Larval Feeding of Scomber japonicus (Pisces: Scombridae) in the Gulf of California and Its Relation to Temperature and Chlorophyll Satellite Data
Larval Feeding of Scomber japonicus (Pisces: Scombridae) in the Gulf of California and Its Relation to Temperature and Chlorophyll Satellite Data
Date
2000-04
Authors
Sanchez-Velasco, Laura
Shirasago, Bernardo
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University of Hawai'i Press
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Abstract
Feeding habits of Scomber japonicus larvae in the central part of
the Gulf of California during April 1984 and 1985 are described and compared.
Satellite images of temperature and chlorophyll monthly average showed that
the central gulf during April 1984 was relatively warmer but with lower chlorophyll
concentration than during April 1985. Feeding incidence was lower in larvae
collected in April 1984 than in larvae in April 1985. Prey size consumed
was larger in larvae in 1984 than in larvae in 1985. The cladoceran Penilia sp.,
copepod nauplii, and appendicularians were the dominant prey in the diet of
larvae in 1984. In 1985 diatoms and copepod nauplii were the dominant prey.
The high incidence of diatoms in S. japonicus larvae collected in 1985, a cold
year, corresponded to the high chlorophyll concentration observed by satellite.
Diatoms were not an important component in the larval diet in 1984, when the
chlorophyll concentration was low. A high incidence of the cladoceran Penilia
sp. in the larval gut in 1984 coincided with cladoceran blooms recorded
in years affected by El Nino events. Interannual difference in feeding habits of
S. japonicus larvae can be associated with changes in environmental conditions,
such as temperature and chlorophyll concentration.
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Sanchez-Velasco L, Shirasago B. 2000. Larval feeding of Scomber japonicus (Pisces: Scombridae) in the Gulf of California and its relation to temperature and chlorophyll satellite data. Pac Sci 54(2): 127-136.
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