E

Fig. 19.1 Spatial distribution and relative abundance (ind. per haul) ofthe boreal clubhook squid in the Pacific waters off northern Kurile Islands and southeastern Kamchatka, 1993-2002 (1 -Shumshu Isl, 2 - Paramushir Isl, 3 - Onekotan Isl, 4 - Shiashkotan Isl, 5 - Fourth Kurile Strait, 6 - underwater plateau; thin lines are isobaths 100, 200, 500, and 1000m).

maximum concentration was recorded against the Fourth Kurile Strait, though it was on the southern part of the slope of the underwater plateau southeast of Shiashkotan Island that Moroteuthis robusta was most frequent.

In the Pacific waters of the northern Kurile Islands and southeastern Kamchatka, the boreal clubhook squid occurred in catches taken from 198-620 m (average depth of 399.4 m). Meanwhile, the majority of squids (66.7%) were recorded within the 351-550 m range of depths (Fig. 19.2).

The boreal clubhook squid seen in the Pacific waters off the northern Kurile Islands and southeastern Kamchatka occurred at bottom temperatures of 0.45-4.15°C (average 3.09°C); most individuals (72.9%) were recorded within 3.1-4.0 °C (Fig.19.3).

In waters of the Pacific near the northern Kurile Islands and southeastern Kamchatka, the species under review was represented by individuals having 43-184 cm mantles (average 91.76 cm). No single size group prevailed (Fig. 19.4). The squids having 46-55 cm (15.9%) and 111-135 cm (28.6%) mantle were most frequent.

In our catches the species' body mass was within 1.1-36.4 kg (average 11.91 kg). Over half of those individuals (51.2%) weighed less than 10 kg each (Fig. 19.5).

Given below is the relation obtained from 41 measurements (R2 = 0.9266):

W = 1.839 x 10-4 x DML24290, where W is total body mass (kg), and

DML is mantle length measured along the dorsal side (cm).

The values calculated by the formula given agree well with the empirical data (Fig. 19.6).

<200 201-250 251-300 301-350 351-400 401-450 451-500 501-550 551-600 >600

Fig. 19.2 Vertical distribution of the boreal clubhook squid in the Pacific waters off the northern Kurile Islands and southeastern Kamchatka, 1993-2002 (n = number of observations).

<200 201-250 251-300 301-350 351-400 401-450 451-500 501-550 551-600 >600

Depth, m

Fig. 19.2 Vertical distribution of the boreal clubhook squid in the Pacific waters off the northern Kurile Islands and southeastern Kamchatka, 1993-2002 (n = number of observations).

O 20 10

n=38

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