Table 1.
Mean abundance (individuals/m2) per month by area of euphausiid species
| Species | SE Hokkaido | Sanriku | Joban | Total |
|---|---|---|---|---|
| Euphausia pacifica † | 130.8 (89.4) | 146.5 (92.2) | 112.3 (90.1) | 126.6 (90.4) |
| Thysanoessa inspinata ‡ | 12.2 (8.3) | 7.3 (4.6) | 1.8 (1.4) | 7.2 (5.1) |
| Euphausia recurva § | 0.1 (0.1) | 1.4 (0.9) | 3.4 (2.7) | 1.8 (1.3) |
| Euphausia mutica § | 0.02 (0.02) | 1.7 (1.1) | 1.9 (1.5) | 1.2 (0.8) |
| Euphausia tenera ¶ | 0 | 0.1 (0.1) | 2.8 (2.3) | 1.0 (0.7) |
| Thysanoessa longipes ‡ | 2.0 (1.4) | 0.3 (0.2) | 0.01 (0.004) | 0.7 (0.4) |
| Euphausia hemigibba § | 0 | 0.5 (0.3) | 0.5 (0.4) | 0.3 (0.2) |
| Euphausia gibboides †† | 0.02 (0.02) | 0.1 (0.1) | 0.6 (0.5) | 0.3 (0.2) |
| Thysanoessa inermis ‡ | 1.0 (0.7) | 0 | 0 | 0.3 (0.2) |
| Euphausia similis ‡‡ | 0 | 0.4 (0.3) | 0.1 (0.1) | 0.2 (0.1) |
| Nematoscelis microps § | 0.02 (0.01) | 0.1 (0.1) | 0.3 (0.2) | 0.1 (0.1) |
| Euphausia nana ‡‡ | 0 | 0.1 (0.1) | 0.2 (0.1) | 0.1 (0.1) |
| Tessarabrachion oculatum §§ | 0.1 (0.1) | 0.1 (0.1) | 0.1 (0.1) | 0.1 (0.1) |
| Stylocheiron affine § | 0 | 0.1 (0.1) | 0.1 (0.05) | 0.1 (0.04) |
| Nematoscelis difficilis †† | 0 | 0.1 (0.1) | 0.1 (0.1) | 0.1 (0.04) |
| Nematoscelis gracilis ¶ | 0 | 0.03 (0.02) | 0.1 (0.1) | 0.05 (0.03) |
| Euphausia diomedeae ¶ | 0 | 0 | 0.1 (0.1) | 0.04 (0.03) |
| Thysanoessa gregaria †† | 0 | 0.04 (0.03) | 0.04 (0.04) | 0.04 (0.03) |
| Pseudeuphausia latifrons ‡‡ | 0 | 0 | 0.1 (0.1) | 0.03 (0.02) |
| Nematoscelis atlantica § | 0 | 0 | 0.1 (0.1) | 0.03 (0.02) |
| Euphausia pseudogibba ‡‡ | 0 | 0 | 0.1 (0.1) | 0.03 (0.02) |
| Stylocheiron carinatum ¶ | 0 | 0 | 0.04 (0.04) | 0.01 (0.01) |
| Stylocheiron longicorne ¶¶ | 0 | 0 | 0.02 (0.02) | 0.01 (0.01) |
| Thysanoessa raschi ‡ | 0.02 (0.02) | 0 | 0 | 0.01 (0.005) |
| Stylocheiron suhmi § | 0 | 0.01 (0.01) | 0 | 0.01 (0.004) |
| Thysanopoda aequalis § | 0 | 0 | 0.01 (0.01) | 0.002 (0.002) |
| Total | 146.3 | 158.9 | 124.6 | 140.0 |
Highest values among areas for each species are in bold type. Species are ranked according to mean abundance in the total survey area. Relative contribution (%) to the total abundance of euphausiids is shown in parentheses. Groups are as follows:
†
Subarctic‐transitional.
‡
Subarctic.
§
West North Pacific.
¶
Equatorial water.
††
Boundary.
‡‡
West Pacific coastal.
§§
Subarctic mesopelagic.
¶¶
Central‐Equatorial mesopelagic.