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VERTICAL MIGRATIONS AND NET AVOIDANC...

CASTONGUAY, MARTIN.

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VERTICAL MIGRATIONS AND NET AVOIDANCE OF ANGUILLA AND OTHER COMMON LEPTOCEPHALI FROM THE SARGASSO SEA, AND A MICROSTRUCTURAL ANALYSIS OF ANGUILLA OTOLITHS.

Record Type:	Electronic resources : Monograph/item
Title/Author:	VERTICAL MIGRATIONS AND NET AVOIDANCE OF ANGUILLA AND OTHER COMMON LEPTOCEPHALI FROM THE SARGASSO SEA, AND A MICROSTRUCTURAL ANALYSIS OF ANGUILLA OTOLITHS./
Author:	CASTONGUAY, MARTIN.
Description:	90 p.
Notes:	Source: Dissertation Abstracts International, Volume: 47-04, Section: B, page: 1369.
Contained By:	Dissertation Abstracts International47-04B.
Subject:	Biology, Oceanography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8614141

VERTICAL MIGRATIONS AND NET AVOIDANCE OF ANGUILLA AND OTHER COMMON LEPTOCEPHALI FROM THE SARGASSO SEA, AND A MICROSTRUCTURAL ANALYSIS OF ANGUILLA OTOLITHS.
CASTONGUAY, MARTIN.

VERTICAL MIGRATIONS AND NET AVOIDANCE OF ANGUILLA AND OTHER COMMON LEPTOCEPHALI FROM THE SARGASSO SEA, AND A MICROSTRUCTURAL ANALYSIS OF ANGUILLA OTOLITHS. - 90 p.

Source: Dissertation Abstracts International, Volume: 47-04, Section: B, page: 1369.

Thesis (Ph.D.)--The University of Maine, 1985.

The main objectives of the first part of this dissertation were to determine and compare daytime and nighttime vertical distributions of Anguilla leptocephali and of other common leptocephali and to analyze the ontogenetic changes in the vertical distributions. A related objective was to assess the time of ascent and descent of leptocephali in relation to sunset and sunrise. I also developed an index of net avoidance by leptocephali.Subjects--Topical Terms:

783691
Biology, Oceanography.

VERTICAL MIGRATIONS AND NET AVOIDANCE OF ANGUILLA AND OTHER COMMON LEPTOCEPHALI FROM THE SARGASSO SEA, AND A MICROSTRUCTURAL ANALYSIS OF ANGUILLA OTOLITHS.
LDR:02992nmm 2200253 4500 001 1835802
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008 130610s1985 d
035 $a (UMI)AAI8614141
035 $a AAI8614141
040 $a UMI $c UMI
100 1 $a CASTONGUAY, MARTIN. $3 1924425
245 1 0 $a VERTICAL MIGRATIONS AND NET AVOIDANCE OF ANGUILLA AND OTHER COMMON LEPTOCEPHALI FROM THE SARGASSO SEA, AND A MICROSTRUCTURAL ANALYSIS OF ANGUILLA OTOLITHS.
300 $a 90 p.
500 $a Source: Dissertation Abstracts International, Volume: 47-04, Section: B, page: 1369.
502 $a Thesis (Ph.D.)--The University of Maine, 1985.
520 $a The main objectives of the first part of this dissertation were to determine and compare daytime and nighttime vertical distributions of Anguilla leptocephali and of other common leptocephali and to analyze the ontogenetic changes in the vertical distributions. A related objective was to assess the time of ascent and descent of leptocephali in relation to sunset and sunrise. I also developed an index of net avoidance by leptocephali.
520 $a I studied the vertical distribution of leptocephali during five cruises in the Sargasso Sea with an opening-closing 2-m ring net, which was used to sample in random order, discrete depth strata between the surface and 350 m. No difference in vertical distribution was ever found between Anguilla rostrata and A. anguilla. In contrast to Anguilla < 5 mm, larger Anguilla performed a diel vertical migration. Anguilla of the length range 5.0-19.9 mm mostly occurred between 100 m and 150 m by day and between 50 m and 100 m by night. Anguilla (GREATERTHEQ) 20 mm were found between 125 m and 275 m by day, and mostly between 30 m and 70 m by night. Although Nemichthys scolopaceus < 80 mm did not perform a vertical migration, larger specimens did. Most were caught below 100 m by day and above 100 m by night. I observed a distinct vertical migration in Derichthys serpentinus (125 m to 150 m by day and 30 m to 70 m by night). The other common species of leptocephali were mostly found in the upper 100 m at night. The ascent of leptocephali occurred faster than the descent. A high index of visual avoidance by day was calculated in leptocephali species, excluding Anguilla.
520 $a Results of a microstructural analysis of otoliths of Anguilla leptocephali using a scanning electron microscope are presented in the second part of this dissertation. Assuming that one growth increment was laid every day, I calculated a growth rate of 0.38 mm/day. This growth rate seems too high, considering the interval between peak spawning and metamorphosis. Hatching dates of a subsample of larvae were about 21 May. This late date may be explained by the small size and the geographic location of the larvae.
590 $a School code: 0113.
650 4 $a Biology, Oceanography. $3 783691
690 $a 0416
710 2 $a The University of Maine. $3 1029373
773 0 $t Dissertation Abstracts International $g 47-04B.
790 $a 0113
791 $a Ph.D.
792 $a 1985
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8614141