The Smallmouth Bass Fishery of South Bay, Lake Huron

1955 ◽  
Vol 12 (1) ◽  
pp. 147-177 ◽  
Author(s):  
J. M. Fraser
Keyword(s):  
Fork Length ◽  
Smallmouth Bass ◽  
Large Percentage ◽  
Lake Huron ◽  
Population Estimates ◽  
Release Point ◽  
Sport Fishery ◽  
Class Strength ◽  
One Year ◽  
Creel Census

The smallmouth bass (Micropterus dolomieui) population of South Bay, Lake Huron and the sport fishery imposed on it have been studied by means of marking and creel census carried out during the years 1947 to 1952 inclusive. Population estimates of legal-sized bass (over 10 inches–fork length), based on the recovery of marked fish, show a decrease from 5,900 fish in 1947 to 2,900 in 1949 with an increase again to 5,700 in 1952. The number of bass caught per 100 rod-hours in these years was 89, 51 and 87, respectively. The recovery of the population from its low in 1949 was due solely to the 1947 year-class which dominated the fishery in 1950, 1951 and 1952, contributing 34%, 71% and 67%, respectively, of the anglers' catch in these years. Analysis of scale samples of the anglers' catch shows considerable variation in year-class strength. In contrast to the 3,500 fish contributed to the anglers' creel by the 1947 year-class, the 1945 year-class contributed only 400 fish.South Bay bass enter the sport fishery in small numbers at age III and 70% of the anglers' catch consisted of age-III to age-V fish. Sixty per cent of the legal-sized population of bass present in South Bay in one year are taken by anglers in the succeeding 4–5 years at the present exploitation.A large percentage of the bass population is located in the Inner Basin of South Bay where they are dispersed in varying concentrations along the shoreline. During the five-year study 3,331 bass were tagged and, although the loss of tags was high, 692 were recaptured by trap nets in the same season they were released. Eighty-five per cent of these were taken within two miles of their release point. Of 60 bass recaptured a year after tagging, 43 (72%) were taken within two miles of their release point. Only five per cent of all recorded recaptures were caught over five miles from their release point. Larger bass tended to range farther than small bass.

The Thermal Regime of South Bay, Manitoulin Island

1967 ◽  
Vol 24 (1) ◽  
pp. 101-125 ◽  
Author(s):  
A. M. McCombie
Keyword(s):  
Thermal Regime ◽  
Thermal Stratification ◽  
Yellow Perch ◽  
Lake Trout ◽  
Smallmouth Bass ◽  
Lake Huron ◽  
Vertical Temperature ◽  
Class Strength ◽  
Influence Of Temperature On ◽  
History Of

The thermal regime of South Bay is described from records collected from 1953 to 1962 with thermometers, thermographs, and bathythermographs, the last being cast at 11 stations along the bay and one in Lake Huron. Warming begins in April and thermal stratification is established in June. Shallow areas warm more rapidly than deep in the spring and cool more quickly in autumn. The boundary between the epilimnion and the thermocline becomes sharper as summer advances but the transition from thermocline to hypolimnion remains gradual. The average seasonal trend of surface temperatures is a sine function with a maximum of 66 F in mid August and a minimum of 34 F in late March, though values outside this range occur frequently. At 180 ft the maximum of 47 F is attained in November. At the lake and outermost bay stations there is a temperature slump in June and July which may be due to an upwelling in the lake. Evidence of an exchange of water between the lake and bay is seen in vertical temperature sections and water movements Variations in epilimnial temperatures are correlated with those of the air temperature, but variations in epilimnial and hypolimnial temperatures appear to be unrelated. Finally, literature describing the influence of temperature on the year class strength of smallmouth bass, the distribution of lake trout, the growth of yellow perch, and the life history of Pontoporeia in South Bay is reviewed.

