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01234567891011121314151617181920212223242526272829 CM
ödsmål, Kville sn, Bohuslän Hällristning
Fiskare från bronsåldern
Rock carving Bronze age fishermen
■V^eribiblio^
Hydrografiska avdelningen, Göteborg
DATA OP MEASUREMENTS II THE HANÖ BIGHT AUGUST - SEPTEMBER 1971 AMD MARCH 1973
(S/Y eystrasalt)
oj
Earl Erik Berntsson and Artur Svansson
November 1973
/
DATA OF MEASUREMENTS IN THE HANÖ BIGHT AUGUST - SEPTEMBER 1971 AND MARCH 1973
(r/y eystrasalt) by
Karl Erik Berntason and Artur Svansson CONTENTS
Introduction, methods Discussion
References
Station Map, Pig. 1 1971
Maps showing the distribution of
a) Temperature at 8 m depth, Pig. 2 b) Salinity at the surface, Pig. 3
o) Total phosphorus at the surface, Fig. 4 d) .Phytoplankton biomass at the surface, Pig. 5 e) Yellow substance at the surface, Pig. 6 Table 1 a-d, Surface data
" 2 a-c, Bathythermograph data H 3f Series station 56
” 4, " " 21
» 5, " M 0
<s 6, " ,s 54
» 71 » » 42
” 8 a-g, Phytoplankton species
if 9, n !t as biomass
M 10 a-b, Zooplankton species 1973
Maps showing the distribution of
a) Salinity at the surface, Pig. 7
b) Total phosphorus at the surface, Pig, c) Attenuation, RG 1 at 2 m depth, Fig.
d) Yellow substance at the surface, Pig, Table 1 a-c, Surface data
2, Series station 0
3, » l! 30
4, " » 21 5, I( " 40 B
6, » 54
7 a-c, Attenuation RG 1 8, Zooplankton species
8 9
10
Pages 1-3
3 4 5
6
7 8 9 10 11-14 15-17
18 19 20 21 22 23-29
30 31-32
33 34 35 36 37-39
40 41 42 43 44 45-47
48
1
INTRODUCTION, METHODS
During the late summer of 1969 and 1970 hydrographical and biological measurements were carried out in the Hand Bight in order to possibly shed some light on the problem of a decline in the eel fishing between the two arms of the Helgeå river outlet into the bight* The results were published in Meddelande från. Havsfiskelaboratoriet no 97 and 103«
During the periods August 30 ~ September 2, 1971 and March 12-15
1973 new observations were made. These times mostly surface measurements were carried out and thereby more stations could be visited.
The methods used for-the parameters measured in 1971 and 1973 are listed below.
Temperature was read in a bucket with an ordinary thermometer of 0.1 °G accuracy and also from reversing thermometers at standard depths.
Salinity was determined with a laboratory salinoxaeter* type Hyteeh, Bisset-Berman and in situ salinometer type MIO at some depths.
Oxygen (0,.,) was determined according to Winkler.
BST (e.g. BOB?), the biochemical oxygen, demand was determined on almost all stations as the difference between oxygen determined immediately and after one week of dark storage.
KMnO^ - Consumption(ae.g. COD), the chemical oxygen demand was deter
mined in an alcaline, medium by the Nymö11a Pulp Industry.
Phosphate -Phosphorus (PO -p) was determined at all stations according to Murphy and Riley.
Total Phosphorus (Tot.P) was determined in the laboratory according to Koroleff (1970),
Colour (Färg) was determined by the Bymölla pulp Industry. The method used is published in "Standard Methods for the Examination of Water, Sewage and Industrial Wastes'*. American Public Helth Assosiation, Inc.
2
Secohi disc» The depth for the disappearance of a white-painted disc of 30 cm diameter was noted. No water telescope was used»
Attenuation (BO) was measured by a one-meter in situ beam transmittance meter and only with red filter,, Rff1. The intensity u was determined by a Speedomax current recorder with the measuring unit in situ and u with the measuring unit in air in a darkroom. For the red filter
s*
RGrl (655 nia) the transmittance = 0.48 u /u was computed. The
iw «i W H ^
attenuation coefficients listed (RG m ) represent •»''log T,
Yellow Substance (Absorption.) in the wavelength of 380 nm of filtered (through a 0.6 umillipore filter) sample in 5 cm cuvette. This was done a few weeks afterwards. From the absorption in 300 run was'com
puted
"1380
Â380 x 20
'.TÖ“.
log e This is the method by Jerlov (1355).
