Genetic, maternal, and tank determinants of growth in hatchery-reared juvenile Arctic charr (Salvelinus alpinus)

1991 ◽  
Vol 69 (3) ◽  
pp. 655-660 ◽  
Author(s):  
B. G. E. de March
Keyword(s):  
Egg Size ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Logistic Growth ◽  
Coefficients Of Variation ◽  
The Social ◽  
Change In The Mean ◽  
Factorial Mating ◽  
Unique Distribution ◽  
The Mean

The relative importance of genetic, maternal, and tank effects on the growth of juvenile Arctic charr (Salvelinus alpinus) was examined in an incomplete factorial mating design (4 dams × 4 sires) with stock from the Fraser River, Labrador, Canada. Egg size and hatching success were related only to dams. Mean weights at 30, 75, and 125 days after swim-up, logistic growth curve parameters describing the change in the mean weight, and a measure of condition, all described within families, were significantly related to both dams and sires and were also correlated with each other. The early patterns of significant differences due to dams and sires changed after approximately 125 days. After this time the mean weights in tanks, although still increasing, became negatively correlated with their coefficients of variation (CV), which had changed only slightly with time. The magnitude of the CVs could not be attributed to specific parents. The changed patterns of differences in the means with time suggested that either (i) the social climate within tanks, measured as the CV, affected the growth of all fish even though they were neither crowded nor underfed, or (ii) an individual's ability to grow was dependent not only on its phenotype (initial weight) but also on its genotype, expressed only in data from sibs. These laboratory results may relate to unique distribution and fitness characteristics of natural Arctic charr populations.

Hatchery Growth of Pure Strains and Intraspecific Hybrids of Juvenile Arctic Charr, Salvelinus alpinus (Canadian × Norwegian Charr)

1991 ◽  
Vol 48 (6) ◽  
pp. 1109-1116 ◽  
Author(s):  
B. G. E. de March
Keyword(s):  
Growth Parameters ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Size Variation ◽  
Large Size ◽  
Maternal Characteristic ◽  
Coefficients Of Variation ◽  
Sib Families ◽  
The Mean ◽  
Intraspecific Hybrids

Growth parameters of 36 tank populations representing 23 full-sib families of Nauyuk and Norwegian Arctic charr (Salvelinus alpinus) and both reciprocal hybrids were determined for 1 yr. Hatching success of families was a maternal characteristic. Mean weights of families at 30 d after swim-up were related to maternal effects as well as the general and specific combining abilities of the two strains, with the weight contribution of the Nauyuk parent(s) larger than that of the Norwegian. At 125 d after swim-up, the mean weights and coefficients of variation (CVs) in the four types of crosses were Nauyuk dam × Nauyuk sire, 2.05 g ± 20%; Nauyuk dam × Norwegian sire, 2.10 g ± 24%; Norwegian dam × Nauyuk sire, 1.91 g ± 26%; and Norwegian dam × Norwegian sire, 1.71 g ± 31%. After 125 d, the Nauyuk dam × Norwegian sire families showed superior growth, while the Norwegian dam × Nauyuk sire families grew slowly and developed large size variation. At 325 d, reciprocal effects were evident, and mean weights and CVs were Nauyuk dam × Nauyuk sire, 36 g ± 45%; Nauyuk dam × Norwegian sire, 43 g ± 48%; Norwegian dam × Nauyuk sire, 30 g ± 68%; and Norwegian dam × Norwegian sire, 38 g ± 36%. The largest individual fish in the experiment were hybrids.

Estimation of Submergent Plant Bed Biovolume using Acoustic Range Information

1990 ◽  
Vol 47 (4) ◽  
pp. 805-812 ◽  
Author(s):  
G. L. Thomas ◽  
S. L. Thiesfeld ◽  
S. A. Bonar ◽  
R. N. Crittenden ◽  
G. B. Pauley
Keyword(s):  
Plant Biomass ◽  
Direct Estimate ◽  
Cross Sectional ◽  
Devils Lake ◽  
Coefficients Of Variation ◽  
Change In The Mean ◽  
Acoustic Surveys ◽  
The Mean ◽  
Fish Interactions ◽  
Chart Recording

