The present work is an attempt to correlate information collected
in the northern part of Chile with the anchoveta distribution and its
fluctuation. This information was collected over a three year period
(November 1967 to November 1970) by the Instituto de Fomento Pesquero,
Chile (IFOP).
The first and second part represent an exhaustive review of the
biology of the species and the principal oceanographic features of its
habitat. It is based upon several years of research conducted by the
Instituto de Fomento Pesquero in Chile, the Instituto del Mar del Peru
in Peru, and other institutions. Results of these studies are reported
through 1972, providing the necessary background for the discussion presented
in later chapters.
In part three the information collected during the three year period
by IFOP is presented. Seasonal average maps of temperature, salinity,
transparency, fish distribution, volume of zooplankton, eggs and larvae
of anchoveta are presented and discussed. Oxygen and temperature sections
are also presented in relation to school distribution,
The final part is entirely devoted to a discussion of outstanding
features of the interrelationship of the anchoveta to the environment
that is found in the region. The effect of temperature appears to be
important in the fish distribution and may be responsible for the major
concentrations during summer months that result in higher catches by
the fishing fleet. Oxygen appears to be of primary importance in the
seasonal fluctuations. When upwelling takes place, especially during
winter, water with a low oxygen content from the Peru-Chile Undercurrent
is brought to the surface forcing the anchoveta to migrate to the
west away from the coastal areas. The effect of a highly saline and
warm oceanic front may also affect fish distribution. The effect of all
these could also affect eggs and larval survival, but the relationships
are not clear.
The bibliography at the end of the work is a complete bibliographical
review on the subject and will be used for further studies in
anchoveta off Peru and Chile. / Graduation date: 1973
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/28269 |
| Date | 06 December 1972 |
| Creators | Canon, Jose Raul |
| Contributors | McCauley, James E. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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