Bathythermographs measurements were made at every station. Photographs of all slides are stored at the Hydrographic Department of The Fishery Board.
Phytoplankton Species were identified and counted by Ruth Hobro, Stockholm,» in 100 ml samples drawn from the ordinary water sample.
The samples from 1973 are not yet counted,
Zooplankton, Species were- identified and counted by Roger Lindblom, Göteborg (1971) and Lars Heraroth, Lysekil (1373)® Sampling was made with a conical plankton net, with a diameter of 1 ra (197') and 0*5 a
(1973). Most hauls were made from 5 m to surface,
Determination differed somewhat 1971 and 1973 1971s
To each sample water was added to a total volume of 1000 cc, A sub- sample of 20 cc was drawn twice» and the animals counted* The figures obtained were thus multiplied by a factor of 50 to represent.the ■ entire sample* The table shows the mean number of the two sub-samples for each species,
1973.
From each sample a sub-sample was taken and counted in a counting- chamber.
3.
Species occurence, (1973) 0 = no specimens in the sample
1 S3 few specimens in the sample, about 1.5 % of the total number of specimens
2 = less abundant, about 6 - 25 % of the total number of specimens 3 = abundant, about 26 » 50 % of the total number of specimens 4 = very abundant, more than 50 % of the total number of specimens lote: In samples where the total sum of individuals was low, the species most abundant was not ,given figure 4 but instead figure 3, even if comprising more than 50 % of the sample. This way a more accurate comparison between the different samples was obtained.
Discussion.
710850 - 710902: The weather conditions were similar to those in 1969 and 1970; Winds from S - SI and rather strong upwelling along the coast* At the tube exit (Stn. 0) the yellow substance values only slightly above the Baltic background values, but they were considerable in Saxaviken and the Bay of Sölvesborg (Stations no 54» 57 and 58). Total phosphorus was high in the Bay of Sölvesborg and. in Ihue Harbor. Permanganate was for the first time measured by the correct alkaline method. Whereas the open, sea values were around
15 mg/1, at more than half of the stations there were values of 20 - 23 mg/1.
7303.12 ~ 750315; This time the wind situation was different; I'E winds prevailed during the measurements but there had apparently been an upwelling situation right before, if we judge from the high salinities along the coast. Nevertheless the yellow substance values are high, at station 0 doubled in relation to background«
4
References;
Ackefors, H. and Heraroth, L# , 1972; Zooplanktonfaunan i Östersjöom
rådet* Meddelande från Havsfiskelab,» Io, 131* -(Mime o) Berntsaon, K.-E. and Svansson, A., 1971; Bata of measurements in the
Hanö Bight August-Sept, 1969 (e/V Bystrasait) Medd.
fr, Havsfiskelab, Ho. 97,
Berntsson, IC.-E. and Svansson, A,, 1971 : Bata of measurements in the Hanö Bight August-September 1970, (s/V Eysträsalt). Medd.
fr, Havsfiskelab, So, 103.
Bladh, J.-O,, 1972; Measurements of Yellow Substance in the Baltic and neighbouring Seas Baring 1970-1972« Medd, fr, Havs
fiskelab. No. 138,
Carlberg, S.B., 1972; A study of the distribution of organic carbon and oxidability in Baltic Waters, Medd, fr* Havsfiskelab.
No, 141.
Carlberg, S.R., 1972: New Baltic Manual. ICES, Cooperative Research Report, Ser. A. No. 29,
Jerlov, I.6-«, 1955: .Factors influencing the transparency of the Baltic maters. Medd. fr, Oceanogr. Inst, Göteborg Nr. 25.
Koroleff, 3?., 1970: Determination, of total phosphorus in natural waters by means of per sulphate oxidation« ICES, Information on techniques and methods for sea water analysis, No. 3.
5
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