Acoustic measurements of the distance between the water surface, top of the aquatic plants, and bottom of the water column were made using chart recording echosounders. The vertical cross sectional area (m2), height (m), biovolume (m3), of aquatic plant beds and variances were computed for three surveys of Devils Lake, Oregon, in May, July, and September, 1986 when coefficients of variation for the plant bed biovolume estimates were 0.18, 0.05, and 0.06, respectively (n = 14). Coefficients of variation for plant biomass estimates (g/m2) computed from SCUBA quadrat samples collected concurrently with the acoustic surveys, were 0.98 (n = 48), 0.81 (n = 90), and 1.05 (n = 90), respectively. The higher precision of the biovolume estimates allow for a 5- to 18-fold greater capability to detect a change in the mean. The lower costs of the biovolume estimates allow for a 10- to 33-fold greater precision-for-cost. The plant bed biovolume variable contains ecologically different information than the biomass variable in that it provides a direct estimate of the amount of aquatic habitat in a lake that is influenced by plants; it should prove useful for evaluating plant control practices and possibly for studying plant-fish interactions.

Measurements and weights of eggs of the Canada goose, Branta canadensis, analyzed and compared with those of other species

1978 ◽  
Vol 56 (4) ◽  
pp. 676-687 ◽  
Author(s):  
T. H. Manning
Keyword(s):  
Clutch Size ◽  
Egg Size ◽  
Branta Canadensis ◽  
Published Data ◽  
Canada Goose ◽  
True Density ◽  
Fresh Weight ◽  
Coefficients Of Variation ◽  
Branta Canadensis Interior ◽  
The Mean

The length and breadth of 334 eggs (82 clutches) of Branta canadensis interior were measured and 125 eggs (30 clutches) were weighed. Published and unpublished data for eggs of Branta canadensis maxima, hutchinsi, moffitti, and minima were also used and comparisons made with published data on 31 other species from seven ordersMeasurements of full clutches rather than of one egg per clutch proved advantageous. The means for length (L) and breadth (B) were 83.87 ± 0.366 mm and 56.60 ± 0.126 mm; those for the indices of volume (LB2), shape (100B/L), and density (100W/LB2), 268.98 ± 1.897 cm3, 67.34 ± 0.248, and 55.21 ± 0.190; that for weight (W), an estimated 1.5 days after the commencement of incubation, 150.02 ± 1.718. The clutch variances were significant and accounted for about half the total variance. The lightest egg weighed 68% of the heaviest and the coefficients of variation varied from 2.48 (breadth) to 7.17 (weight). The last eggs were significantly lighter and smaller than earlier eggs, owing to their lesser breadth. Correlations between egg size and clutch size were not constant. Correlations between length and breadth were generally positive, those between volume and shape generally negative. The mean true density of the eggs was estimated to be 1.085, the mean true volume 137.74 cm3, the mean fresh weight 150.95 g, and the mean of the factor k for the correction of the ellipsoidal volume, 0.9780. All differences between the five races for length, breadth, and volume were significant. Joint non-overlaps varied from 64 to 100%.

scholarly journals Differences among families in craniofacial shape at early life-stages of Arctic charr (Salvelinus alpinus)

2020 ◽  
Author(s):  
Samantha Victoria Beck ◽  
Katja Räsänen ◽  
Camille A. Leblanc ◽  
Skúli Skúlason ◽  
Zophonías O. Jónsson ◽  
...  
Keyword(s):  
Maternal Effects ◽  
Phenotypic Variation ◽  
Early Life ◽  
Egg Size ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Craniofacial Development ◽  
Offspring Size ◽  
Life Stages ◽  
Early Life Stages