Dynamics of An Exploited Population of Lake Whitefish (Coregonus clupeaformis) In Lake Huron

1983 ◽  
Vol 40 (10) ◽  
pp. 1556-1567 ◽  
Author(s):  
B. A. Henderson ◽  
J. J. Collins ◽  
J. A. Reckahn
Keyword(s):  
Fork Length ◽  
Lake Huron ◽  
Population Abundance ◽  
Coregonus Clupeaformis ◽  
Lake Whitefish ◽  
Stock Size ◽  
Parental Stock ◽  
Intrinsic Mechanism ◽  
Class Strength ◽  
Population Sizes

A population of lake whitefish (Coregonus clupeaformis) in the waters off eastern Manitoulin Island in Lake Huron was sampled from 1950 to 1982 by an experimental pound net in the outer basin of South Bay. Year-class strength increased markedly from 1947 to 1977; the increase began with the decline of the 1943 year-class. The fork length attained by age 1–3 fish decreased during the study, but no trend was apparent for older fish. Natural mortality of year-classes varied considerably, and was probably related to the abundance of lamprey. The annual exploitation rate increased from 1 to 37% between 1960 and 1977. Year-class strength was not correlated with the thermal regime during spawning and hatching. Recruitment was a function of parental stock size, and there was evidence that survival from the egg to juvenile stage was inversely correlated with parental stock size. Instantaneous growth rates (G) during the 2nd year of growth were inversely related to year-class strength. Growth (G) in the 1st year was positively correlated with estimated surface water temperatures. The sizes attained by ages 2 and 3 were inversely related to total population abundance. Catchability coefficients in 144-mm-mesh gill nets were inversely related to estimated population sizes. An intrinsic mechanism of population regulation is proposed whereby recruitment is a function of parental stock size, juvenile survival is inversely related to stock size, and growth is inversely correlated with population abundance.

The Prevalence of Schizophrenia in a Remote Area of Botswana

1986 ◽  
Vol 148 (5) ◽  
pp. 576-580 ◽  
Author(s):  
David I. Ben-Tovim ◽  
Josephine M. Cushnie
Keyword(s):  
Remote Area ◽  
Population Estimates ◽  
Age Limit ◽  
One Year ◽  
The One ◽  
Village Life

We ascertained the one-year prevalence of schizophrenia amongst individuals aged 15 years or older living in six villages in a remote area of Botswana. All cases were diagnosed independently by two experienced psychiatrists, following ICD9 rubrics. DSM-III criteria were also applied, separately. Accurate contemporary population estimates of the villages were available. The age-adjusted prevalence of schizophrenia was 5⋅3 per 1000 in terms of ICD9, or 4.3 per 1000 by DSM-III, which has an upper age limit for onset of 45 years. These figures are well within the range generally reported for industrial communities. Remote village life in Botswana appears to offer no protection against the development of schizophrenia.

Analysis of Seasonal Distribution Patterns of Young Largemouth Bass (Micropterus salmoides) by Use of Frequency-of-Capture Data

1976 ◽  
Vol 33 (11) ◽  
pp. 2427-2432 ◽  
Author(s):  
Michael J. Van Den Avyle
Keyword(s):  
Largemouth Bass ◽  
Micropterus Salmoides ◽  
Distribution Patterns ◽  
Seasonal Distribution ◽  
Population Estimates ◽  
Bivariate Model ◽  
Animal Populations ◽  
Terrestrial Animal ◽  
And Migration ◽  
One Year

Frequency-of-capture data indicated that behavioral patterns of tagged age II largemouth bass (Micropterus salmoides) influenced catchability with shoreline electrofishing so that midsummer population estimates were too low. The population separated into offshore and shoreline groups during the summer, and there is evidence of persistence in habitat preference from one year to the next.Tests of catchability were based on the agreement between observed frequencies of capture and those predicted from a bivariate model that allowed mortality and migration during the study. Though frequency-of-capture data have been widely utilized in studies of terrestrial animal populations, this information has been generally ignored by fishery biologists.

