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種苗生産に関する基礎的研究 (2)マダイの膀胱内異物の性状について THE BASIC STUDY ON THE PRODUCTION OF MARINE FISH SEEDLING II. Some Characteristics of Foreign Bodies in the Urinary Bladder Observed on Marine Fish, Pagrus major (TEMMINCK et SCHLEGEL) Ishioka, Hiroko 石岡, 宏子 イシオカ, ヒロコ Ishioka 石岡 イシオカ Hiroko 宏子 ヒロコ Ueda, Kazuo 上田, 和夫 ウエダ, カズオ Ueda 上田 ウエダ Kazuo 和夫 カズオ Okamoto, Ryo 岡本, 亮 オカモト, リョウ Okamoto 岡本 オカモト Ryo 亮 リョウ Fukuhara, Osamu 福原, 修 フクハラ, オサム Fukuhara 福原 フクハラ Osamu 修 オサム metadata only access As described in the precedent paper, the relationships between the chlorinity of rear- ing medium and the formation of the foreign body and the effects on its formation to the growth and mortality on red sea bream are studied. In this paper, some characteristics of foreign bodies are examined. The fish are fixed in neutral 10% formalin solution, Bouin's fluid and absolute alcohol. The embedded samples in paraffin are cut 5-10 microns thickness and stained with Mayer's hematoxylin-eosin, purpurin, Von Kossa, alizarin S, PAS, Azan and etc. The results obtained are as follows; (1) The appearance of foreign bodies in the segmental duct and the urinary bladder are observed on the typical pronephric stage of Pagrus major (TEMMINCK et SCHLEGEL). (2) The pronephron of this fish is composed of a single elongate glomerulus formed by fusion of the glomeruli of either side, a pair of pronephric tubules, a pair of segmental duct and a urinary bladder. (3) The occurence of hyaline droplets and vacuoles on the tubule cells are observed on the pronephron of the fish holding foreign bodies in the urinary bladder. (4) The foreign bodies are observed in the distal part of the segmental duct and the urinary bladder. On the structure of the foreign bodies, clear stratified forms are sometimes recognized. And it is found that this contains calcium and positive substance for PAS reaction. 海産稚仔魚,特にマダイにみられる尿路系異物について組織学的研究を行ない,下記の知見を得た。(1) 尿路系異物の出現は,マダイの発生過程の中で太い血管系をはさんで融合した大きな1対の糸毬体と,それに続く1対の細尿管,輸尿管と1個の膀胱より成る典型的な前腎期および中腎初期発生期にある。(2) 尿路系に異物を有する稚仔魚の腎臓組織には,細管上皮に,退行変性と思われる症状が認められたが,その他の異常は明らかでなかった。(3) 異物は膀胱内および輸尿管末端部に認められ,組織切片上で形態的には層状をなす場合と,無構造の場合とがあった。また異物を構成するのは,PAS陽性物質とカルシウム成分であることが明らかとなった。 南西海区水産研究所 Nansei Regional Fisheries Research Laboratory 1970-09-30 jpn departmental bulletin paper https://fra.repo.nii.ac.jp/records/2003375 nnf_k_3_11 https://agriknowledge.affrc.go.jp/RN/2010025337 日本農学文献記事索引 agriknowledge https://fra.repo.nii.ac.jp/records/2015614 南西海区水産研究所研究報告 3号　正誤表 AN00181988 0388-841X 南西海区水産研究所研究報告 Bulletin of the Nansei Regional Fisheries Research Laboratory 3 7 11 17