Meristic Differences in Spawning Populations of American Shad, Alosa sapidissima: Evidence for Homing to Tributaries in the St. John River, New Brunswick

1975 ◽  
Vol 32 (5) ◽  
pp. 653-660 ◽  
Author(s):  
James E. Carscadden ◽  
William C. Leggett
Keyword(s):  
New Brunswick ◽  
Multivariate Analyses ◽  
River System ◽  
Genetic Component ◽  
American Shad ◽  
Multivariate Techniques ◽  
Meristic Characters ◽  
Alosa Sapidissima ◽  
Meristic Counts

Univariate and multivariate analyses were performed on five meristic characters of American shad, Alosa sapidissima, spawning in the Miramichi, St. John, Connecticut, and Hudson rivers. In 71% of the comparisons, significant differences in mean numbers of meristic characters existed between river populations and between tributaries within the St. John River system. Comparisons of populations using multivariate techniques revealed that percentage of overlap of meristic characters was low (< 1% in most comparisons). It is suggested that shad not only home to their natal river but also to their natal tributary. The results suggest that in shad, meristic counts are strongly influenced by a genetic component.

Origin and Characteristics of "Fall-Run" American Shad (Alosa sapidissima) from the St. John River, New Brunswick

1976 ◽  
Vol 33 (8) ◽  
pp. 1764-1770
Author(s):  
W. L. Gabriel ◽  
W. C. Leggett ◽  
J. E. Carscadden ◽  
B. D. Glebe
Keyword(s):  
New Brunswick ◽  
Water Content ◽  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Stomach Contents ◽  
American Shad ◽  
Meristic Characters ◽  
River Population ◽  
Alosa Sapidissima

American shad (Alosa sapidissima) taken from the St. John River, New Brunswick, during the fall of 1973 were studied to determine river of origin and duration of residence in the river. One-way analyses of variance and classification by discriminant function analysis of meristic characters suggested that most of these shad were part of the St. John River population. Fat and water content of the fish, maturity, and stomach contents suggested that the movement into the estuary was recent and not a spawning migration.

Morphological differentiation in African catfish (Clarias gariepinus) from three different populations in Nigeria

2021 ◽  
Vol 16 (1) ◽  
pp. 13-20
Author(s):  
Popoola Omoniyi Michael ◽  
Olagunju Oluwatosin Olubunmi
Keyword(s):  
Clarias Gariepinus ◽  
Morphological Differentiation ◽  
Principal Component ◽  
Individual Species ◽  
African Catfish ◽  
Morphometric Traits ◽  
Meristic Characters ◽  
High Positive Correlation ◽  
Meristic Counts ◽  
Major Cluster

AbstractIntraspecific morphological variation in Clarias gariepinus was studied in three water bodies. Twenty-three morphometric characteristics and seven meristic were used. Principal component (PC) analysis showed that morphometric traits of River Osun and Ogbese were somewhat related while that of Aago showed no relatedness, there were no difference among the meristic counts of the populations. PC1, and PC2 accounted for 93% and 4% of the variation observed in the populations. High positive correlation was observed in Aago (r = 0.872, b = 2.10) and Ogbese population while low correlation and negative allometric growth (r = 0.425 and b= 1.38) was observed in Asejire population. Cluster analysis revealed that three studied populations are separated into two major clusters, with samples from Asejire and Ogbese population found within the same cluster but different sub- clusters, similarly some of samples from Aago were also within the same cluster while samples 10 were found on a separate and major cluster. The study confirms the variability among individual species within each population, indicates the presence of genetic diversity among the populations of C. gariepinus and the Pre-anal distance and dorsal fin ray count could be employed in the identification of populations of catfish. Key words: morphometric traits, meristic characters, populations, allometric

Relationship of upstream migrating adult Atlantic salmon (Salmo salar) and stream discharge within Catamaran Brook, New Brunswick

2007 ◽  
Vol 64 (3) ◽  
pp. 563-573 ◽  
Author(s):  
Sean C Mitchell ◽  
Richard A Cunjak
Keyword(s):  
Body Size ◽  
Atlantic Salmon ◽  
New Brunswick ◽  
Salmo Salar ◽  
Predictive Ability ◽  
River System ◽  
Low Flow ◽  
Stream Discharge ◽  
Atlantic Salmon Salmo Salar ◽  
Adult Abundance

Stream discharge has long been associated with abundance of returning adult spawning salmonids to streams and may also affect body size distribution of adult salmon as low flows interfere with returns of larger-bodied fish. We examined these relationships of abundance and body size within Catamaran Brook, a third-order tributary to the Miramichi River system of New Brunswick, Canada, to investigate the causes of a declining trend in annual returns of Atlantic salmon (Salmo salar) to this stream. Regression models of adult abundance, proportion of the run as grilse, and body size of returning adults as functions of maximum daily stream discharge during the period of upstream spawner migration were constructed. Adult abundance shows a logarithmic relationship with stream discharge and provides good predictive ability, while appearing to not be significantly related to adult abundance in the larger Miramichi system. The proportion as grilse in the run and female body size are also logarithmically related to stream discharge, with low flow years being very influential in the regressions. These relationships of Atlantic salmon population abundance and body size characteristics have implications with respect to stock integrity and production of the following generation.

scholarly journals Evasive responses of American shad (Alosa sapidissima) to ultrasonic stimuli

2003 ◽  
Vol 4 (2) ◽  
pp. 25-30 ◽  
Author(s):  
Dennis T. T. Plachta ◽  
Arthur N. Popper
Keyword(s):  
American Shad ◽  
Alosa Sapidissima
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