scholarly journals Reproductive biology and feeding habits of the common dolphinfish Coryphaena hippurus (Linnaeus, 1758) off Saurashtra coast, India

2018 ◽  
Vol 65 (4) ◽  
Author(s):  
Jyoti Saroj ◽  
K. Mohammed Koya ◽  
K.L. Mathew ◽  
Panja Tehseen
Keyword(s):  
Reproductive Biology ◽  
Feeding Habits ◽  
Fork Length ◽  
Reproductive Activity ◽  
Monthly Basis ◽  
Coryphaena Hippurus ◽  
Saurashtra Coast ◽  
The Common ◽  
One Year ◽  
The One

The present study analysed reproductive biology and feeding habits of the common dolphinfish Corphaena hippurus, along the Saurashtra coast of India. The study is based on an investigation of 295 specimens caught using drift gillnet at Veraval. The samples were collected on a monthly basis between March 2015 and February 2016. The sex ratio was 1:1.75 with a significant dominance of females in the population. The size at maturity for females was 593 mm FL (fork length). Absolute fecundity of the individuals ranged from 1,07,813 to 15,50,400 having ova diameter range of 0.3-1.96 mm. C. hippurus spawned throughout the year with its reproductive activity peaking in April and December. Thus the dolphin fish has an extended spawning season; during which it laid eggs almost continuously. A total of 128 stomachs of C. hippurus, whose fork length FL ranged from 380 to 1250 mm were examined during the one year period of this study. Tunas were found to be the common dietary component of the dolphinfish.

Managing Centrarchid Fisheries in Rivers and Streams

2019 ◽  
Author(s):  
Mike Reed ◽  
A.J. Pratt
Keyword(s):  
High Growth ◽  
Smallmouth Bass ◽  
Population Characteristics ◽  
Natural Mortality ◽  
Micropterus Dolomieu ◽  
Return Rates ◽  
Rate Functions ◽  
One Year ◽  
Mean Time ◽  
Mortality Estimates

<em>Abstract.</em>—Angler harvest and population characteristics of Smallmouth Bass <em> Micropterus dolomieu </em>were assessed through electrofishing surveys and tagging 3,027 fish with reward tags at six sites on five Ozark streams. Growth, exploitation, and mortality were estimated for each site. Predicted population responses to higher length limits were simulated using Fishery Analysis and Modeling Simulator software. Tag return rates ranged between 37% and 64%, angler release rates ranged between 63% and 94%, and annual exploitation ranged between 5% and 26%. The median time at-large for tags returned within one year of tagging ranged from 22 to 47 d of the tagging date. Growth rates were relatively slow, as mean time to reach 305 mm was 4.9 years and mean time to reach 381 mm was 7.8 years. Total annual mortality estimates ranged from 37% to 55%. Annual natural mortality estimates ranged from 13% to 33%. Predicted responses to higher length limits varied considerably by site because of differences in estimated rate functions. Although simulations predicted small increases (0.54–2.73 fish/100 recruits >381 mm) in the number of larger fish with the 381-mm length limit at five of six sites, predicted increases were substantial (17 fish/100 recruits >381 mm) and yield increased 6% at the Current River-Powder Mill site. Individuals in the Current River-Powder Mill site were not reaching their full growth potential due to growth overfishing, while simulations of the remaining five populations indicated no growth overfishing under current conditions and regulations. The combined effects of natural mortality and slow growth limited the effectiveness of higher length limits. Under most conditions, the statewide length limit of 305 mm was adequate to balance the desire of quality fishing and harvest opportunities on most Ozark streams. Our study indicates that fisheries at select stream reaches may be improved by higher length limits where exploitation is high, growth is adequate, and natural mortality is low.

