Inter natio nal ConmUsaion for
a
NOT TO BE CITED WITHOUT PRIOR
REFERENCE TO THE AUTHOR(S)
the Northwest Atlantic Fisheries
Seria l No. 5265
ICNAF Res.Doc. 78/VI /78
ANNUAL MEETING - JUNE 1978
GDR resul ts of the juven ile herrin g survey s in ICNAF
Div. 4X, 5Y, 5Z and Stati stica l Area 6A in the
spring of 1975, 1976 and 1977
(herri ng and mackerel)
by
N. Schul tz
Instit ute for Deep Sea Fishe ries and Fish Proce ssing
Rostock-Marienehe, German Democratic Repub lic
Intro duct. ion
GDR took part in the Juve nile Herr ing Surve y with R/V
"Ern st Haec kel"
in 1975 (Peb r. 26-M arch 1-;) and 1976 (March 2-l\Ia rch 18)
and with ROS
224 "Gor li tz" in 1977 (March 3-Ap ril 7).
In the perio d from 26 Febru ary to 10 March 1975 the inve
stiga tions
were done accor dine: to an own progr amme .
ROS 224 "Gor li tz" was chart ered from the VEE
the inve stiga tions in 1977 .
~'ischkombinat
Rosto ck for
Methods and mode of work
Durin g surve y 1975 66 fishi ng stati ons (Fig. 1) were work
ed. All stati one
were fishe d with the herri ng botto m traw l HG 692. T-S
meas urem ents at
each fishi ng stati on and two addi tiona l hydro graph Jc stati
ons were done .
In 1976 46 Hshi ng stati ons (HG 692 and HG 490) and 2.:>
p.Lan LWlJ dtatio ns
all,e xcep t of 4, with T-S meas urem ents were work ed (Fig.
2). Besid es
T-S meas urem ents only were taken on three addi tiona l stati
ons.
In 1977 110 fishi ng stati ons (HG 600) and 109 plan kton
stati ons were
work ed (107 stati ons with temp eratu re meas urem ents, Fig.
3). Golf of
Jiiaine stati ons were fishe d with rolle rs becau se of rough
botto m.
All plank ton samp les (1976 and 1977 ) were given to the
NEFC, Woods
Hole .
A2
- 2 -
For temperature and salinity measurements Nansen bottles were
used. SUrface and bottom water temperature and salini ty isograIr~
are plotted in Figures 10-19.
Normally 3D-minute tows were made except for stations of own programme in 1975 (1-hour-tows).
The numbers csught per 1-hour-tow during own programme in 1975
were divided by 2 to convert them into 3D-minutes tow numbers.
Then they were used to calculate stratified mean numbers and
weights per tow.
The stratified mean number or weight per tow was calculated in
the following way (Grosslein 1971):
n
'\
1-
Yj =
t2=1
log (C ij +1)
e
n
Y. ••• Mean value
J
per stratum
C • • • • Catch in number
or weightper tow
n
Number tows per
stratum
·...
k
2.
Yst
~ Aj
• Yj
A • ••• Area of a stratum
a-k • ••• Indexes of fished
strata
= ,j=a
k
I~>
j=a
Yst ··· Stratified mean
number or weight
per tow
Usually all fish and most invertebrate species were measured
in length and weight.
Herring were measured to em below total length in 1975 and to
half em below total length in 1976 and 1977 (then measurements
were grouped to em below) and mackerel to em below fork length.
For aging otoliths were taken.
A3
- 3 Results
Herring
The numbers of herring caught and the mean lengths are shown in
Table 1. The relative high total catch in 1977 originated only on
one tow with a catch of 4960 specimens, in the remaining 109 tows
the herring catch amounted only to 340 specimens.
A review over the catch distributions is given in Figures 4-6.
The largest herring catches (> 1,000/tow) were done within a range
of bottom water temperatures from 4,9 to 5,2 °c in 1975 and at
1,2 °c in 1977 (1976 - no catches over 1,000 specimens per tow).
The total ranges in which herring was caught were 3,4-9,8 °c in
1975, 4,0-8,4 °c in 1976 and 1,2-7,2 °c in 1977.
