Factors Influencing Year-Class Strength of Percids: A Summary and a Model of Temperature Effects

1977 ◽  
Vol 34 (10) ◽  
pp. 1900-1909 ◽  
Author(s):  
J. F. Koonce ◽  
T. B. Bagenal ◽  
R. F. Carline ◽  
K. E. F. Hokanson ◽  
M. Nagięć
Keyword(s):  
Life History ◽  
Temperature Regime ◽  
Early Life ◽  
Yellow Perch ◽  
Lake Erie ◽  
Perca Flavescens ◽  
Early Life History ◽  
Direct Effects ◽  
Factors Influencing ◽  
Class Strength

Factors regulating year-class strength in the percid genera Stizostedion and Perca are summarized. Some index of water temperature regime correlates significantly with year-class strength of percids in many water bodies. Moderate synchrony of year-class strength is noted for walleye (Stizostedion vitreum vitreum) in several lakes in North America. A probablistic model is proposed to explain the basis of temperature dependence of year-class strength in percids, but tests of the model using Lake Erie data indicated that observed correlations between temperature and year-class strength of yellow perch (Perca flavescens) and walleye may not be the result of direct effects of the temperature regime on survivorship of early life-history phases. Key words: Percidae, year-class strength, temperature, probalistic model, early life history

Factors affecting the early life history of yellow perch,Perca flavescens

1985 ◽  
Vol 12 (1) ◽  
pp. 47-56 ◽  
Author(s):  
Melbourne C. Whiteside ◽  
C. Michael Swindoll ◽  
William L. Doolittle
Keyword(s):  
Life History ◽  
Early Life ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Early Life History ◽  
Factors Affecting ◽  
History Of

The early life-history dynamics of Northeast Arctic cod: levels of natural mortality and abundance during the first 3 years of life

2016 ◽  
Vol 73 (2) ◽  
pp. 246-256 ◽  
Author(s):  
Bjarte Bogstad ◽  
Natalia A. Yaragina ◽  
Richard D.M. Nash
Keyword(s):  
Life History ◽  
Early Life ◽  
Egg Production ◽  
Gadus Morhua ◽  
Early Life History ◽  
Natural Mortality ◽  
Arctic Cod ◽  
Stock Assessments ◽  
Class Strength ◽  
New Generation

Recruitment at age 3 of the Northeast Arctic cod (Gadus morhua) is highly variable. It has generally been believed that year-class strength for this stock is determined prior to settlement to the bottom after about 6 months. However, newer observations indicate that year-class strength may change considerably between settlement and recruitment at age 3. Our analyses cover the 1983–2009 year classes where comprehensive data from total egg production (TEP), surveys, and stock assessments were available for a thorough examination of these cohorts. On average, only 6 out of 1 million of a new generation at the TEP stage reaches the age of recruitment to the fishery. The between-cohort variability in abundance is greatest at the ages 0–1 stage. Although the mortality is highest during the first months of life, the year-class strength can also be affected considerably by processes taking place between the 0-group stage (∼6 months) and age 3. The mortality in this period of life seems to be strongly density-dependent, and cannibalism is an important source of mortality.

scholarly journals Discovery of an Undocumented Lake Sturgeon Spawning Site in the Headwaters of the Niagara River

2018 ◽  
Vol 9 (1) ◽  
pp. 266-273 ◽  
Author(s):  
Rachel D. Neuenhoff ◽  
Jonah L. Withers ◽  
Lori A. Davis ◽  
Nicholas D. Markley ◽  
Stephanie Dowell ◽  
...  
Keyword(s):  
Life History ◽  
Early Life ◽  
Lake Erie ◽  
Stock Assessment ◽  
Early Life History ◽  
Lake Sturgeon ◽  
Western Basin ◽  
Niagara River ◽  
Spawning Site ◽  
Spawning Sites

Abstract Information about spawning fish is important to stock-assessment data needs (i.e., recruitment and fecundity) and management (i.e., habitat connectivity and protection). In Lake Erie, information about Lake Sturgeon Acipenser fulvescens early-life history is available for the Detroit River and Lake St. Clair system in the western basin, but fisheries biologists know comparatively little about Lake Sturgeon in the eastern basin. Although researchers have summarized historical spawning areas, no known natural Lake Sturgeon spawning site is described in Lake Erie proper. Researchers documented a remnant population of reproductively mature Lake Sturgeon near the headwaters of the Niagara River in eastern Lake Erie in 2011. Researchers hypothesized that a spawning site was likely in the immediate vicinity of the Niagara River headwaters near Buffalo Harbor, New York; however, its exact location was unknown. We attempted to locate spawning sites near the confluence of the Niagara River using egg traps at three potential spawning sites. We identified Lake Sturgeon eggs at one of these sites using morphological and genetic techniques. Lake Sturgeon eggs collected on one sampling trip began to emerge when placed in preservative, confirming that eggs deposited at this site are fertilized and viable, and that the area supports viable embryos. This discovery fills data gaps in the early-life history for this population, which has domestic and international management implications with respect to proposed recovery targets, stock assessment models, habitat remediation efforts, and status determinations of a protected species in a geographic region designated as an Area of Concern by the International Joint Commission.

Descriptions of eggs, larvae, and early juveniles of the Iowa darter, Etheostoma exile (Girard), from Lac Heney, Quebec

1987 ◽  
Vol 65 (5) ◽  
pp. 1264-1269 ◽  
Author(s):  
Thomas P. Simon ◽  
Daniel J. Faber
Keyword(s):  
Life History ◽  
Early Life ◽  
Yellow Perch ◽  
Aquatic Macrophytes ◽  
Morphological Characteristics ◽  
Early Life History ◽  
Tree Roots ◽  
Early Juvenile ◽  
Juvenile Stages

Descriptive morphology of egg, larval, and early juvenile stages of the Iowa darter, Etheostoma exile (Girard), from Lac Heney, Quebec, were examined using morphological, meristic, morphometric, and pigment characteristics. The Iowa darter is a phyto-lithophil spawning on aquatic macrophytes and exposed tree roots. Ova are weakly indented and range in diameter from 0.9 to 1.3 mm, with larvae presumably hatching at ca. 3.6 mmTL. The Iowa darter has 16–18 preanal myomeres (typically 17), and from 20–23 postanal myomeres. Pigmentation is superficially most similar to the yellow perch. A synopsis of the known aspects of the early life history is presented and distinctive morphological characteristics of syntopic percids are compared.

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