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Migrations, growth, and early life h...

Cieri, Matthew D.

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Migrations, growth, and early life history of the American eel (Anguilla rostrata) (Anguilla rostrata).

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Migrations, growth, and early life history of the American eel (Anguilla rostrata) (Anguilla rostrata)./
作者:	Cieri, Matthew D.
面頁冊數:	117 p.
附註:	Adviser: James D. McCleave.
Contained By:	Dissertation Abstracts International61-01B.
標題:	Agriculture, Fisheries and Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9958682
ISBN:	0599620420

Migrations, growth, and early life history of the American eel (Anguilla rostrata) (Anguilla rostrata).
Cieri, Matthew D.

Migrations, growth, and early life history of the American eel (Anguilla rostrata) (Anguilla rostrata). - 117 p.

Adviser: James D. McCleave.

Thesis (Ph.D.)--University of Maine, 1999.

The American eel is a catadromous species with spawning and early larval growth occurring off-shore. Because collection of larvae and juveniles is difficult, many studies use otoliths to investigate early life. However, use of otoliths requires understanding of the pitfalls of this technique.

ISBN: 0599620420Subjects--Topical Terms:

1020913
Agriculture, Fisheries and Aquaculture.

Migrations, growth, and early life history of the American eel (Anguilla rostrata) (Anguilla rostrata).
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245 1 0 $a Migrations, growth, and early life history of the American eel (Anguilla rostrata) (Anguilla rostrata).
300 $a 117 p.
500 $a Adviser: James D. McCleave.
500 $a Source: Dissertation Abstracts International, Volume: 61-01, Section: B, page: 0133.
502 $a Thesis (Ph.D.)--University of Maine, 1999.
520 $a The American eel is a catadromous species with spawning and early larval growth occurring off-shore. Because collection of larvae and juveniles is difficult, many studies use otoliths to investigate early life. However, use of otoliths requires understanding of the pitfalls of this technique.
520 $a This research examined the early life history of the American eel using otoliths and more traditional measures. The specific objectives were to: describe <italic> Anguilla</italic>'s otolith morphology; determine if otoliths accurately record past life history events; validate increment deposition during estuarine residency; and determine whether eels use estuaries as areas of feeding and growth.
520 $a Otoliths could be a powerful aid for resolving <italic>Anguilla</italic>'s early life history. However, conflicting information, the possibility of resorption during metamorphosis, and the unknown increment deposition rate during larval life, suggest that direct back-calculation of spawning date is unwarranted.
520 $a To use otoliths, the increment deposition rate must be known, otoliths must accurately record past life history, and there must be no resorption. Leptocephali and glass eels were collected and their otoliths examined. Results suggested a size and increment discrepancy which can only be explained by resorption. Therefore, it is inappropriate to use otoliths to investigate the early oceanic life history of this species.
520 $a Otolith increments are useful in determining age of larval and juvenile fishes. It was assumed that deposition of increments occurs daily for glass eels and that the transition ring marks the entrance to fresh water. Glass-phase American eels were collected and the increment deposition experimentally determined. Increments were deposited daily for glass eels. During experimentation, deposition of the transition ring was documented at high salinities. This observation suggested that the transition ring does not mark first entrance to fresh water.
520 $a It was previously assumed that estuaries served only as migratory conduits for glass eels and not as areas of feeding and growth. To test this assumption, glass eels were collected from upstream and downstream sites in the Kennebec and Damariscotta Estuaries; residence time was estimated; and feeding, growth and development assessed. Significant increases in feeding, growth, development, and residence time suggests that estuaries are used as areas of feeding and growth.
590 $a School code: 0113.
650 4 $a Agriculture, Fisheries and Aquaculture. $3 1020913
650 4 $a Biology, Oceanography. $3 783691
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690 $a 0792
710 2 0 $a University of Maine. $3 1253247
773 0 $t Dissertation Abstracts International $g 61-01B.
790 $a 0113
790 1 0 $a McCleave, James D., $e advisor
791 $a Ph.D.
792 $a 1999
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