Growth, Age at Metamorphosis, and Sex Ratio of Northern Brook Lamprey in a Tributary of Southern Lake Superior

Copeia ◽  
1970 ◽  
Vol 1970 (2) ◽  
pp. 326 ◽  
Author(s):  
Harold A. Purvis
Keyword(s):  
Sex Ratio ◽  
Lake Superior ◽  
Brook Lamprey

scholarly journals Population status and demographics of Lake Sturgeon in the Bad and White rivers, Wisconsin

2019 ◽  
Vol 10 (2) ◽  
pp. 442-457 ◽  
Author(s):  
Joshua T. Schloesser ◽  
Henry R. Quinlan
Keyword(s):  
Sex Ratio ◽  
Adult Population ◽  
Lake Superior ◽  
Return Time ◽  
Lake Sturgeon ◽  
River Population ◽  
Mature Adults ◽  
Rehabilitation Plan ◽  
Population Trajectory ◽  
Spawning Run

Abstract Lake Sturgeon Acipenser fulvescens rehabilitation efforts in Lake Superior are guided by a rehabilitation plan that sets goals and criteria for a self-sustaining population, including a minimum of 1,500 mature adults, roughly equal sex ratio, and annual exploitation rates < 5%. The Bad and White rivers, Wisconsin host a genetically unique Lake Sturgeon population that is utilized by state-licensed recreational anglers and tribal subsistence fishers. Our objectives were to 1) determine if the Bad River population meets rehabilitation plan targets for a self-sustaining population, 2) assess harvest of Lake Sturgeon by recreational anglers and tribal subsistence fishers for compatibility with rehabilitation goals, 3) determine population trajectory from annual spawning runs, and 4) describe population demographics given the unique physical features of Lake Superior. We sampled Lake Sturgeon in the Bad and White rivers with gill nets over a 17-y period (2001 to 2017). The observed sex ratio in spawning runs was 2.2:1 (male : female), but calculated at 1.6:1 for the entire adult population on the basis of abundance estimates. Weight–length relationships converted to a standardized modified form factor indicated lower condition and possibly lower female fecundity compared with other large North American populations. Annual spawning run size estimates over time indicated that the population trajectory was stable to slightly increasing, and during 2016 was 739 and 241 individuals in the Bad and White rivers, respectively. Total population size (including nonspawners) exceeded 1,500 individuals, which met Lake Superior rehabilitation criteria for a self-sustaining population. Estimates of 1,426 males and 882 females were considered conservative because 472 unknown-sex fish could not be accounted for in return time and abundance models. Spawning return times were 2 or 3 y for males and 4 to 6 y for females, longer than many other populations. Exploitation by recreational anglers and tribal subsistence fishers was 1.3% or lower and met the rehabilitation plan target of < 5%, but we recommend exploitation not exceed 3.1% to maintain a self-sustaining population. These findings help gauge rehabilitation progress in Lake Superior and better describe the demographics of a remnant self-sustaining Lake Sturgeon population in Lake Superior.

Liver and muscle composition of mature lampreys

1971 ◽  
Vol 49 (6) ◽  
pp. 801-805 ◽  
Author(s):  
E. Kott
Keyword(s):  
Protein Content ◽  
Water Content ◽  
Sexual Difference ◽  
Lake Superior ◽  
Sea Lamprey ◽  
Fat Content ◽  
Brook Lamprey ◽  
Muscle Composition ◽  
Cayuga Lake ◽  
Approximate Composition

Lengths, weights, liver weights, and color of sea lamprey (Petromyzon marinus) from Cayuga Lake and Lake Superior and of American brook lamprey (Lampetra lamottei) were recorded. Liver and muscle of the sea lamprey samples were analyzed for fat, water, and protein content. American brook lamprey were analyzed only for fat and water content. In both populations of sea lamprey, male livers had a higher fat content and lower water content than female livers, but the protein content was similar in the sexes. The liver composition of the Lake Superior sample, which represented a sample of late migrants, was not significantly different from the liver composition of earlier spawners (Lake Cayuga sample). In both populations of sea lamprey there was no sexual difference in muscle composition; however, the muscle fat was reduced and the muscle water was elevated in the late migrants as compared to the earlier migrants. No sexual differences in the composition of either the liver or the muscle were found in American brook lamprey. Although the brook lamprey examined were early migrants both liver and muscle had a reduced fat content when compared to early sea lamprey migrants.Using Lake Cayuga data, the approximate composition of male sea lamprey liver at the start of the spawning migration was 20% fat, 50% water, and 15% protein. Comparable values for females were 5% fat, 75% water, and 15% protein. The muscle composition, of both sexes at the beginning of the migration, was 8% fat, 70% water, and 20% protein.

