Observations on the Life History of the Hybrid between Eastern Brook Trout and Lake Trout in Algonquin Park, Ontario

1960 ◽  
Vol 17 (4) ◽  
pp. 541-551 ◽  
Author(s):  
N. V. Martin ◽  
N. S. Baldwin
Keyword(s):  
Life History ◽  
Brook Trout ◽  
Egg Production ◽  
Depth Distribution ◽  
Lake Trout ◽  
Trout Lake ◽  
Weight Relationship ◽  
History Of ◽  
Game Fish

Studies of brook trout × lake trout hybrids planted in Algonquin Park, Ontario lakes since 1954 indicate they are readily available to angling and an excellent game fish. Hybrid trout depth distribution during stratification is between the 8° and 20 °C isotherms. Mayfly nymphs, crayfish, leeches and fish are important in the diet. Hybrids average 12 inches at age II, 16 inches at age III, and 18 inches at age IV. Their length–weight relationship is similar to the lake trout. Most hybrids are mature by age III. Egg production is similar to the brook trout. Hybrids were observed spawning on rocky shoals in early November and had spawning characteristics of each parent. Hybrid trout eggs hatched by the end of April.

THE LIFE HISTORY OF THE CARROT WEEVIL, LISTRONOTUS OREGONENSIS (COLEOPTERA: CURCULIONIDAE) UNDER CONTROLLED CONDITIONS

1976 ◽  
Vol 108 (9) ◽  
pp. 931-934 ◽  
Author(s):  
P. Martel ◽  
H. J. Svec ◽  
C. R. Harris
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Larval Stage ◽  
Egg Production ◽  
Laboratory Studies ◽  
Preoviposition Period ◽  
Complete Life Cycle ◽  
History Of ◽  
Listronotus Oregonensis ◽  
Carrot Weevil

AbstractLaboratory studies on the biology of the carrot weevil, Listronotus oregonensis (LeConte), were performed at 21° and 27 °C. At 21 °C females laid eggs for 88 days on carrot slices and 94 days on foliage. Egg production per female averaged 156 and 175 on slices and leaves respectively. Eggs hatched after 8.3 days incubation and the larval stage comprising four instars was completed in 19.1 days. The prepupal and pupal stages lasted 3.7 and 9.4 days respectively. The complete life cycle including an average preoviposition period of 17 days was 57.6 days. Development was more rapid at 27 °C, with the complete life cycle taking only 37 days.

Studies on the life history of some species of Protocalliphora (Diptera: Calliphoridae)

1991 ◽  
Vol 69 (8) ◽  
pp. 2048-2058 ◽  
Author(s):  
Gordon F. Bennett ◽  
Terry L. Whitworth
Keyword(s):  
Life History ◽  
Low Temperatures ◽  
Field Trial ◽  
Egg Production ◽  
Threshold Temperature ◽  
Rate Of Development ◽  
Threshold Temperatures ◽  
In Captivity ◽  
History Of ◽  
Single Field

The rate of development of the larvae, postfeeding larvae, puparia, and adults of 10 species of Protocalliphora were studied and differences noted in the rates of development and (or) survival. Larvae of Protocalliphora were photonegative and strongly influenced by thigmotactic stimuli. The method of feeding of the larva is described. Metamorphosis was completed more quickly at higher temperatures than at lower temperatures. Survival of purparia at temperatures of 7 °C or lower was poor and indicated that this stage was not adapted to withstand low temperatures and probably did not survive the winter. Adult Protocalliphora females were longer lived than males, surviving for an average of 70–100 days, with some individuals surviving for over 250 days under laboratory conditions. Adults fed readily on a sugar–protein diet, crushed berries, and certain species of flowers, but most species did not feed on any form of carrion. Adults mated readily in captivity, but none of the seven species tested crossbred. Spermatozoa remained motile in the seminal receptacles for over 100 days. Eggs were laid on a few occasions, but the factors determining egg production were not studied. Adult Protocalliphora were strongly photopositive and became quiescent in the dark. Adult flies rarely became active until a threshold temperature of 15.5 °C; different species had differing threshold temperatures. Adults successfully overwintered in a single field trial.

Genetic Differences in Retention of Swimbladder Gas Between Two Populations of Lake Trout (Salvelinus namaycush)

1974 ◽  
Vol 31 (8) ◽  
pp. 1351-1354 ◽  
Author(s):  
P. Ihssen ◽  
J. S. Tait
Keyword(s):  
Brook Trout ◽  
Depth Distribution ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Genetic Differences ◽  
Trout Population ◽  
Two Populations

Lake trout (Salvelinus namaycush) derived from two populations differed in retention of swimbladder gas. The two reciprocal interpopulation crosses were intermediate to the parent populations. The two F1 hybrids obtained by crossing fish from each lake trout population with brook trout (S. fontinalis) were also found different in retention. Gas retention was correlated with depth distribution of the parent populations, high retention being associated with deeper distribution.

Life History of Sea-Running Brook Trout (Salvelinus fontinalis) of Moser River, N.S.

1940 ◽  
Vol 5a (2) ◽  
pp. 176-186 ◽  
Author(s):  
H. C. White
Keyword(s):  
Life History ◽  
Fresh Water ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Large Fish ◽  
History Of

Smolts, kelts and non-mature large fish descend in May and early June to the sea, to remain feeding in the estuary or near the shore. They began (1939) to ascend the river in late June, and 93% of the "run" was in July.Fish marked when descending one branch of the river ascended both that branch and the river above but the proportion of marked fish was greater in the branch.These trout agree with the local salmon in having smolts that become silvery before migration and that are two or three years old. Trout smolts and kelts remain in the sea only about two months before returning to fresh water.

Ecology and Life History of Coaster Brook Trout and Potential Bottlenecks in Their Rehabilitation

2008 ◽  
Vol 28 (4) ◽  
pp. 1321-1342 ◽  
Author(s):  
Casey J. Huckins ◽  
Edward A. Baker ◽  
Kurt D. Fausch ◽  
Jill B. K. Leonard
Keyword(s):  
Life History ◽  
Brook Trout ◽  
History Of ◽  
Coaster Brook Trout
Sign in / Sign up

Export Citation Format

Share Document