| Num |
Date |
Index |
Chg. |
Chg. % |
| 1 |
2015-02 |
488.17 |
212.17 |
43.46% |
| 2 |
2015-01 |
276.00 |
3.66 |
1.33% |
| 3 |
2014-12 |
272.33 |
40.35 |
14.82% |
| 4 |
2014-11 |
231.98 |
14.92 |
6.43% |
| 5 |
2014-10 |
217.06 |
7.68 |
3.54% |
| 6 |
2014-09 |
209.38 |
-5.80 |
-2.77% |
| 7 |
2014-08 |
215.18 |
-39.46 |
-18.34% |
| 8 |
2014-07 |
254.64 |
-48.14 |
-18.91% |
| 9 |
2014-06 |
302.78 |
110.26 |
36.41% |
| 10 |
2014-05 |
192.52 |
-13.12 |
-6.81% |
特徴
 |
| 産地： | It is distributed both in south and north China. In north, it is bigger than that of south. It spends winter in the Yellow Sea, and migrates to Bohai Sea in spring so as to form spring fishing season. In autumn, it migrates back so as to form Autumn fishing season. In south, it migrates to north and south coast in different seasons. In spring, it migrates to the north for spawning, and in winter It migrates back. In East China Sea, there are both spring and autumn fishing seasons. The spawning period of beltfish is very long which is from April to June and from September to November each year. For one time, it spawns about 250000 to 350000 ones. And the suitable temperature should be between 17-23 Celsius degrees. |
| 特徴： | Dorsal spines (total): 3; Dorsal soft rays (total): 130-135; Anal soft rays: 100 - 105. Body extremely elongate, compressed and tapering to a point. Mouth large with a dermal process at the tip of each jaw. Dorsal fin relatively high; anal fin reduced to minute spinules usually embedded in the skin or slightly breaking through; anterior margin of pectoral fin spine not serrated. Pelvic and caudal fins absent. Lateral line beginning at the upper margin of the gill cover, running oblique to behind the tip of the pectoral fins, then straight close to the ventral contour. Fresh specimens steely blue with silvery reflections, becoming uniformly silvery gray sometime after death (Ref. 6181).
Maturity: Lm 46.3, range 30 - 99 cm
Max length : 234 cm TL male/unsexed; (Ref. 26340); common length : 100.0 cm TL male/unsexed; (Ref. 26999); max. published weight: 5.0 kg (Ref. ); max. reported age: 15 years (Ref. 7142)
Biology:
Generally over muddy bottoms of shallow coastal waters (Ref. 9351). Often enter estuaries (Ref. 9351). Juveniles feed mostly on euphausiids, small pelagic planktonic crustaceans and small fishes; adults feed mainly on fishes and occasionally on squids and crustaceans (Ref. 6181). Adults and juveniles have opposing complementary vertical diurnal feeding migration. Large adults usually feed near the surface during the daytime and migrate to the bottom at night. Juveniles and small adults form schools 100 m above the bottom during the daytime and form loose feeding aggregations at night near the surface. Pelagic eggs (Ref. 35388) and larvae (Ref. 6768). Max weight of 1.5 kg given in Ref. 28023 seems too low. |
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