Changes in the Distribution of Native Lampreys in Lake Superior Tributaries in Response to Sea Lamprey (Petromyzon marinus) Control, 1953–77

1980 ◽  
Vol 37 (11) ◽  
pp. 1872-1885 ◽  
Author(s):  
R. J. Schuldt ◽  
R. Goold
Keyword(s):  
Endemic Species ◽  
Chemical Control ◽  
Drainage Basin ◽  
Lake Superior ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Brook Lamprey ◽  
Habitat Temperature ◽  
Sea Lampreys

Populations of three species of lampreys, American brook lamprey (Lampetra lamottei), northern brook lamprey (Ichthyomyzon fossor), and silver lamprey (I. unicuspis), endemic to the Lake Superior drainage basin have declined since chemical control of the sea lamprey (Petromyzon marinus) was begun; 64% (103 of 162) of the streams inhabited by endemic species have required treatment. The parasitic silver lamprey was most adversely affected by lampricide applications. Though 4278 were captured at 35 of 55 Lake Superior barriers in 1959, a total of 91 were reported in only nine tributaries and the St. Marys River from 1973 to 1977. American brook lampreys were least affected by chemical control and have disappeared from 6 of 42 treated streams which they inhabited. Ichthyomyzon larvae are no longer found in 41 of 81 treated streams they once inhabited, though few larvae were found in many of these streams. Several factors affected the vulnerability of native lampreys to chemicals. Nonparasitic lampreys, especially American brook lampreys, inhabited headwater areas which were often not invaded by sea lampreys, but silver lampreys spawned in lower reaches and their entire stream distribution was exposed to the effects of the lampricide. Differences in fecundity of lampreys also affected their recovery after chemical treatments.Key words: Ichthyomyzon fossor, ichthyomyzon unicuspis, Lampetra lamottei, streams, distribution, habitat, temperature, fecundity, survival, TFM

Density-Dependent Maturation, Growth, and Female Dominance in Lake Superior Lake Herring (Coregonus artedii)

1991 ◽  
Vol 48 (4) ◽  
pp. 569-576 ◽  
Author(s):  
Stephen H. Bowen ◽  
Donna J. D'angelo ◽  
Stephen H. Arnold ◽  
Michael J. Keniry ◽  
Ronald J. Albrecht
Keyword(s):  
Sex Ratio ◽  
Egg Production ◽  
Lake Superior ◽  
Adult Mortality ◽  
Female Dominance ◽  
Low Density ◽  
Young Males ◽  
Recruitment Failure ◽  
Coregonus Artedii ◽  
Lake Herring

Density-related changes in age at maturation, sex ratio of recruits, growth, and fecundity at very low density result in spawning populations which comprise many older females and few young males and in which egg production per lake herring (Coregonus artedii) is increased by a factor of five. Age of maturation is delayed at low density for females, but not for males. Thus, males dominate the youngest age classes but females become increasingly more abundant from age 2 + through age 6 +. A model of lake herring population structure showed that although delayed maturation accounts for many characteristics of depressed populations, it does not explain overall population femaleness. The model was used to evaluate effects of differential adult mortality, recruitment failure, and changes in the sex ratio of recruits, and only the latter provided an adequate explanation for overall femaleness. Despite the apparently compensatory nature of these responses, the slow and unsteady recovery of depressed Lake Superior populations during the last two decades indicates that one or more additional factors play important roles in determination of year class strength.

Development of apical pits in chloride cells of the gills of Pimephales promelas after chronic exposure to acid water

1983 ◽  
Vol 41 ◽  
pp. 462-463
Author(s):  
Richard L. Leino ◽  
Jon G. Anderson ◽  
J. Howard McCormick
Keyword(s):  
Confidence Interval ◽  
Chronic Exposure ◽  
Lake Superior ◽  
Pimephales Promelas ◽  
Chloride Cells ◽  
Fathead Minnows ◽  
Secondary Lamellae ◽  
Untreated Water ◽  
Water Ph ◽  
Flow Through

Groups of 12 fathead minnows were exposed for 129 days to Lake Superior water acidified (pH 5.0, 5.5, 6.0 or 6.5) with reagent grade H2SO4 by means of a multichannel toxicant system for flow-through bioassays. Untreated water (pH 7.5) had the following properties: hardness 45.3 ± 0.3 (95% confidence interval) mg/1 as CaCO3; alkalinity 42.6 ± 0.2 mg/1; Cl- 0.03 meq/1; Na+ 0.05 meq/1; K+ 0.01 meq/1; Ca2+ 0.68 meq/1; Mg2+ 0.26 meq/1; dissolved O2 5.8 ± 0.3 mg/1; free CO2 3.2 ± 0.4 mg/1; T= 24.3 ± 0.1°C. The 1st, 2nd and 3rd gills were subsequently processed for LM (methacrylate), TEM and SEM respectively.Three changes involving chloride cells were correlated with increasing acidity: 1) the appearance of apical pits (figs. 2,5 as compared to figs. 1, 3,4) in chloride cells (about 22% of the chloride cells had pits at pH 5.0); 2) increases in their numbers and 3) increases in the % of these cells in the epithelium of the secondary lamellae.

Enumeration and Identification of Asbestos Fibres in Water

1974 ◽  
Vol 32 ◽  
pp. 526-527 ◽  
Author(s):  
O. Mudroch ◽  
J. R. Kramer
Keyword(s):  
Water Supply ◽  
Water Samples ◽  
Drainage Basin ◽  
Lake Superior ◽  
Research Work ◽  
List Type ◽  
The West ◽  
Asbestos Fibre ◽  
Amphibole Asbestos

Approximately 60,000 tons per day of waste from taconite mining, tailing, are added to the west arm of Lake Superior at Silver Bay. Tailings contain nearly the same amount of quartz and amphibole asbestos, cummingtonite and actinolite in fibrous form. Cummingtonite fibres from 0.01μm in length have been found in the water supply for Minnesota municipalities.The purpose of the research work was to develop a method for asbestos fibre counts and identification in water and apply it for the enumeration of fibres in water samples collected(a) at various stations in Lake Superior at two depth: lm and at the bottom.(b) from various rivers in Lake Superior Drainage Basin.

Lake Superior

2009 ◽  
Author(s):  
Louis Agassiz
Keyword(s):  
Lake Superior
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