The food and feeding of Etrumeus whiteheadi Wongratana 1983, off the Cape Province of South Africa

 

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dc.contributor.advisor Field, John G en_ZA
dc.contributor.advisor Brownell, Charles L en_ZA
dc.contributor.author Wallace-Fincham, Beverley Pastorah en_ZA
dc.date.accessioned 2016-09-29T17:15:48Z
dc.date.available 2016-09-29T17:15:48Z
dc.date.issued 1987 en_ZA
dc.identifier.citation Wallace-Fincham, B. 1987. The food and feeding of Etrumeus whiteheadi Wongratana 1983, off the Cape Province of South Africa. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/22016
dc.description Bibliography: pages 70-74. en_ZA
dc.description.abstract Feeding of the redeye roundherring Etrumeus whiteheadi Wongratana 1983, was investigated off the west and south coasts of the Cape Province of South Africa. Fish from the west coast were collected in April and May 1984, those from the south coast during November 1983 and 1984. Diet was determined from stomach contents. Dry mass and numbers of food items are presented. Copepods were the principal food off the south coast, constituting a mean of 67% (range: 60-75%) by mass of gut contents in juveniles, a mean of 59% (range 44-88%) in the transitional juvenile/adult size class and a mean of 43% (range: 30-73%) by mass in the adults. Adult and larval stages of euphausiids were also an important dietary component of these fish, comprising a mean of 10% (range: 0-18%) by mass in the juveniles, a mean of 14% (range: 7-18%) in the transitional juvenile/adult size class and a mean of 52% (range: 27-63%) by mass in the adults. On the west coast chaetognaths appeared to be the principal food item of the juvenile fish examined, yielding values as high as 99% by mass. Other less important prey in both areas included cladocerans, ostracods, fish eggs, pteropods, bivalve larvae, squid and juvenile fish. Phytoplankton formed a negligible component of the diet. It was present in minute quantities in the west coast fish only. Diurnal feeding patterns were investigated for both areas. Total mass of stomach contents constituted a maximum of 1.2% of total fish mass off the south coast in November 1983, and a maximum of 0.85% in November 1984. Off the west coast, where juveniles only were sampled, the stomach content mass made up to 7% of body mass. Stomachs were fullest in the afternoon and early evening and it is inferred that feeding takes place during daylight hours. Predator-prey size relationships were investigated using two methods. The first method involved testing the correlation between fish mass and prey mass and the second employed Ursin's procedure using predator-prey mass ratios. Predator size was found to have a small effect on diet composition. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title The food and feeding of Etrumeus whiteheadi Wongratana 1983, off the Cape Province of South Africa en_ZA
dc.type Thesis / Dissertation en_ZA
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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