Abstract Background Organismal fitness can be determined at early life-stages, but phenotypic variation at these early life-stages has rarely been considered in studies on evolutionary diversification. The trophic apparatus has been shown to contribute to sympatric resource-mediated divergence in several taxa. However, processes underlying this diversification are poorly understood. Using a phenotypically variable morph of Icelandic Arctic charr (Salvelinus alpinus), we reared offspring from multiple families under standardized laboratory conditions and tested to what extent family (i.e. direct genetic and maternal effects) contributes to offspring morphology at hatching (H) and first feeding (FF). To understand the underlying mechanisms behind early life-stage variation in morphology, we examined how craniofacial shape varied according to family, egg size, offspring size and individual candidate genes related to craniofacial development. Finally, we assessed whether craniofacial shape and expression of genes related to craniofacial development covaried. Results We found effects of family for offspring craniofacial shape at both H and FF, whilst relative expression levels of Sgk1 (a gene involved in craniofacial shape divergence) correlated with craniofacial shape at FF. However, there were no evidence to suggest that mean egg size or individual offspring size influenced offspring morphology. Conclusions This study provides evidence for within population family effects for phenotypic variation in trophic morphology, indicating the potential for genetic and/or maternal effects to facilitate resource polymorphism.

Connection between egg size and early mortality in arctic charr, Salvelinus alpinus

Aquaculture ◽  
2000 ◽  
Vol 187 (3-4) ◽  
pp. 315-317 ◽  
Author(s):  
Bjarni Jónsson ◽  
Einar Svavarsson
Keyword(s):  
Egg Size ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Early Mortality

Evaluation of Variation in Permeability Measurements when Using the MARK VI Standpipe

1989 ◽  
Vol 46 (3) ◽  
pp. 447-450 ◽  
Author(s):  
Michael K. Young ◽  
Wayne A. Hubert ◽  
Thomas A. Wesche
Keyword(s):  
Sampling Strategy ◽  
Repeated Readings ◽  
Constant Flow ◽  
Flow Conditions ◽  
Coefficients Of Variation ◽  
Repeated Sampling ◽  
Change In The Mean ◽  
The Mean ◽  
A Site

Using the MARK VI standpipe in a substrate-filled flume under constant flow conditions, we found significant differences in permeability readings made by different people at four of five sites. Coefficients of variation at each site ranged from 27 to 79%. Readings usually varied greatly for each person at each site. To detect a 10% change in the mean permeability at single sites (α = 0.05) would require from 34 to 90 samples; for a 30% change, the range was 4 – 10. Repeated sampling at a site did not produce directional changes in permeability estimates, nor did the performance of individuals change during the test. We propose a sampling strategy based on repeated readings taken by one person.

scholarly journals Differences among families in craniofacial shape at early life-stages of Arctic charr (Salvelinus alpinus)

2020 ◽  
Author(s):  
Samantha Victoria Beck ◽  
Katja Räsänen ◽  
Camille A. Leblanc ◽  
Skúli Skúlason ◽  
Zophonías O. Jónsson ◽  
...  
Keyword(s):  
Early Life ◽  
Egg Size ◽  
Developmental Stages ◽  
Salvelinus Alpinus ◽  
Arctic Charr ◽  
Life Stage ◽  
Early Life Stage ◽  
Offspring Size ◽  
Life Stages ◽  
Early Life Stages

Abstract Background Organismal fitness can be determined at early life-stages, but phenotypic variation at early life-stages is rarely considered in studies on evolutionary diversification. The trophic apparatus has been shown to contribute to sympatric resource-mediated divergence in several taxa. However, processes underlying diversification in trophic traits are poorly understood. Using phenotypically variable Icelandic Arctic charr (Salvelinus alpinus), we reared offspring from multiple families under standardized laboratory conditions and tested to what extent family (i.e. direct genetic and maternal effects) contributes to offspring morphology at hatching (H) and first feeding (FF). To understand the underlying mechanisms behind early life-stage variation in morphology, we examined how craniofacial shape varied according to family, offspring size, egg size and candidate gene expression. Results Craniofacial shape (i.e. the Meckel’s cartilage and hyoid arch) was more variable between families than within families both across and within developmental stages. Differences in craniofacial morphology between developmental stages correlated with offspring size, whilst within developmental stages only shape at FF correlated with offspring size, as well as female mean egg size. Larger offspring and offspring from females with larger eggs consistently had a wider hyoid arch and contracted Meckel’s cartilage in comparison to smaller offspring.Conclusions This study provides evidence for family-level variation in early life-stage trophic morphology, indicating the potential for parental effects to facilitate resource polymorphism.

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