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Showing 1 to 20 of 50 for “"Age and Growth"”.
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Age and Growth of the Ozark Hellbender
Length-specific growth rates of Ozark hellbenders, Cryptobranchus alleganiensis bishopi, from the North Fork of the White River, Missouri, were calculated by regression from growth of marked and recaptured hellbenders. Growth rates declined steadily after transformation, going from about 74 mm …
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Firm Size, Age and Growth in South Africa
The relationship between a firm’s size, age and proportional growth rate is examined using multiple samples of South African firm-level data from the early to mid-2000s. The foundation of this study is Gibrat’s Law of Proportionate Effect (Gibrat, 1931), which states that a firm’s proportional …
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VALIDATION OF AGE AND GROWTH USING MICROCONSTITUENT ANALYSIS OF FISH HARDPARTS
Without accurate age interpretation or validation, serious errors in the management and understanding of fish populations can occur. This study employs a novel approach to age validation using trace element microconstituent analysis of hardparts. The optical zones of annuli are hypothesized to be …
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Age and Growth Determination of the Black Bullhead From Soft Fin Rays
Introduction: Knowledge of the age of individuals comprising populations of fish is essential to the fishery biologist. From such information he is able to calculate the rate of growth, determine the age at which sexual maturity is attained and the longevity of the species. These calculations and …
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The diet, reproductive biology age and growth of yellowtail, Seriola lalandi, in South Africa
Yellowtail, Seriola lalandi, is an important line-caught fish in South African waters, yet little information is available on their life-history. This study aims to add information on the diet and feeding habits, reproductive biology and the age and growth of yellowtail in South Africa. The diet of …
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Distribution, Age, and Growth, and Feeding Ecology of Paddlefish (Polyodon spathula) In Unaltered Missouri River, South Dakota
… sacrificed during the analysis of food habits, and 301 fish were tagged and released. Paddlefish were located by observation, gill netting, and snagging. Paddlefish were primarily found downstream from submerged sandbars from late spring to early fall. The crests of the sandbars were 0.1 to 1.0 …
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In Support of a Rationally Managed Fishery: Age and Growth in Patagonian Toothfish (<i>Dissostichus eleginoides</i>)
… occur on the continental shelves and shelf breaks of southern South America and the Southern Ocean. Stock structure, critical to good fisheries management, can be inferred from growth differences between areas, but available growth data are compromised by inconsistencies in age …
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Influence of site, clone, age, and growth rate on wood properties of three Populus X Euramericana clones
… variation in selected anatomical, physical and mechanical properties of three Populus x euramericana (Dode) Guinier hybrid clones grown on two dissimilar sites in Hungary. Six 15 years old trees from three clones on one site and six 10 years old trees from two clones on the other site were …
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A Comparison of the Age and Growth of Yellow Perch, Perca flavescens (Mitchill) in Lake Audubon and Lake Sakakawea, North Dakota, 1978
<p>The age and growth of yellow perch, Perca flavescens (Mitchill), were compared in two lakes which are part of a large Missouri River mainstem reservoir. Forty-five and one hundred and two perch were captured from Lake Sakakawea and Lake Audubon, respectively, by using experimental gill nets and …
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Comparative age and growth of juvenile dusky kob (Argyrosomus japonicus) in three South African estuaries, with notes on diet and temperature effects
… Argyrosomus japonicus is an important commercial and recreational linefish species in South Africa. It has a wide distribution range from Cape Agulhas to the Mozambique border. Juveniles A. japonicus <1070 mm) occur inshore and in estuaries where surf-zone and estuarine anglers target them. Adult …
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The Comparative Effects of a Thermal Gradient on the Age and Growth Characteristics of Largemouth Bass (Micropterus Nigricans), and Atlantic Cod (Gadus Morhua)
… due to variations in ecological niches and physiological adaptations. I assessed the effects of temperature on Largemouth Bass (Micropterus nigricans) and Atlantic Cod (Gadus morhua) using data from peer-reviewed journals, state records, and fisheries agencies. For Largemouth Bass, I …
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Analyses of Indices of Abundance for Important Groundfish Species in the Northern Gulf of Mexico from 1987-2009, Relative to Shrimp Bycatch; with Age and Growth of Three Sciaenid Species
… intended target species of commercial shrimp, and most of the additional bycatch is returned to the sea dead or dying, inducing higher rates of mortality. This study was developed to assess the potential ecosystem effects of shrimp harvest on thirty selected species/species groups commonly …
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Population Dynamics of Sheepshead (<i>Archosargus probatocephalus;</i> Walbaum 1792) in the Chesapeake Bay Region: A comparison to Other Areas and an Assessment of Their Current Status
… This increase in fishing pressure has led to demands to install effective management measures to protect the fishery. However, no study regarding the population dynamics, and thus potential yield, of sheepshead has been conducted north of Cape Hatteras. We addressed the need for information …
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Life history of the endangered fine-rayed pigtoe pearly mussel, Fusconaia cuneolus (Lea, 1840), in the Clinch River, Virginia
The periods of gravidity and glochidial release, required fish hosts, and age and growth characteristics of Fusconaia cuneolus were studied in the upper Clinch River, Virginia during 1986 and 1987. This summer brooder is gravid from mid-May through late July, releasing most glochidia in midJune. …
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Effects of landlocked alewife introduction on white bass and walleye populations, Claytor Lake, Virginia
The effects of the landlocked alewife introduction on the white bass and walleye populations were evaluated. Only white bass in age classes III and IV clearly exhibited an increase in total length following the introduction of landlocked alewives. Age and growth analysis for walleye, white bass, …
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Fish scales as ecological indicators: empirical approaches to improve their practical application to fish ecology
… fish communities are sampled within research and monitoring programmes in freshwater fisheries. Although used primarily to age individual fish, there is increasing evidence of their potential for application to other ecological methods, yet there is also considerable uncertainty in how this …
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A comparison of growth rates of coarse fish in gravel-pit lakes in south-east England and of population structure in selected lakes
Age and growth rates of the coarse fish of 39 gravel-pit lakes in South-East England are compared. Species composition and growth rate are very variable, the commonest species being roach (Rutilus rutilus L.), bream (Abramis brama L.), tench (Tinca tinca L.), perch (Perca fluviatilis L.) and pike …
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ΕΡΕΥΝΑ ΠΟΙΟΤΙΚΩΝ ΧΑΡΑΚΤΗΡΙΣΤΙΚΩΝ ΤΟΥ ΞΥΛΟΥ ΕΞΙ ΝΕΩΝ ΚΛΩΝΩΝ ΛΕΥΚΗΣ ΣΕ ΣΧΕΣΗ ΜΕ ΤΟ ΓΕΝΟΤΥΠΟ, ΤΗΝ ΗΛΙΚΙΑ ΚΑΙ ΤΗΝ ΤΑΧΥΤΗΤΑ ΑΥΞΗΣΕΩΣ ΤΩΝ
… ("X/3", "X/10", "X/34", "A/87", "Z/32", "Z/17") AND OF THE CLONE "I-262", GROWN UNDERVARIOUS SPACINGS (NELDER'S DESIGN), WERE SAMPLED INTERNODALLY TO EXAMINE PATTERNS OF VARIATION OF SOME WOOD QUALITY CHARACTERISTICS I.E. RING WIDTH, WOOD DENSITY AND FIBER DIMENSIONS AND TO DETERMINE THE …
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