oxidative radical production. However, the effect
on growth was marginal.
Dietary levamisole supplementation at a low level (100 mg/kg) enhanced the
growth and feed efficiency of juvenile hybrid striped bass. However, an elevated dosage
(1000 mg/kg diet) strongly suppressed growth, feed intake and feed efficiency.
Hypothesized beneficial influences, including antibody production and resistance to S.
iniae and A. hydrophila were not substantiated. Although dietary levamisole increased
fish macrophage respiratory burst, an in vitro study failed to show a direct effect on
cultured macrophages.
This suite of studies demonstrated the potential use of some dietary supplements
to enhance hybrid striped bass production. Thus, immunonutrition represents a valuable
strategy to apply in aquaculture.
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Overwintering abundance and distribution of striped bass (Morone saxtilis) in the Hudson River Estuary using hydroacoustic techniquesNagy, Brian W. January 1900 (has links)
Thesis (M.S.)--West Virginia University, 2002. / Title from document title page. Document formatted into pages; contains viii, 113 p. : ill. (some col.), col. map. Vita. Includes abstract. Includes bibliographical references.
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