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- W2316691503 abstract "IN this study the bluegill was chosen because the Centrarchidae is a family of fishes in which the functional gas bladder has no pneumatic duct connection with the esophagus. This type of gas bladder in other fishes is generally attributed to arise as a dorsal diverticulum of the esophagus by way of a pneumatic duct which subsequently atrophies. However, whether the gas bladder arises in the bluegill as conventionally described in other groups, or in some other manner, can be established only by direct study. This investigation, suggested by Dr. John W. Price, was consequently undertaken to determine the actual mode of embryonic development of the gas bladder in Lepomis m. macrochirus Rafinesque, and the time during which such development occurs. Embryos and postlarvae of the following periods of incubation were studied: 1 day (7 and 19 hours); 2 days (7 and 19 hours); 3 days (9 and 21 hours); 4 days (9 and 21 hours); 5 days (21 hours); 6 days (9' and 21 hours); 7 days (9 hours); 8 days (9 hours); 9 days (9 hours); and a 14-mm postlarva. The material was kindly supplied by Dr. G. D. Morgan of Denison university. Sectioning was done by the paraffin method and staining was done in Mallory's phosphotungstic acid hematoxylin. As critical sections of each embryonic series were located, they were marked and photomicrographs were made (Pls. I-II). The first manifestation of the gas bladder in the bluegill was observed in the three-day 21hour embryo. It appears in sagittal sections as a dorsal diverticulum of the esophageal region of the alimentary canal at the level of the third pair of body somites (Fig. 1). Transverse sections of this stage of development show the gut lying to the left of the midline of the embryo and the diverticulum coming off the right side of the gut (Fig. 2). The four-day 9-hour embryo shows the diverticulum pointing toward the ventral edge of the notochord (Fig. 3). Later stages of incubation show the gut in the middle of the embryo and the gas bladder developing" @default.
- W2316691503 created "2016-06-24" @default.
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- W2316691503 date "1952-06-26" @default.
- W2316691503 modified "2023-09-26" @default.
- W2316691503 title "The Embryonic Origin of the Gas Bladder in the Centrarchid Fish Lepomis macrochirus macrochirus" @default.
- W2316691503 doi "https://doi.org/10.2307/1438540" @default.
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