期刊
ENVIRONMENTAL BIOLOGY OF FISHES
卷 85, 期 1, 页码 33-38出版社
SPRINGER
DOI: 10.1007/s10641-009-9453-z
关键词
Mola mola; Ocean sunfish; Retinal ganglion cell; Visual acuity; Main visual axis; Visual field; Retina
资金
- Tokai Art and Science Foundation
- JSPS [17570077]
- Grants-in-Aid for Scientific Research [17570077] Funding Source: KAKEN
The ocean sunfish, Mola mola, is the largest known bony fish. Based on prior studies of diet composition, it is considered to be a pelagic zooplanktivore. However, a recent study using acoustic telemetry revealed that they repeatedly dive to depths of > 50 m during the day. We examined the distribution of cells within the retinal ganglion cell layer in the immature ocean sunfish (c.a. 50 cm total length) and estimated their visual acuity with respect to the main visual axis and visual fields. Visual acuity was between 3.37 and 4.41 cycles/degree. The region of highest cell density was located in the dorso-temporal retina, indicating that the main visual axis of ocean sunfish is directed towards the lower frontal portion of the visual field. This axis is considered beneficial for detecting prey items when the sunfish are migrating vertically through the water column, and in foraging behavior near the sea bottom.
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