In length distribution the subsequent length groups were prediminant:
1975
1976
1977
10-12 cm (4X) and 28-30 cm
22-25 em
and 30-31 cm
26-28 em
In 1975 the 70, in 1976 the 73 and 70 and in 1977 the 73 year classes
were predominant in the catches.
A review over the ascertained mean weights per length group eives
the Tables 12-14.
The values for the stratified mean weight (all AGs) per tow for
strata 1-25 were only 40 % in 1976 resp. 14 % in 1977 of that of
1975 (Table 16). This continous decrease was-characteristic for
the trend in the stock development.
The stratified mean number per tow for AG 3 compared with 1975
value were 113 ;~ in 1976 (year class 1973) and 27 ~0 in 1977. The
catch of juvenile herring (AG 2) was very low in all three years
(Table 2). An estimation of the stock size of AG 2 herring is not
possible on the basis of the low catch data.
A4
- 4 -
Mackerel
In the division 4X, 5Y and Stat. Area 6 A no mackerel were
caught in all three years.
The caught numbers of mackarel in Division 5 Z and the mean
lengthes are shown in Table 1. The great number of mackerel
caught in 1976 bases on one tow with 32.390 specimens at the
south east slope of Georges Bank. The Figures 7-9 show the
catch distributions of mackerel.
The largest mackerel catches (> 1,000/tow) were done within
a range of bottom water temperature from 5,0-6,2 °c in 1975
and from 6,5-8,4 °c in 1976 (1977 - no catches over 1,000
specimens per tow). The total ranges in which mackerel was
caught were 4,3-10,5 °c in 1975, 5,1-12,6 °c in 1976 and 5,411,2 °c in 1977.
Subsequent length groups were predominant.
1975
1976
1977
16-17 cm and 24-26 cm
16-20 cm
25-27 em
In 1975 the year class 1973 and in both subsequent years the
year class 1975 were predominant (Tables 9-11).
A review over the ascertained mean weights gives Table 15,
The computed stratified mean number (AG 1+AG 2) and weight (all AGs)
per tow for strata 1-25 declined from year to year (Table 17).
Summary
- In spring 1975, 1976 and 1977 GDR took part with R/V "Ernst
Hae ckel" and ROS 224 "Gi:irli tz" in the Juvenile Herring Survey.;;
and worked in the ICNAF-divisions 4X, 5Y, 5Z and Stat. Area 6 A.
- The catch of juvenile herring was very low. The st~atified mean
number (AG2 + AG 3) and weight (all AGs) per tow for herring
declined since 1975. An exception represent the AG 2 and AG3
in 1976 where 'herring of AG 2 was not caught and the AG3 was
AS
- 5 caught in relative abundance. The year classes 1970 and 1973 were
predominant.
- The stratified mean number (AG 1 + AG 2) and weight(all AGs) per
tow for mackerel declined from year to year. In 1977 juvenile
mackerel was not caught. In age distribution the year-class 1973
in 1975 and the year class 1975 in both subsequent years were
predominant.
Literature cited
Grosslein, iIl.D. 1971
Some Observations on Accuracy of Abundance
Indices Derived from Research Vessel Surveys
Int. Corom. Northw. Atlant. Fish., Res. Doc.
71/59 27 pp.
