Biology of Gadus morhua in Ogac Lake, a Landlocked Fiord on Baffin Island

Gadus morhua L. occurs in Ogac Lake, a salt, meromictic lake on Baffin Island that receives influxes of seawater only during the highest summer tides. Cod of the order of 10,000 of lengths 25 cm and greater and 500 of lengths greater than 60 cm were present. The size ranges for various ages far exceeded those of oceanic populations. Feeding conditions were poor, and sea urchins predominated in the diet. Large cod (greater than 50 cm) were highly cannibalistic, and it was estimated that they consume of the order of 3500 fish of 20–40 cm annually. Maturation occurred at the unusually large size of 85 cm in females, and at about 65 cm in males. Apparently many of the cod never reach these sizes. Spawning was from late May to early July in 1962, and initiation of spawning appeared to be related to light. The hatching of cod larvae coincided with the appearance of the nauplii of the dominant copepod in the lake. Egg size was highly variable and exhibited a curious bimodalism. Variation in vertebral and fin-ray counts was slight in spite of high environmental variability, and thus appears largely genetically controlled. Possibly the first inhabitants came from Greenland stocks, which have high growth rates similar to the faster growing cod in the lake, and similar high length at maturity. Meristic characters also suggest affinity with Greenland rather than Labrador cod. The hydrography of the area and the possibilities of larval drift or adult migration into the lake are discussed. Cannibalism must exert continuing selection for high growth rates, but very poor feeding conditions and hierarchial dominance effects probably prevent general attainment of high growth rates.

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Growth rates are related to production efficiencies in juveniles of the sea urchin Lytechinus variegatus

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315412001907 ◽

2013 ◽

Vol 93 (6) ◽

pp. 1673-1683 ◽

Cited By ~ 7

Author(s):

L.E. Heflin ◽

V.K. Gibbs ◽

W.T. Jones ◽

R. Makowsky ◽

A.L. Lawrence ◽

...

Keyword(s):

Growth Rate ◽

Growth Rates ◽

Production Efficiency ◽

Sea Urchins ◽

High Growth ◽

Dietary Treatment ◽

Lytechinus Variegatus ◽

Wet Weight ◽

Dietary Treatments ◽

Production Efficiencies

Growth rates of newly-metamorphosed urchins from a single spawning event (three males and three females) were highly variable, despite being held en masse under identical environmental and nutritional conditions. As individuals reached ~5 mm diameter (0.07–0.10 g wet weight), they were placed in growth trials (23 dietary treatments containing various nutrient profiles). Elapsed time from the first individual entering the growth trials to the last individual entering was 121 days (N = 170 individuals). During the five-week growth trials, urchins were held individually and proffered a limiting ration to evaluate growth rate and production efficiency. Growth rates among individuals within each dietary treatment remained highly variable. Across all dietary treatments, individuals with an initially high growth rate (entering the study first) continued to grow at a faster rate than those with an initially low growth rate (entering the study at a later date), regardless of feed intake. Wet weight gain (ranging from 0.13–3.19 g, P <0.0001, R2 = 0.5801) and dry matter production efficiency (ranging from 25.2–180.5%, P = 0.0003, R2 = 0.6162) were negatively correlated with stocking date, regardless of dietary treatment. Although canalization of growth rate during en masse early post-metamorphic growth is possible, we hypothesize that intrinsic differences in growth rates are, in part, the result of differences (possibly genetic) in production efficiencies of individual Lytechinus variegatus. That is, some sea urchins are more efficient in converting feed to biomass. We further hypothesize that this variation may have evolved as an adaptive response to selective pressure related to food availability.

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GROWTH OF PIKE-PERCH SANDER LUCIOPERCA (L., 1758) (PERCIDAE) IN RESERVOIRS OF K. SATPAYEV’S CHANNEL

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2018-1-59-68 ◽

2018 ◽

pp. 59-68

Author(s):

Saule Zhangirovna Asylbekova ◽

Kuanysh Baibulatovich Isbekov ◽

Vladimir Nickolaevich Krainyuk

Keyword(s):

Growth Rates ◽

Growth Dynamics ◽

High Growth ◽

Water Bodies ◽

Volga River ◽

Trophic Resources ◽

Pike Perch ◽

The Amur River ◽

Back Calculation ◽

Abiotic And Biotic Factors

Pike-perch is an invader for the water basins of Central Kazakhstan. These species have stable self-reproductive populations in the regional waters. Back calculation method was used to investigate pike-perch growth rates in reservoirs of K. Satpayev’s channel. For comparison, the data from the other water bodies (Vyacheslavsky and Sherubay-Nurinsky water reservoirs) were used, as well as literature data. Pike-perch species from the investigated waters don’t show high growth rates. The populations from the reservoirs of K. Satpayev’s channel have quite similar growth rates with populations from the Amur river, from a number of reservoirs in the Volga river basin and from the reservoir in Spain. Sexual differences in growth have not been observed. Evaluating possible influence of various abiotic and biotic factors on the growth rate of pike-perch in the reservoirs of K. Satpayev’s channel was carried out. It has been stated that the availability of trophic resources cannot play a key role in growth dynamics because of their high abundance. Morphology of water bodies also does not play a role, as well as chromaticity, turbidity and other optical water indicators. It can be supposed that the main factor influencing growth of pike perch is the habitat’s temperature. This factor hardly ever approaches optimal values for the species in reservoirs of K. Satpaev’s channel. The possible influence of fishing selectivity on pike-perch growth rates was also evaluated. Currently, there has been imposed a moratorium on pike-perch catch. However, pike-perch is found in by-catches and in catches of amateur fishermen. It should be said that such seizures have an insignificant role in the dynamics of growth rates.

