NOT TO BE CITED WITHOUT PRIOR REFERENCE TO THE AUTHOR(S)
Northwest Atlantic Fisheries Organization
Serial No. N564 NAFO SCR Doc. 82/VI/71
SCIENTIFIC Ca NCIL MEETING - JUNE 1982
DISTRIBUTION OF THREE SPEC ES OF EELPOUT IN NEWFOUNDLAND DIVISIONS IN RELATION TH DEPTHS AND BOTTOM TEMPERATURES
by G.N. Morosova PINRO,M rmansk, USSR
Abstract This paper deals with istribution of Arctic eelpout (Lycodes reticulatus), patterned ee pout (Lycodes esmarki) and Vahl s eel- pout (Lycodes vahlii) in D . visions of Newfoundland and South Labra- dor. A regularity in distri ution of eelpouts by depths depending on bottom temperatures is det rmined. It is found that cold-water Arctic eelpout are distrib ted at lesser depths and at lower bottom temperature than warm-water Vahl s eelpout. Relatively to temperate re patterned eelpout take an intermediate position between Arctic an Vahl s eelpouts. Average length of Arct:c eelpout in northern areas is less than that in the south. Averag lengths of patterned and Vahl s eelpouts differ insignificantly by areas Mean catch per hour tr wling with fine-mesh trawl in Div. 2J brought 4.5 kg of the most numerous Arctic eelpout and in div. 3L - 3.4 kg. Introduction The present paper is a attempt to find out some features of eelpouts biology for the N wfoundland and South Labrador subareas. Literature available conta ns only scattered data on ecology of eel- pouts, in particular, on their relation to temperature and water salinity (Knipovich, 1926; Andriyashev, 1954). Data on lengths of some species of eelpout ar more frequent (Laken, 1898, Jensen, 1904, 1952; Knipovich, 192, ; Andriyashev, 1954; Leim, Scott, 1966). But all these data are based only on some specimens taken, that is why data obtained by us fr m materials of the total trawl survey may be of a certain interest. Eel..-pouts are not comm rcial species of fish. They may be found in a bottom trawl as a rul individually or by dozens but almost in every trawl.
It is necessary to consider, of course, that our data were o tamed with the help of fine-mesh trawl only. This paper deals with the most numerous 3 species of eelpouts: Arctic (Lycodes reticulatus), patterned (Lycodes esmarki) and Vahl s (Lycodes vahlii) eelpouts. Their horizontal distribution, distribu- tion by depths and size composition are presented. According to the PINRO laboratory of raw materials biochemistry flesh of Arctic eelpout contains 16.3% of proteins and 5.5% of fats, i.e. it is close to that of Atlantic wolffish and spotted wolffish (by its composition) which is of great nutritional value. Material and methods Data on size composition were collected during total trawl sur- veys carried out in summer periods from 1978 to 1980.by R/V "Persey BMRT "Suloy" and BMRT "N.Kononov". Fish-counting trawlings were made by bottom trawl, their dura- tion was 1 hour. A fine-mesh kapron netting (mesh-size 8 mm from knot to knot) was inserted in the trawl sack. Only accident-free trawlings were taken into consideration. More detailed description of materials and methods of total trawl survey see in paper by Konstantinov (1981). Data on horizontal and vertical distribution are used only for 1978 when the richest material was collected. Fig.4 gives average number of specimens of each species of eel- pouts per hour trawling with bottom trawl at different depths and different bottom temperature .: ,= Number of trawlings the results of which are used in this paper is shown in Table 1. "Frequency of occurence" represents a relationship (in per cent) between those trawlings which brought eelpouts and total number of trawlings carried out at certain depth and at certain temperature (Tables 2, 3 and 4).
Distribution of eelpouts in Divisions of Newfoundland and South Labrador Distribution of Arctic, patterned and Vahl s eelpouts in Divi- sions of Newfoundland and South Labrador according to the data of 1978 is presented on Figures 1,2,3. In their horizontal distribution eelpouts follow the near-bot- tom temperatures. Cold-loving Arctic eelpout are distributed mainly at temperatures from 0° to 3°C on the Grand Bank eastern slope and also in Div.2J (Hamilton Bank) at temperatures from 1° to 3°C. In distribution of patterned eelpout their relation to bottom tempera- tures is less distinct.. They werefound at temperature higher than 3°C and in less quantities at temperatures from 1 to 3°C. Vahl s eelpout being more heat-loving than Arctic and patter- ned ones and dwelling in waters with higher salinity (Andriyashev, 1954) were not found in polar waters. They are distributed mainly in waters of moderate latitudes which have higher temperatures and - 3 - salinity (Elizarov, 1963). The most numerous Vahl s eelpout are at temperatures over 3°C. Distribution of eelpouts at different depths and bottom temperatures
Arctic eelpouts are distributed in a wide range of depths: from . o 70 to ?20 m at water tempe ature near bottom from 1 to 3 5 C (Fig.4). The largest catch s of this species were at depths 200-300m at temperatures 1.6 - 2.0° These depths and temperatures may be considered as optimal for ctic eelpout. In their relation to to perature patterned eelpout are in an inter mediate position between ctic and Vahl s eelpouts. This species is distributed at bottom Temperatures from 0° to 5°C at depths from 70 to 740 m (Fig.4). Temperatures 2.6 - 3.5°C and depths 250 - 350 m are optimal for thi species. In other words, patterned eelpout prefer higher bottom temperatures and deeper waters than Arctic eelpout. Being still more heat loving Vahl s eelpout are found only at positive temperatures fro 0.6 to 4.5°C at depths from 185 to 600 m (Fig.4). Average catch o this species per hour trawling does not show sharp variations by • epths and by different bottom temperatu- res. Though in shallow-wa er areas and at temperatures of water less than 2°C Vahl s eelpout are very seldom in trawls.
