Morphological characteristics of visual cells in the endemic Korean loach Kichulchoia multifasciata (Pisces; Cobitidae) by microscopy

Abstract

The visual cell of the retina in the Korean loach (Folia Morphol 2017; 76, 2: 186-190)

A Histological Study on the Visual Cell Layer of the Endemic Korean SpeciesLiobagrus mediadiposalis(Pisces: Amblycipitidae)

“…Among Korean fishes investigated on the visual cells, Coreoperca herzi consists of a double cone with the same size in two members, a short single cone and a rod, and I. longicorpa has a double cone with one long and one short member and a rod Kim et al, 2014). In L. medidiaposalis, the single cone cells are mean 18 μm in length and rod cells are mean 54.8±2.9 μm in length, while M. angulicaudatus 24.0 μm and 51.4 μm, K. multifasciata 21.6 μm and 53.3 μm, I. longicorpa 26.4 and 40.1 μm, respectively , 2017. The cone cells of L. mediadiposalis are shorter and its rod cells are longer that those having similar ecological habitats.…”

“…The thickness of the visual cell layer and its outer nuclear layer may be used as an indicator for the development of the visual cell in interspecies (Hagedorn et al, 1998;Lee & Lim, 2005;You & Park, 2008). For this fish, the thickness of the visual cell layer and the outer nuclear layer is 151.0±4.0 μm and 9.3±2.1 μm, while known as Korean benthic fishes similar to L. mediadiposalis's habitat, Iksookimia longicorpa is 216.4±13.4 μm, 13.42±2.2 μm , Misgurnus angulicaudatus 173.6±17.8 μm, 9.8±3.6 μm , and Kichulchoia multifasciata 191.2±13.7 μm, 10.4±1.9 μm (Kim & Park, 2017), respectively. This difference between L. mediadiposalis and three cobitid fishes may be related to their feeding activity (nocturnal vs. diurnal) although they all are gravel-covered bottom dwellers.…”