Fig. 1. Normal fish (the upper one) and abnormal fish (the lower two ones).
(Photo by K. Momoyama)
| Abnormality | Loss of dorsal fins |
|---|---|
| Fish | Ayu (Plecoglossus altivelis) |
| Clinical signs | Dorsal fins are lacking |
| Health hazard | Since the abnormal fish is not harmful to human, it is no problem in food hygine. |
| Diagnosis | Check the presence or absence of dorsal fins. |
| Other information | It is speculated that the loss of dorsal fins is caused by management of fish rearing, possibly a malnutrition during the period of fry (Momoyama and Tensha, 2006). |
| References | Momoyama, K. and K. Tensha (2006): Ugly-looking parasitic infections and
other abnormalities of wild fish and shellfish caught in the coastal or
inland waters around or in Yamaguchi Prefecture. Bull. Yamaguchi Pref. Fish. Res. Ctr., 4, 143-161. (In Japanese)
|
