The position of the retinal area centralis changes with age in Champsocephalus gunnari (Channichthyidae), a predatory fish from coastal Antarctic waters
The position of the retinal area centralis changes with age in Champsocephalus gunnari (Channichthyidae), a predatory fish from coastal Antarctic waters
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DOI：
10.1007/s00300-011-0969-2
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发表时间：
2011-02
期刊：
影响因子：
1.7
通讯作者：
T. Miyazaki;T. Iwami;V. Meyer-Rochow
中科院分区：
文献类型：
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作者：
T. Miyazaki;T. Iwami;V. Meyer-Rochow
组织学检查的地形分布和区域的最高密度（thearea centralis：AC）的假定视网膜神经节细胞在视网膜中发现在0- 6岁Champsocephalus gunnari揭示年轻和老年鱼之间的差异。2岁以下的个体在颞部视网膜中具有AC，而在3岁、4岁、5岁和6岁的鱼中，AC位于视网膜的腹颞区。C.在生长过程中，gunnari从面向前方变为向上向前，这与该物种的生境从中上层到底栖的变化相对应。此外，AC在0- 3岁的鱼是接近视网膜周边，但在4- 6岁的鱼向视网膜内层位移。这意味着年轻鱼的水平面中的视轴指向视觉的前部，而在年长的鱼中，稍微更侧向的位置是有利的。因此，年轻的鱼可以预期拥有上级双目视觉时，它来到猎物接近他们面前，但在老年鱼似乎更重要的是有一个更广泛的视野，以发现猎物（可能是捕食者）在更大的水体积。
Histological examinations of the topographical distribution and the area of highest density (thearea centralis: AC) of presumed retinal ganglion cells found in the retina in 0- to 6-year-oldChampsocephalus gunnarirevealed differences between younger and older fish. Individuals of up to 2 years of age had the AC in the temporal retina, whereas in 3-, 4-, 5- and 6-year-old fish it was positioned in the ventro-temporal region of the retina. The main visual axis in the pitch plane ofC. gunnariwas shown to shift from facing forward to an upward-forward direction during growth, corresponding to the habitat change in this species from pelagic to benthic. Moreover, the AC in 0- to 3-year-old fish was near the retinal periphery, but displaced towards the inner retina in 4- to 6-year-old fish. This means that the visual axis in the horizontal plane of the younger fish was directed towards the frontal sector of vision, while in the older fish a slightly more lateral position was favoured. Therefore, younger fish can be expected to possess superior binocular vision when it comes to prey closely in front of them, but in older fish it seems more important to have a wider visual field to detect prey (and possibly predators) within a greater volume of water.