Vascular pathways in the gill filaments of the flounder, Platichthys flesus L.

The axolotl is a strictly aquatic salamander in which the larval external gills are retained throughout life. The external gills of the adult axolotl have been studied by light and electron microscopy for ultrastructural evidence of ionic transport. The thin epidermis of the gill filaments and gill stems is composed of 3 cell types: granular cells, the basal cells and a sparce population of intervening Leydig cells. The gill epidermis is devoid of muscles, and no mitotic figures were observed in any of its cells.The granular cells cover the gill surface as a continuous layer (Fig. 1, G) and contain secretory granules of different forms, located apically (Figs.1, 2, SG). Some granules are found intimately associated with the apical membrane while others fuse with it and release their contents onto the external surface (Fig. 3). The apical membranes of the granular cells exhibit microvilli which are covered by a PAS+ fuzzy coat, termed “glycocalyx” (Fig. 2, MV).

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Food and feeding habits of juvenile flounder Platichthys flesus (L.), abd turbot Scophthalmus maximus L. in the åland archipelago, northern Baltic Sea

Netherlands Journal of Sea Research ◽

10.1016/s0077-7579(96)90058-7 ◽

1996 ◽

Vol 36 (3-4) ◽

pp. 311-320 ◽

Cited By ~ 1

Author(s):

K Aarnio

Keyword(s):

Baltic Sea ◽

Feeding Habits ◽

Scophthalmus Maximus ◽

Platichthys Flesus ◽

Food And Feeding ◽

Turbot Scophthalmus Maximus

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Studies on Prevailing Parasitic Fish Diseases in Pre-mature Cultured Sea bass, Dicentrarchus labrax, Sea bream and Mugil cephalus at Ismailia, Province with Special References to Control

International Journal of Veterinary Science ◽

10.37422/ijvs/20.075 ◽

2020 ◽

Keyword(s):

Parasitic Infection ◽

Dicentrarchus Labrax ◽

Sea Bass ◽

Mugil Cephalus ◽

Sea Bream ◽

Fish Diseases ◽

Total Prevalence ◽

Dark Colour ◽

Gill Filaments ◽

Mature Fish

This study concentrated on the assessment of the prevailing parasitic fish diseases in some marine fishes at Ismailia province and how to control the infestation using microalgae. This study was carried out on 1080 pre-mature fish (360 D. labrax (225±25 g) and 360 S aurata (150±25 g) and 360 M. cephalus (125±25 g) collected from similar ponds of studies to be examined at the end of treatment. In addition to that we followed non-treated fish (1080 premature). The infested fish showed dark colour and respiratory signs. Post mortem lesions were a presence of congestion or paleness and destruction of gill filaments. The total prevalence of infestation was the total prevalence of parasitic infection of non-treated fishes was 45.83 %. The highest percentage was in D. labrax 56.94 % followed by S. aurata 47.22%, the lowest percentage in M. cephalus 33.33. The total prevalence of parasitic infection in premature treated with 2 g algae was 28.79%, followed by 3 g algae was 23.60 %, while the lowest percentage with 5 g algae was 20.37 % respectively. The detected species of parasites were protozoal parasites, Amyloodinium ocellatum and Riboscyphidia in additions of marine monogenea, Lamellodiscus diplodicus isolated from D Labrex, Mugil Cephalus and S aurata. The present study concluded that, the use of microalgae instead of fish meal decreased parasitic infestation in marine fish. The histopathological alteration of natural infested examined fishes was also recorded.

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The occurrence and distribution of nonylphenols and nonylphenol ethoxylates in different species of fish

Environmental Science Processes & Impacts ◽

10.1039/c9em00584f ◽

2020 ◽

Vol 22 (4) ◽

pp. 1057-1070 ◽

Cited By ~ 1

Author(s):

Wiesława Ruczyńska ◽

Joanna Szlinder-Richert ◽

Tomasz Nermer

Keyword(s):

Gadus Morhua ◽

Anguilla Anguilla ◽

Nonylphenol Ethoxylates ◽

Platichthys Flesus

The aim of this study was to analyze the accumulation of nonylphenols (NPs) and nonylphenol ethoxylates (NPEOs) in the muscles, liver, and bile of flounder (Platichthys flesus), cod (Gadus morhua), and eels (Anguilla anguilla).

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Spatial distribution of the parasite Kroyeria carchariaeglauci Hesse, 1879 (Copepoda: Siphonostomatoida: Kroyeriidae) on gills of the blue shark (Prionace glauca (L., 1758))

Canadian Journal of Zoology ◽

10.1139/z87-199 ◽

1987 ◽

Vol 65 (5) ◽

pp. 1275-1281 ◽

Cited By ~ 11

Author(s):

George W. Benz ◽

Kevin S. Dupre

Keyword(s):

Spatial Distribution ◽

Natural Selection ◽

Distribution Pattern ◽

Surface Area ◽

Blue Shark ◽

Prionace Glauca ◽

Homogeneous Groups ◽

Secondary Lamellae ◽

Gill Filaments ◽

Gill Surface Area

Five blue sharks (Prionace glauca) were examined for gill-infesting copepods. Three species of siphonostomatoid copepods were collected: Gangliopus pyriformis, Phyllothyreus cornutus, and Kroyeria carchariaeglauci. The spatial distribution of K. carchariaeglauci was analyzed. The number of K. carchariaeglauci per shark was positively related to gill surface area and host size. Copepods were unevenly distributed amongst hemibranchs; flanking hemibranchs could be arranged into three statistically homogeneous groups. Female K. carchariaeglauci typically attached themselves within the middle 40% of each hemibranch; males were more evenly dispersed. Eighty percent of all K. carchariaeglauci attached themselves to secondary lamellae, the remainder were in the underlying excurrent water channels. Most K. carchariaeglauci were located between 10 and 25 mm along the lengths of gill filaments. Overall, the spatial distribution of K. carchariaeglauci was quite specific in all study planes. Explanation of this distribution is set forth in terms of natural selection pressures; however, the equally plausible explanation that the distribution pattern exhibited by these copepods is phylogenetically determined and may have little to do with contemporary selective constraints should not be ignored.

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