Fine Structure of Gut Epithelial Cells of Larval and Juvenile Carp During Absorption of Fat and Protein

Iwai, Tamotsu

doi:10.1679/aohc1950.30.183

Cited by 61 publications

(34 citation statements)

References 32 publications

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“…Iwai 1969;Gauthier and Landis 1972;Burkhardt and Storch 1989). Accordingly, Deplano et al (1991) noted for Dicentrarchus labrax that the mucosal cells of the prevalvular intestine showed most adult-type cytological features before the first uptake of food.…”

Section: Resultsmentioning

confidence: 99%

The development of functional digestive and metabolic organs in turbot, Scophthalmus maximus

et al. 1994

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The functional status of organ systems involved into the processing of exogenous food is critical for the survival and growth of fish early life stages. The present study on laboratory-reared larval turbot, ScophthaImus maximus, provides an overview on the ontogeny of structure and functions involved in digestion, absorption and metabolism of nutrients. At start of exogenous feeding the intestine of larval turbot is anatomically differentiated, with enterocytes displaying an adult-type ultrastructure and being able to process lipids. At the microvillous border of the enterocytes, enzymes of contact digestion such as aminopeptidase are found. The ultrastructure of the exocrine pancreatic cells is fully differentiated from hatching onwards. Likewise, substantial activities of trypsintype proteases are present. A stomach anlage exists in firstfeeding larvae; however, the stomach becomes functional (appearance of gastric glands and pepsin secretion) only during metamorphosis. Liver parenchymal cells already display a functional ultrastructure during the endotrophic phase; with onset of exogenous feeding they develop pronounced diet-related changes of their energy stores. Larval respiration is not executed by the gills since respiratory surface of these structures develops only towards metamorphosis. The energy generation of larval muscle tissue depends on aerobic metabolism, whereas glycolytic activCommunicated by O. Kinne, Oldendorf/Luhe H. Segner I (m) 9 W. Kloas

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Section: Resultsmentioning

confidence: 99%

The development of functional digestive and metabolic organs in turbot, Scophthalmus maximus

et al. 1994

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“…Diet organisms were excised from the mid-and hindgut (sensu Iwai, 1969), measured (long and short axis), identified to the lowest possible taxon, and counted. Because copepods and copepodites were often disarticulated, the long and short axis of the head segment was measured.…”

Section: Methodsmentioning

confidence: 99%

Comparative feeding of three species of larval fishes in the Northern Gulf of Mexico: Brevoortia patronus, Leiostomus xanthurus, and Micropogonias undulates

Govoni¹,

Hoss²,

Chester³

1983

Mar. Ecol. Prog. Ser.

110

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The diets of larval gulf menhaden Brevoortia patronus, spot Leiostomus x d n t h u~s , and Atlantic croaker Micropogonias undulatus, collected in the northern Gulf of Mexico in December 1979, February and December 1980, and February 1981, were significantly (P<0.001) different when compared with respect to length by step-wise discriminant analysis, and there was little overlap when the diets of size-specific larvae that CO-occurred in discrete collections were compared by percentsimilarity. Gulf menhaden larvae had a more diverse diet that included phytoplankters (diatoms and dinoflagellates) as well as zooplankters (tintinnids, pelecypods, pteropods, and all stages of copepods). The diets of larval spot and Atlantic croaker were largely restricted to zooplankton. Overall diet distinctiveness, the lack of diet overlap, and the lack of small-scale CO-occurrence indicate that the larvae of these three species do not compete for food.

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“…Standard paraffin procedures have been used with some success for light microscopy (O'Connell 1981), but techniques that use glycol methacrylate as an embedding medium (Govoni 1984) are preferred. Procedures used for TEM of larval tissues are standard (e.g., see Iwai 1969). Boehlert (1984) offers techniques for the preparation of soft larval tissues for examination with SEM.…”

Section: Morphology and Histologymentioning

confidence: 99%

“…The larvae of most 'lower' fishes (e.g., clupeoids, salmonids, and cyprinoids) have a straight alimentary canal, whereas the larvae of 'higher1 fishes (e.g., paracanthopterygians and percomorphs have a looped canal). Notable exceptions to the latter generality are some ostariophysans and salmonids that have looped guts (Iwai 1969) and some stomiatoids that have unusual, trailing, exterilial guts (Moser 1981). Other peculiarities include the occluded guts of elopomorph leptocephali (Hulet 1978, Smith 1984.…”

Section: Introductionmentioning

confidence: 99%

The physiology of digestion in fish larvae

1986

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Fine Structure of Gut Epithelial Cells of Larval and Juvenile Carp During Absorption of Fat and Protein

Cited by 61 publications

References 32 publications

The development of functional digestive and metabolic organs in turbot, Scophthalmus maximus

The development of functional digestive and metabolic organs in turbot, Scophthalmus maximus

Comparative feeding of three species of larval fishes in the Northern Gulf of Mexico: Brevoortia patronus, Leiostomus xanthurus, and Micropogonias undulates

The physiology of digestion in fish larvae

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