Vecchione, M. and G.R. Gaston1985
In situ observations on the small-scale distribution of juvenile squids (Cephalopoda: Loliginidae) on the northwest Florida shelf.
Vie Milieu, vol. 35(3/4): 231-235.
ABSTRACT: We examined 38 hours of videotapes recorded with a remote-controlled submersible at about 60 m depth on the northwest Florida continental shelf. Juvenile squids were among the most abundant organisms identified on the tapes. The larger individuals were identifiable as Loligo sp. Whereas behavior typical of obligate schooling was seen in adult Loligo in the tapes, the juveniles seldom were aggregated on a small scale (metres) and did not often appear to "orient" together. Consistent variability was noted, however on a larger scale of hundreds of metres. Variability in numbers of sightings along standardized sections of transects was usually independent of the total number of sightings per transect. Thus, as abundance increased, relative variability decreased. The juveniles seemed to be most abundant very near the bottom at night but were rarely seen during the day. While there are many advantages in working with videotaped observations from submersibles, problems remain to be resolved. These problems include standardization of submersible operation among different operators, identification of specimens, determination of size, and estimation of sightings per unit of effort.
|An aggregation of three of medium-sized juvenile squids near the bottom.|
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MPEG video (606 Kb)
|Large individual schooling with carangid fishes in the lights of the submersible.|
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MPEG video (799 Kb)
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