Dougald & Ann Campbell emigrated to Canada from Islay between the birth of their first known child, Flora Campbell, on Sept 18 1831 and the birth of their second known child, Charles Campbell, in February 1834 in Ontario, Canada. I have not identified when, or how, they left Scotland. Oral family history indicates most of the passengers on the ship were from Islay including many Currie family members/relatives. The crossing took 90 days and a number of passengers, including 3 cousins, died en route.
Marriage Registration: Dougald Campbell & Anne Keith Nov 21 1829 @ Kilarow, Islay, Scotland
Dougald/Dugald Campbell was born in Scotland in 1805 and died in Collingwood, Ontario, Canada on Jan 11 1889. The death certificate indicates he was 83 years old. He was a tailor.
Oral family history indicate Dougald Campbell's mother was a Currie from the island of Islay. She met and married a Campbell from the mainland whose family owned the Campbell Paisley works from Paisley Scotland. "My" Dougald was a younger son in the family. He and a sister, Annie, came to Canada and settled in Duntroon, Ontario. Dougald's older brother(s) took over the family shawl making business. Two of Ann (Keith) Campbell's sisters also came to Canada. One settled in Angus. Ontario and the other, Catherine, married a widower farmer from near King, Ontario and raised his son and the son's son. Ann (Keith/McKeith) Campbell was reportedly a very beautiful woman and again, oral family history, reports she was the most beautiful young woman to go into Glasgow Kirk with beautiful skin and deep red hair.
Ann Keith/McKeith was born in Scotland between 1801 and 1813, depending on which Canadian Census record you believe. Canada Census reports 1851 age 30 (1821) name shown as Annette; 1861 age 60 (1801) name Mrs Campbell; 1871 age 58 (1813) name Ann; 1881 age 68 (1813) name Ann. Various Canadian legal documents indicate her name was Ann Keith including some of their children's marriage and death registrations. Court documents at Canada Land Titles indicate her name was Ann Campbell. I have been unable to find her death registration and the 1851 Census was obviously wrong about her age. She reportedly lived to be 99 years and 9 months old.
Both Ann & Dougald Campbell were illiterate and signed their names with an "X"
Ann's maiden name was "Keith" on the Nov 21 1829 marriage registry from Kildalton, Argyll, Scotland. Her maiden name is listed as "Mackeith" on the birth registry of their first child, Flora Campbell, in Octovullin, Bowmore or Kilarrow, Scotland on Sep 18 1831.
A Genealogist from the Isle of Islay was not able to add to the aforementioned info and indicated she has had no success at all in locating very early passenger lists - only the Ellis Island details from 1890's onwards. There is a web-site - The Ships List - which has some Canadian ship entries but it is just from the 1860's onwards.

THEIR CHILDREN:
Flora CAMPBELL.
1831 – 1909.
Married Thomas Stephens & lived in Collingwood, Ontario.

Charles CAMPBELL.
1833 – 1872.
Married Margaret ? and had one child. Died in the wreck of the Mary Ward.

Margaret CAMPBELL.
1836 – 1922
Married Alexander McArthur and lived in Chicago. On the 1920 Census (widow) living with her sister, Kate McBean (widow) in Chicago.

Hugh CAMPBELL.
1838 – 1918.
Married Eliza - marine engineer - lived in Collingwood area.

Mary CAMPBELL.
1841 – Jan 9 1929 in Chicago, Illinois.
Married Albert Henry Allen and lived in Chicago, Illinois

George CAMPBELL.
1844 – 1917.
Married Flora Currie. Farmed in Collingwood area..

Catherine "Kate" CAMPBELL.
1844 – July 24 1923 in Chicago, Cook County, USA
Married George McBean and lived in Chicago, Illinios

John CAMPBELL.
1847 – 1908.
Married Mary Currie. Farmed in Collingwood area.

William Dougald Campbell.
1849 – 1905
Married Alice Osborne. Relocated to Saskatchewan to homestead and died shortly after the family arrived.

Sarah Ann CAMPBELL.
1850 – Oct 13 1914
Although she is shown on the 1851 Census (born 1850?) the date of birth on her death register is March 18 1852)
Married Marlow M Goodale May 16 1872 in Cook County, Illinois, USA. 3 children, one died in infancy, Lee at age 19 and Hattie (1878-1943) married Virgil Marrs on Sep 9 1903 in Chicago. They had 4 children and later moved to California
GRANDAUGHTER Jean (Marrs) Leffingwell

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1851 Census for Collingwood, Grey North, Ontario
Dougald Campbell 55
Annette Campbell ?? (presumably Ann)
Flora Campbell 20
Charles Campbell 18
Margaret Campbell 16
Hugh Campbell 12
Mary Campbell 10
Catherine Campbell 8
George Campbell 6
John Campbell 4
Dugald Campbell 3
Sarah Ann Campbell 2

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1861 Census for Collingwood, Grey North, Ontario
Dougald Campbell 60
Mrs Campbell 60 (born 1801?)
Charles Campbell 25
George Campbell 16
John Campbell 14
Dugald Campbell 12
Sarah Ann Campbell 10

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1871 Census for Collingwood, Grey North, Ontario
Dougald Campbell 65
Ann Campbell 58 (born 1813?)
George Campbell 25
Dugald Campbell 22

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1881 Census of Canada
Name Ann H. Cambell
Gender Female
Marital Status Married
Age 68
Birth Year 1813
Birthplace Scotland
Religion Presbyterian
Nationality English
Province Ontario
District Number 139
District Simcoe North
Sub-District Number A
Subdistrict Nottawasaga
Division 3
Household Members
Name Age
Dougal Cambell 74
Ann H. Cambell 68

NOTE - Their son John "John Close" CAMPBELL & family were living nearby in District Number 139, Simcoe North, Sub-District Number A, Nottawasaga in Division 2 with Flora's parents, Hugh & Mary Currie.