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Pre-Season Shrimp Tows, Portsmouth NH, January 15, 2013

Three shrimp trawlers from Maine (from South Bristol, Stonington, and Sebasco) and one from Portsmouth, New Hampshire made some experimental pre-season shrimp tows for one day during the week of January 13, 2013.  All data from the Portsmouth, NH trip are listed below.

The Portsmouth boat averaged 84 pounds of shrimp per hour.  Its best tow was 140 pounds per hour.  Depths ranged from 40 to 65 fathoms, with the highest catch rate at about 60 fa. (see tow 2 below).  Count per pound was consistently about 48.  Most female shrimp had hatched off their eggs, unusually early (see graph below).

Please select one of these links, or scroll down the page:

Chart of the Portsmouth fishing area

Size-sex-eggstage frequency graph
Note that 88% of female shrimp had hatched off their eggs (orange).

Graph of shrimp sizes by sex and egg stage

Portsmouth, NH Data for Each Tow, January 15, 2013
Date
Port
Boat Length (ft)
Area Towed
Tow
Latitude
Longitude
Depth (fath.)
Tow Minutes
Catch (lbs)
Lbs per Hour
Count per lb
Comments
Jan. 15
Portsmouth NH
55
1 start
end
43°07.445'
43°07.012'
70°22.545'
70°23.903'
54
50
30
60
120
47
"
"
"
2 start
end
43°06.931'
43°06.886'
70°21.883'
70°20.360'
56
62
30
70
140
49
"
"
"
3 start
end
43°03.938'
43°04.228'
70°30.021'
70°29.348'
40
42
17
20
71
49
Hauled back early due to gear conflict
"
"
"
4 start
end
43°03.203'
43°02.388'
70°20.871'
70°21.957'
66
65
30
3
5
na
No sample, dumped catch, mostly whiting, approx 2-3 pounds shrimp
           
Averages
54
27
38
84
48