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High Performance GaAs Solar Cells Grown at High Growth Rates by Atmospheric-Pressure Dynamic Hydride Vapor Phase Epitaxy

2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) ◽

10.1109/pvsc40753.2019.8981240 ◽

2019 ◽

Author(s):

Wondwosen Metaferia ◽

Kevin L. Schulte ◽

John Simon ◽

Steve Johnston ◽

Aaron J. Ptak

Keyword(s):

Solar Cells ◽

Vapor Phase ◽

Growth Rates ◽

Atmospheric Pressure ◽

High Performance ◽

High Growth ◽

Vapor Phase Epitaxy ◽

Hydride Vapor Phase Epitaxy

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Thin, high quality GaInP compositionally graded buffer layers grown at high growth rates for metamorphic III–V solar cell applications

Journal of Crystal Growth ◽

10.1016/j.jcrysgro.2013.10.043 ◽

2014 ◽

Vol 393 ◽

pp. 64-69 ◽

Cited By ~ 9

Author(s):

I. Garcia ◽

R.M. France ◽

J.F. Geisz ◽

J. Simon

Keyword(s):

Solar Cell ◽

Growth Rates ◽

High Growth ◽

Buffer Layers ◽

High Quality

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Amorphous silicon deposited at high growth rates near the onset of microcrystallinity

Journal of Non-Crystalline Solids ◽

10.1016/s0022-3093(00)00029-6 ◽

2000 ◽

Vol 266-269 ◽

pp. 450-454 ◽

Cited By ~ 1

Author(s):

Yoram Lubianiker ◽

Yanyang Tan ◽

J.David Cohen ◽

Gautam Ganguly

Keyword(s):

Amorphous Silicon ◽

Growth Rates ◽

High Growth

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Regional variation in otolith geochemistry of juvenile Atlantic cod (Gadus morhua) in coastal Newfoundland

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2015-0353 ◽

2016 ◽

Vol 73 (10) ◽

pp. 1507-1519 ◽

Cited By ~ 5

Author(s):

Ryan R.E. Stanley ◽

Claudio DiBacco ◽

Simon R. Thorrold ◽

Paul V.R. Snelgrove ◽

Corey J. Morris ◽

...

Keyword(s):

Gadus Morhua ◽

Environmental Variability ◽

Atlantic Cod ◽

Environmental Influence ◽

Spatial Scales ◽

Early Life History ◽

Otolith Chemistry ◽

Geographic Patterns ◽

Assignment Success ◽

Scale Classification

We examined spatial variation in otolith geochemistry as a natural tag in juvenile Atlantic cod (Gadus morhua) to resolve geographic patterns during early life history. Individuals from 54 inshore sites spanned five embayments in eastern Newfoundland. Otolith composition differed at all spatial scales and related inversely to spatial scale. Classification analysis revealed increasing discrimination at coarser spatial scales: site (26%–58%), bay (49%), and coast (76%). Assignment success declined by ∼10% per added site with increasing sampling sites per bay, demonstrating fine-scale (<100 km) variation. When we partitioned environmental variability from observed otolith chemistry using predictive models, assignment success improved by 56%, 14%, and 5% for site, bay, and coast, respectively. Our results demonstrate environmental influence on spatial structure of otolith chemistry and illustrate the importance of resolving baseline variability in otolith chemistry when conducting assignment tests. Collectively, our results describe the potential utility of juvenile otolith composition in evaluating contributions of subpopulations to the Northwest Atlantic cod stock and highlight important limitations imposed by environmental variation at scales less than 100 km.

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Very High Growth Rate of 4H-SiC Using MTS as Chloride-Based Precursor

Materials Science Forum ◽

10.4028/www.scientific.net/msf.600-603.115 ◽

2008 ◽

Vol 600-603 ◽

pp. 115-118 ◽

Cited By ~ 4

Author(s):

Henrik Pedersen ◽

Stefano Leone ◽

Anne Henry ◽

Franziska Christine Beyer ◽

Vanya Darakchieva ◽

...

Keyword(s):

Growth Rate ◽

Linear Dependence ◽

Growth Rates ◽

Molar Fraction ◽

High Growth ◽

High Growth Rate ◽

Epitaxial Layers ◽

Single Precursor ◽

Very High

The chlorinated precursor methyltrichlorosilane (MTS), CH3SiCl3, has been used to grow epitaxial layers of 4H-SiC in a hot wall CVD reactor, with growth rates as high as 170 µm/h at 1600°C. Since MTS contains both silicon and carbon, with the C/Si ratio 1, MTS was used both as single precursor and mixed with silane or ethylene to study the effect of the C/Si and Cl/Si ratios on growth rate and doping of the epitaxial layers. When using only MTS as precursor, the growth rate showed a linear dependence on the MTS molar fraction in the reactor up to about 100 µm/h. The growth rate dropped for C/Si < 1 but was constant for C/Si > 1. Further, the growth rate decreased with lower Cl/Si ratio.

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Liquid fuel production via supercritical water gasification of algae: a role for solar heat integration?

Sustainable Energy & Fuels ◽

10.1039/d1se01615f ◽

2021 ◽

Author(s):

Mahesh Brahmadesham Venkataraman ◽

Alireza Rahbari ◽

Philip J van Eyk ◽

Alan W. Weimer ◽

Wojciech Lipiński ◽

...

Keyword(s):

Supercritical Water ◽

Growth Rates ◽

Algal Biomass ◽

Liquid Fuel ◽

Arable Land ◽

High Growth ◽

Heat Integration ◽

Fuel Production ◽

Supercritical Water Gasification ◽

Artificial Ponds

Algal biomass is an attractive feedstock for carbon-neutral fuel production due to high growth rates and its potential to be farmed in artificial ponds on non-arable land. Supercritical water gasification...

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