A6
- 6 Table 1
Year
Number of stations, catches anu mean lengthes
of herring and mackerel by GDR from the Juvenile
Herring Surveys in 1975, 1976 and 1977
Mackerel
Herrin~
Division No. of
Catch meanen~tb Catcb mean lengtb
stations (No.) (L t , em
(No.) (L f • em)
1975
1976
1977
4 X
5 Y
5 z
1
8
57
1226
49
4763
29,48
23020
22,87
4 X
5 Y
5 z
3
7
36
77
700
517
24,21
28,40
25,77
37448
18,94
4 X
5 Y
5 z
6 A
1
13
93
3
3
5275
22
27,50
183
27,46
11,60
Table 2: Catches of juvenile herring (AG 2, number) and
mackerel (AG 1, number) by GDR from Juvenile
Herrinc Surveys in 1975, 1976 and 1977
Division
6 A
s12ecies
4 X
5 Y
5 Z
:lear
berring
mackerel
1975
1976
1977
1975
1976
1977
1226
1
2
2
A7
2
1
7795
35575
no fishery
no fishery
no fishery
no fishery
- 7 -
Table 3:
Lt (cm)
9
10
11
12
13
14
15
Totals
The 1975 berrine; age-length key by GDR from the
Juvenile Herring Survey in Division 4 X
Year class
1973
aged
length composition
(%0)
4
32
13
1
4
32
13
1
7
200
543
190
40
13
7
50
50
1000
Number of age samples
Number of lengtb s'amples
Number of fish measured
: 1
: 1
:300
AS
- 8 _
Table 4:
The 1975 herring age-length key by GDR from the
Juvenile Herring Survey in Division 5 Z
Year class
Lt(cm)
1972
13
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
2
7
11
9
4
1971
1970
1969 1968 1967
aged
2
3
6
20
19
11
2
2
15
112
209
177
53
8
1
2
4
7
4
5
1
7
11
12
12
36
133
224
186
57
14
3
1
2
1
Totals
33
61
24
576
Number of age samples
Number of length samples :
Number of fish measured
3
1
7
30
4~34
age composition
age
2
3
4
%0
+
42
83
5
6
7
8
836
34
4
+
A9
698
lengtb com 0sition (%0
2
+
+
1
3
7
15
15
16
50
175
337
273
88
18
3
1
+
- 9 Table
2:
Lt (em)
Th.e 1976 herring age-length key by GOO from
the Juvenile Herring Survey in Division 4 X
1974
1973
Year class
1972
1971
1970
aged
length
comlosition
(%0
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
Totals
1
1
13
1
1
13
2
5
9
6
7
2
1
1
1
2
5
9
7
7
2
2
1
52
65
247
117
156
39
26
13
3
3
2
4
4
78
52
65
52
50
1001
1
2
4
4
10
6
33
Number of age samples : 1
Number of length samples: 1
Number of fish. measured : 77
age composition
%0
2
3
13
688
4
130
5
6
A 10
13
- 10 The 1976 herring age-length key by GDR from the
Juvenile Herring Survey in Division 5 Y
Table 6:
Year class
Lt (em)
1973
14
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
1972
1971
1970
1968
1969
aged length
composition (2§o~
1966
2
1
2
1
1
2
8
17
27
27
8
8
6
7
19
34
23
3
1
2
1
193
8
17
26
25
5
4
1
2
3
4
4
2
5
6
4
1
1
2
1
totals
88
19
17
12
30
20
1
2
1
1
1
63
1
4
Number of age samples
: 4
Number of length samples: 4
Number of fish measured :700
a6 e com[1osition
age
%0
2
3
3
376
4
84
5
131
6
389
All
7
13
8
~.
~
9
10
1
1
1
14
49
65
109
110
30
39
27
56
157
215
94
17
10
3
999
_ 11 Table 7:
The 1976 age-length key by GDR from the
Juvenile Herring Survey in Division 5 Z
Year class
1973, 1972, 1971, 1970, 1969, 1968 aged length com:position
(%0)
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
totals
1
1
21
63
77
42
18
7
230
1
1
2
5
5
1
2
4
12
10
2
15
30
2
10
25
22
6
1
1
66
2
1
1
1
1
1
21
63
77
43
19
9
5
7
7
22
35
25
4
4
72
2
203
227
120
44
22
14
18
14
64
98
72
21
6
344
1003
7
=============================================================
Number of age samples: 11
Number of length sampleso 16
Number of fish measured :517
s,ge composition
age
3
4
685
%0
39
5
6
7
8
77
188
8
4
A 12
_ 12 _
Table 8:
Lt(cm)
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Totals
The 1977 herring age - length key by GDR
from the Juvenile Herring Survey in Division 5 Z
1974
Year class
1973 1972 1971
1970
agFd length
composition (%0)
+
1
2
2
1
+
1
2
1
1
2
1
+
2
2
1
6
10
31
24
7
1
2
8
11
2
4
11
5
31
26
11
5
26
12
15
23
10
1
17
46
35
10
1
1
5
6
16
24
46
148
252
220
85
43
59
65
29
2
+
12
79
22
43
49
Number of age samples
: 5
Number of length samples :10
Number of fish measured :650
age composition:
2
age
3
4
68 686
%0
+
5
84
6
68
A 13
7
93
205
1001
- 13 The 1975 mackerel age - length key by GDR
from the Juvenile Herring Surveys in
Division 5 Z
Year class
Table 9:
Lf(cm)
1974 1973
1972 1971 1970 1969 1968 196'{ aged
_.4 ...