Frequency of occurenc of the 3 species of eelpouts in catches. at different depths and d. fferent bottom temperature is shown in Tables 2,3,4. Comparing i with average number of specimens taken during one hour trawling Fig.4) we may see the similarity in eel- pouts distribution charac eristics.
Size composition The material obtained is insufficient for determining any inter- annual or interseasonal variations in eelpout size composition, it allows only to compare av rage lengths of different species in diffe- rent areas. Arctic eelpou r is larger than patterned and Vahl s eel- pouts. This species reach d length of 75 cm in our catches. Their size composition in Divis ons 3N, 3L and 2J is presented on Fig.51 Average length of Arctic elpout in these Divisions was 50.8, 45.8, 43.0 cm, respectively; th y are larger in the south than in the north. Patterned eelpout rea•hed 63 cm in our catches. Their size com- position in Div. 3L, 3K a d 2J is presented on Fig.6. Average length in these Divisions was 34.2, 34.8 and 35.8 cm, respectively, i.e. it didn t change signific ntly. The longest Vahl s eelpout described by Leim and Scott (1966) reaches 33 cm. According to Jensen (1952) Greenland form of this species reaches 52 cm. In our catches we had an individual of 51 cm long. Age composition of ahl s eelpout in Div. 3K and 2J is given on Fig. 7. Their average length varies from 33.4 to 34.3 cm. Abundance and biomass •
As it was stated above eelpouts are not the main commercial spe- cies, they are found only as by-catch. Nevertheless, frequency of their occurence is rather high, it is worth mentioning that eelpouts play a certain role in predatory fish (particularly, cod and halibut) nutrition. Mean catch per hour trawling with fine-mesh trawl was 4.5 kg of the most numerous Arctic eelpout in Div. 2j , and that in Div.3L was 3.4 kg. Maximal catch of this species per hour trawling was 85 kg in Div.2J. Maximal number of specimens of patterned and Vahl s eelpouts per hour trawling was also registered in Div.2J; there were 129 and 74 specimens, respectively.
Conclusions Eelpouts are non-commercial fish which are almost permanently met with as a by-catch during bottom trawl fishery at depths 100-300m. Mean catch per hour trawling with fine-mesh trawl was 4.5 kg of the most numerous Arctic eelpout in Div.2J, and that in Div.3L was 3.4 kg. In their horizontal distribution eelpouts to a great extent fol- low the bottom layer temperature. Arctic eelpout are distributed o mainly at temperatures from 0 to 3o C. Distribution of patterned eelpout is less related to bottom tem- perature, though most frequently they are found at temperatures 1-3°C. Vahl s eelpout contrary to Arctic and patterned ones is absent in Polar waters. They are distributed mainly in moderate latitude waters at temperatures over 3°C. There exists a difference between these 3 species distribution in different depths. Arctic eelpout prefer lesser depths than the other species. Arctic eelpout is the largest. In the north their average length is less than that in the south. Average length of patterned and Vahl s eelpouts varies insigni- ficantly in different divisions. - 5 -
EFERENCES
Andriyashev, A.P., 1954. Fishes of the USSR North seas. M., p.266- 307. Elizarov, A.A., 1963. On pceanologic conditions determining produc- tivity of main commercial fish in the northwestern part of North At antic "Oceanologiya", vol.3, No.6, m. Jensen, A.S., 1904. The orth Eurcbpean and Greenland Lycodinae. The Danisk Ingo f Expedition, yo1.11, No.4, pp.99. Jensen,A.S., 1952. Medde elser om GrOnland, 142, No 1-28. Knipovich, N.M., 1926. D terminator of fish of the Barents, White and Kara seas. M., p.101-112. Konstantinov, K.G., Meth ds and results of the total trawl survey of bottom fish in subarea 3 in 1971-1980. NAFO SCR. Doc. 81/VI 73, Ser.No.358, pp•6. Leim, A.H., Scott, W.B., 1966. Fishes of the Atlantic Coast of Canada, pp 320-326. LUtken Ch. 1898. Det ic thyologiske udbytte. Den. Danske Ihgolf- Expedition Andet bind, Nr.1, 19-22. -
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