The Lake Trout of Lac la Ronge, Saskatchewan

1961 ◽  
Vol 18 (3) ◽  
pp. 423-462 ◽  
Author(s):  
D. S. Rawson
Keyword(s):  
Lake Trout ◽  
Average Rate ◽  
Fork Length ◽  
Commercial Catch ◽  
Average Growth ◽  
Main Lake ◽  
Spawning Run ◽  
C 50 ◽  
Average Size ◽  
Creel Census

The lake trout, Salvelinus namaycush, of Lac la Ronge was studied in the years 1948 to 1959 using gill netting, tagging, creel census and sampling of the spawning run. The trout spawned on shallow rocky reefs in the first week of October, when water temperatures were about 10 °C (50°F). Of the spawning run, 82% were from 7 to 12 years old. Possibly 10% of the mature trout failed to spawn in any single year.Growth rate varied widely in individuals and the average rate produced, at 10 years, a trout of 26 inches (66 cm) fork length and weighing 8 lb (3.6 0kg). No difference was found between growth rates of males and females and there was no change in average growth rate during the 10-year study. However, trout in the main lake grew considerably faster during their first 5 years than those in the deeper, colder Hunter Bay. Thirty-three trout weighing from 30 to 43 lb were examined.Ciscoes, whitefish, ninespine sticklebacks and other fish made up 90% of the food of adult trout. The crustaceans Mysis and Pontoporeia were eaten in moderate quantities, especially by trout in their third and fourth years. Two cestode parasites were found in the intestine and the larvae of a third in the muscle of trout.The trout were widely scattered from break-up of ice in mid-May to late June. As the upper water warmed above 10 °C (50°F) they moved down and were concentrated in areas deeper than 20 m (65 ft) during July and August. As the water cooled they again spread into shallow water about mid-September. Of 429 tagged, 60 or 14% were recovered during the first, second and third years after tagging. Recoveries showed extensive movement throughout the lake and a moderate exchange between the main lake and Hunter Bay.In standard gill-net catches plankton-feeding and bottom-feeding fish outweighed piscivores by 3 to 1 in the main lake and 1.8 to 1 in Hunter Bay. Catch data suggest that the trout population was greater in 1958–59 than in 1948–49. The average size of trout caught and the year-class composition were unchanged after 10 years.By diverting commercial fishing from trout to whitefish the average commercial catch in the 10-year period has been maintained at 250,000 lb per year, as compared to 316,000 lb in the previous 30 years. The anglers' catch of trout now averages 30,000 lb per year and this could be doubled without exceeding the known capacity of the lake for trout production. The creel census shows no decrease in average size of trout caught, average catch per angler, and number of very large trout taken.

Lake Opeongo: Effects of Exploitation and Introductions on the Salmonid Community

1972 ◽  
Vol 29 (6) ◽  
pp. 795-805 ◽  
Author(s):  
N. V. Martin ◽  
F. E. J. Fry
Keyword(s):  
Growth Rate ◽  
Mortality Rate ◽  
Lake Trout ◽  
Total Mortality ◽  
Smallmouth Bass ◽  
Fishing Pressure ◽  
Sport Fishery ◽  
Trout Population ◽  
Lake Waters

Lake Opeongo, a 58.6 km2 lake in the highlands of Algonquin Park, Ontario, has been under study since 1936. Due to little human development of the area, environmental conditions have been stable but because of its geological setting and location the lake waters are relatively unproductive.The smallmouth bass introduced in 1928 has had no apparent major impact on the salmonid community but has served to buffer fishing pressure on the lake trout. The cisco introduction in 1948 resulted in faster growing, better conditioned, and more fecund lake trout but has also contributed to their later maturity. Weight production of trout increased and in recent years stronger classes have apparently resulted from the improvement in fecundity. Declines in the perch and benthic insects and a decrease in growth rate of certain fishes since the mid-1950s are apparently related to the cisco introduction.Harvest of lake trout by the sport fishery has varied from 630 to 2700 fish/year representing a long term yield of 0.33 kilos/ha. Mean total mortality rate is 50%/year and exploitation has served to double the mortality rate after the trout have entered the fishery. Year-class production is correlated with spawning escapement and exploitation has limited recruitment to the trout population.

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