14
15
16
17
18
19
20
21
22
23
24
25
26
,.
1
1
1
1
2
2
2
4
27
52
,,,
1
4
27
52
31
-28.
')7
-
1
(I
~
1
29
30
31
32
33
34
35
36
37
38
39
40
~-
9
1
2
2
4
2
2
4
2
totals
5
127
3
1
2
4
3
1
2
1
3
3
3
3
1
148
age composition
%0
1
2
J
4
2
6
7
8
9
338
650
8
2
+
1
1
+
+
A 14
+
37
114
106
48
19
5
5
7
29
155
269
1""
42
24
6
4
2
+
1
-.
+
1
1
: 3
Number of age samples
Number of length samples : 36
Number of fish measured: 3218
age
lenGth
composi__tjo.n .(%.0)
1
+
+
+
+
+
1001
- 14 -
Table 10:
The 1976 mackerel age - length key by GDR
froD! the Juvenile Herring Survey in
Division 5 Z
Year class
Lf(cm)
1975
1974
1973 1972 1971 1970 1969 1968
aged length
composition
(%0)
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
1
t
1
1
6
16
22
9
5
2
1
1
1
6
16
23
9
6
6
26
31
10
6
2
5
8
11
10
5
6
6
3
4
2
1
...
1
4
25
31
10
6
2
3
3
2
5
11
8
1
1
2
4
4
1
1
2
1
2
3't
3
38
39
totals
64
86
28
11
5
3
Number of age samples:
5
Number of length samples: 16
Number of fish measured:1127
age comEosition
age
%0
1
950
2
48
3
1
4
1
6
+
5
+
B1
7
+
8
+
1
2
2
1
1
7
1
1
2
84
133
155
143
186
166
73
14
8
12
9
10
2
+
+
+
+
+
+
+
+
+
+
+
+
997
- 15 The 1977 mackerel age-length key by GDR from
the Juvenile Herring Survey in Division 5 Z
Year class
length
aged
Lf(Om) 1975 1974 1973 i97~ 197; 1970 1969
com1osition
Table 11:
(%0
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
5
5
3
2
28
32
15
10
1
3
3
2
3
1
1
3
2
28
32
16
13
2
1
1
1
1
1
1
3
2
3
4
2
1
3
3
2
1
1
2
1
<;
~
Totals 90
14
5
2
5
1
117
Number of age samples:
2
Number of length samples: 14
Number of fish measured: 183
aBe com]2osition
age
2
3
%0
5
38
49
235
246
120
93
44
16
27
33
16
11
16
16
11
776
131
4
5
44
27
6
11
82
7
8
11
996
.
5
- 16 -
Table 12:
The 1975 herring length-weight relation by GDR
from the Juvenile Herring Survey in Division
4 X and 5 Z
Division
4 X
:2 z
mean
mean
No.
