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研究生:張至維
研究生(外文):CHANG, CHIN-WEI
論文名稱:由耳石的微細構造探討淡水河口域烏魚稚魚的日齡及成長
論文名稱(外文):Daily age and growth of juvenile grey mullets Mugil cephalus in the Tan-Shui River Estuary as revealed from otolith microstructure.
指導教授:曾萬年, 李英周
指導教授(外文):WANN-NIAN TZENG, YING-CHOU LEE
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:漁業科學研究所
學門:農業科學學門
學類:漁業學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:84
中文關鍵詞:烏魚河口域耳石日齡成長
外文關鍵詞:Mugil cephalusestuaryotolithdaily agegrowth
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烏魚 (Mugil cephalus) 是本省沿近海漁業的主要漁獲對象及內陸的
養殖魚類。成魚每年 11 月下旬至翌年的 1 月下旬洄游到西南部沿海產
卵,但 10、11 月在沿岸河口域即可捕獲到成群的烏魚稚魚,顯示稚魚的
出現比預期還要早。為了瞭解這些稚魚與產卵洄游群的關係,本研究在
1995 年 11 月至 1996 年 3 月及 1996 年 11 月至 1997 年 3 月的兩
個稚魚出現季節,於台灣北部淡水河口域,每月兩次,進行烏魚稚魚的採
集。首先以化學標識法證明耳石日週輪的可靠性,並由日週輪推估稚魚的
日齡及成長,再由採集日及日齡逆推這些稚魚的孵化日,然後與上述產卵
期進行比較。結果發現,烏魚耳石日週輪的形成具有日週性,由日週輪的
數目可推算日齡。除了日週輪之外,也發現次日輪、副核心、第二成長區
及首次攝食輪等記號,這些記號容易混淆日齡的估算。淡水地區烏魚稚魚
的出現季節為 11 月中旬至翌年的 3 月下旬,其加入群數不止一個。加
入的最小平均體長為 20.56 mm (日齡約 32 天);游出體長為 34.00 mm
(日齡約 62 天)。稚魚在河口域停留的時間為 1 個月左右,此時的成長
率為 0.452 mm d-1。由稚魚日齡所逆推的產卵期約在 10 月至翌年 2 月
,換言之,淡水地區的烏魚稚魚,並非完全來自 11 月下旬至 1 月下旬
的洄游產卵群。
Grey mullets Mugil cephalus are not only important coastal
or inshore species but also very desirable aquaculture species
in Taiwan. Adults migrate to the southwestern coasts of Taiwan
for spawning during late November through the following late
January. However juveniles are captured from early November in
the coastal estuaries. These phenomena indicate the
disagreement in the period between adults spawning and juveniles
occurrence. For understanding the disagreement, the periodicity
of daily growth increments deposited in otoliths of juvenile
grey mullets was validated by using tetracycline immersion.
Then, daily age and growth of the juveniles collected in the Tan
- Shui River Estuary during the periods from November 1995
through March 1996 and from November 1996 through March 1997
were determined by growth increments in otoliths. Spawning
period of the juvenile grey mullets was backcalculated from
their daily age. Except the daily growth increments, several
remarkable checks like sub - daily growth increments, accessory
primordia, secondary growth zones and first feeding check were
found in the otoliths. The juvenile grey mullets arrived the
estuary at the size of 20.56 mm mean TL (approximately 32 days
after hatching), left the estuary at 34.00 mm (62 days). The
duration of estuarine staying was about a month, growth rate was
0.452 mm d-1 during this period. The juveniles in the estuary
were composed of multiple cohorts. Backcalculated spawning
period lasted approximately five months from October through the
following February. This indicated that the juveniles collected
in the Tan - Shui River Estuary were not completely originated
from the migratory spawning stock in the coastal waters off
southwestern Taiwan.
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