Morphological and Physiological Studies on the Phytoplankton Feeders in Cyprinid Fishes-I Developmental Changes of Feeding Organs and Ingestion Rates in Kawachibuna (Carassius auratus cuvieri), Silver carp (Hypophthal- michthys molitrix) and Nigorobuna (C. auratus grandoculis)
Morphological and Physiological Studies on the Phytoplankton Feeders in Cyprinid Fishes-I Developmental Changes of Feeding Organs and Ingestion Rates in Kawachibuna (Carassius auratus cuvieri), Silver carp (Hypophthal- michthys molitrix) and Nigorobuna (C. auratus grandoculis)
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鲤鱼浮游植物摄食者的形态和生理研究-Ⅰ河内鲫、鲢鱼和黑鱼摄食器官的发育变化和摄食率
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Katsuya Iwata
中科院分区：
文献类型：
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作者：
Katsuya Iwata
The course of morphological development of feeding organs of the phytoplankton feeders, Kawachibuna, which is a domesticated race of Gengorobuna (Carassius auratus cuvieri) and Silver carp (Hypophthalmichthys molitrix), were compared with those of the omnivorous fishes, Nigorobuna (C, auratus grandoculis) and Big head (Aristichthys nobilis). In addition, a comparison of the functions of the feeding organs in Kawachibuna, Nigorobuna and Silver carp was attempted by measuring the ingestion rates of two different sizes of 14C labeled green algae (Closterium mniliferum, 300 ƒÊin length and Selenastrum sp., 1OƒÊ) at various growth stages of these fishes. In Kawachibuna and Nigorobuna of 13 mm in total length, the number of gillrakers are almost equal, but the feature of micro-spines on each gillraker appears considerably different (See Fig. 3). In Kawachibuna of more than 20 mm length, the number of gillrakers exceeds that of Nigorobuna of the same length, and the micro-spines on gillrakers are more complicated. In Silver carp less than 20 mm in total length, numerous filaments on gillrakers are not fused as in the adult Big head's. At 26 mm, one or two fused parts are found in a middle part of the gillrakers, and the number of the fusions increases with growth (see Fig. 4). Among the four cyprinid fishes with the same length, no marked difference in the maximum length of gillrakers on the first gillarch is observed. However, the maximum length of gillrakers on the second gillarch becomes longer in the order of Nigorobuna, Kawachibuna, Big head and Silver carp. Relationship between the ingestion rates (I, mgC/hr) in water containing a high density of Selenastrum and body weight (W, mg) were expressed by the following formula; 1=3.28W0.79 in Kawachibuna and I=2. 25W0.73 in Silver carp. The ingestion rates for Closterium relating to body weight of the both fishes were also expressed as zI=5.14W0.72 in Kawachibuna and I =3.18W0.89 in Silver carp. The both ingestion rates for Closterium and Selenastrum took a close value in Kawachibuna and Nigorobuna less than 11 mm in total length. However, in Nigorobuna of more than 11 mm, the ingestion rates for the both species of algae became lower than those of Kawachibuna with the same length. It is suggested *京 都大学審査学位論文の一部. **京 都大学理学部大津臨湖実験所邦交業績,新 第58号.