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国内血統登録書から見たゴマフアザラシの保護個体の現状
寺沢 文男
新江ノ島水族館

要約
1）　ゴマフアザラシPhoca largha 血統登録台帳1986～2004年の19年分を用いて，保護個体の現状分析を行った．内訳は，保護個体434頭（46.3％），繁殖個体475頭（50.6％），不明29頭（3.1％）だった．

2）　保護した都道府県は，北海道の232頭および東北地方を中心とし14県で25頭であった．

3）　死亡した年齢は，0歳80頭（27.2％），1歳32頭（10.8％）であった. 最長年齢は推定38歳であった．
4） 保護時の年齢は0～11歳で，最も多い年齢は0歳であり，生存率は55.5％であった．1歳の生存率は81.3％であった．尚，2歳以上の死亡はなかった．
5）　保護年齢0歳の保護月は5月が46.2％，4月38.6％であった．生存率は5月55.3％，4月54.9％であった．
6）　保護年齢は0歳では保護から0～6日目まで56.7％が死亡した．
7）　保護年齢0歳の60日までの死因は，衰弱死16頭（43.2％），肺炎（合併症を含む）12頭（32.4％）であった．

ABSTRACT．　The current status of rescued Spotted Seals was surveyed through the Japanese Association of Zoo and Aquarium Studbooks from 1986 to 2004. This information was analyzed based on 434 animals rescued from the wild (ARWs).
　Spotted Seals were rescued from 15 administrative divisions of Japan, including two divisions (Saga, and Miyazaki) of Kyushu. In Hokkaido, 232 out of 257 ARWs were observed. However, animals were not observed in Shikoku.
　The most frequent age at death of ARWs was less then one year for 80 animals (27.2％), and one year for 32 animals (10.8％). On the other hand, one ARW was estimated to be 38 years old.
　The ages of ARWs varied from less then one year to 11 years. Most of the ARWs were less than one year old. 106 animals survived, 86 animals died, and the survival rate was 55.5％. The survival rate for ARWs at one of age was 81.3％ (13 survived; 3 deaths). No ARW deaths occurrsd after two years.
　The three most frequently occurring months for ARWs of less than one year were May, April and June. The survival rates were 55.3％ (47 survivals ; 38deaths), 54.9％ (39 ; 32), and 54.5％ (6 ; 5) respectively.
　The number of less than one year ARW deaths was examined for the first 60 days after rescue. The most frequent numbers of ARW deaths per day were 9 (12.1％) on the second day (one day passed), 7 (9.4％) on the third day, and 6 (8.1％) on the first and fifth days. The most frequent numbers per week were 42 (56.7％) in the first week.
　Causes of death for less than one year ARWs were examined for the first 60 days after rescue. Sixteen seals (43.2％) died due to weakness, and 12 seals (32.4％) due to pneumonia including coexisting illness with pneumonia.