ハシボソミズナギドリの死亡原因に関する調査-主として城ヶ島沖で採集された衰弱鳥における病理学的検査成績

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  • Pathological Investigations on Cause of Death in Slender-billed Shearwater collected in Johga-shima Area
  • ハシボソミズナギドリ ノ シボウ ゲンイン ニ カンスル チョウサ シュ ト

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The purpose of this paper is to clarify the cause of death and emaciation of Puffinus tenuirostris that occur along the Pacific coast of Japan. The pathological, hematological and parasitological investigations were applied on 34 dead and sacrificed Puffinus tenuirostris which were mainly collected in Johga-shima area of Japan in the period from May to June, 1978.<br>Gross lesions seen at necropsy were the atrophy and cloudy swelling of skeletal muscle and atrophy of subcutaneous adipose tissues (19/34). All the birds were considered to be very young from the histological findings of testis, ovary, bursa fabricius and other organs. Histopathologically, the following findings were obtained. The degeneration of skeletal muscle (21/31), hemosiderosis of liver (16/31) and kidney (7/26), atrophy of spleen (14/17), hyaline droplet degeneration of renal tubule (9/26), colloidal degeneration of bone-marrow (1/1), and degeneration of myocardium (10/32). Hematologically, severe anemia (2/10), and polychromasia and hypochromia of erythrocytes were seen (4/10). In the investigation of parasite, severe parasitism of Ixodoidea belonging to Procellariphahaga longithororacica (Piaget, 1880) and Halipeurus abonorimis (Piaget, 1885), and Cestoda of Tetrabothrius scoogi (Nybelin, 1916) were observed. However, malaria-like protozoa were not found.<br>In summary, the investigation of the present cases revealed that no findings of infectious disease were seen, and anemia and malnutrition were thought to be the cause of death in very young bird.

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