Lt(cm) weight(g) weighed weight(g)
10
11
12
13
21
22
23
24
25
26
27
28
29
30
31
32
33
34
totals
No. of
weight
samples
6,0
10,0
11,0
14,2
9,9
20
20
20
12
72
No.
weighed
68,3
81,4
90,8
104,2
119,4
133,1
146,2
169,7
186,0
203,2
221,0
249,4
263,3
266,7
3
7
13
36
44
31
91
197
220
220
179
51
183,8
1104
1
9
3
11
83
- 17 Table
1~:
Division
Lt(cm)
14
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
totals
The 1976 herring length-weight relation by GDR
from the Juvenile Herring Survey in Division
4 X, 5 Y and 5 Z
4 X
mean
No.
weight(g) weighed
20,0
45,0
1
1
57,5
74,0
81,7
99,0
102,8
102,5
135,0
155,0
2
5
9
7
7
2
2
1
203,3
212,5
237,5
245,0
3
2
4
4
121,8
No. of weight
samples
50
5 Y
mean
No.
weight(g) weighed
65,0
50,0
72,5
77,4
87,3
96,7
111,3
117,6
127,2
163,3
175,3
193,7
206,1
218,6
231,2
263,6
260,0
1
1
8
21
26
47
49
16
15
33
103
136
59
12
7
2
167,9
553
17
2
1
84
5 Z
mean
No.
weight (g) weighed
65,0
72,5
82,7
94,8
107,5
119,5
142,0
153,8
185,0
193,3
210,0
220,0
240,0
1
2
15
22
16
11
5
4
2
3
2
4
2
280,0
1
118,1
90
3
- 18 -
Table 14:
Lt (em)
The 1977 herring length-weight relation
by GDR from the Juvenile Herring SUrvey
in Division 5 Z
mean
No.
weight (g)
weighed
30,0
32,5
1
2
70,0
50,0
75,0
1
2
1
86,7
102,8
114,4
136,3
148,7
155,6
193,0
209,7
227,0
232,9
3
9
9
27
23
9
15
30
23
7
16'7, 3
162
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
Totals
No. of weight
samples
4
85
- 19 Table 15:
Yea.r
D2. v} sian
Lf(cm)
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
totals
No. of
weight
samples
The 1975, 1976 and 1977 mackerel length.-weight
relation by GDR from the Juvenile Herr.i.ng
Survey in Division 5 Z
1976
1975
1977
5 Z
5 Z
5 Z
mean
mean
No.
mean
No.
No.
weight(g) weighed weight(g) weighed weight(g) weighed
31,3
25,5
36,2
42,1
51,1
57,9
72,5
80,0
102,2
120,5
134,1
147,9
166,8
189,1
219,1
231,1
250,0
290,0
4
108
204
174
114
72
40
20
36
62
81
82
76
63
22
9
10
1
362,5
4
560,0
1
86,7
1183
13,0
25,6
30,9
38,8
47,4
56,5
67,3
72,6
92,6
103,1
120,5
129,5
149,7
161,0
191,7
220,0
236,2
275,0
304,0
342,0
360,0
430,0
460,0
468,0
605,0
620,0
1
44
67
85
90
166
171
87
23
21
33
33
19
10
3
5
8
10
10
5
6
6
3
5
2
1
83,5
914
6
8
86
116,7
136,7
135,6
160,0
180,0
204,3
236,7
305,0
283,3
320,0
365,0
480,0
466,7
463,3
545,0
3
3
27
31
16
14
3
2
3
4
2
1
3
3
2
202,2 117
2
- 20 Table 16:
The stratified mean number and weight per tow
(Strata 1-25) for herring by GDR from the
Juvenile Herring Surveys in 1975, 1976 and 1977
Year
1975
1976
1977
wei~t
Table 17:
The stratified mean number and weight per tow
(Strata 1-25) for mackerel by GDR from the
Juvenile Herring Surveys in 1975, 1976 and 1977
weight
age 1 ~No. 2
age 2~No.2
1,086
1,158
1,439
0,569
0,823
0,594
0,161
0,000
0,187
Year
1975
1976
1977
1,382
.0,549
0,194
age 2 {No.2
0,014
0,000
0,008
87
age ~ {No E )
0,789
0,894
0,210
- 21 -
r--------- ---.----- -.. .----.I
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I Juvenile Herring Survey 1975
I February 26 - March 17
CJO
~ Bottom Temperature ~C)
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(
Fig.IO
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February 26 -March 17
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GDR R/V Ernst Hapck.1
Juvenile Hflrring
Survey 1975
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3 5
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Fig 73
GDR R/V Ernst Hapckel
Juvenile Herring
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3~5
February 26-March 77
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