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Food of blueback herring and threadfin shad in Jocassee Reservoir, South Carolina

Transactions of the American Fisheries Society

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Abstract

Threadfin shad Dorosoma petenense and blueback herring Alosa aestivalis were introduced into Jocassee Reservoir, South Carolina, in the early 1970s as prey for large piscivores. To assess the potential for trophic competition between these clupeids, we examined their diets and the extent of diet overlap in May, August, and December 1982 and February 1983. The diet of blueback herring consisted mainly of large species of cladocerans and copepods supplemented in August with Chaoborus punctipennis and young fish. Mean length of the organisms eaten by blueback herring was 1.4 mm. Threadfin shad fed on smaller species of cladocerans and copepods, as well as on rotifers and copepod nauplii. The mean length of the organisms eaten by threadfin shad was 0.4 mm, which differed significantly from the mean length of the zooplankton population in Jocassee Reservoir (0.6 mm). Phytoplankton contributed 24 and 32% of the stomach contents of threadfin shad in August and December. Bosmina longirostris was important in the diet of both species, although blueback herring showed negative selection for it. Diet overlap between the two clupeids was low on all four dates. Although we found no evidence of trophic competition between the two species in Jocassee Reservoir, we do not recommend stocking them together, because both species are voracious planktivores and blueback herring are piscivorous.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Food of blueback herring and threadfin shad in Jocassee Reservoir, South Carolina
Series title:
Transactions of the American Fisheries Society
Volume
120
Issue:
5
Year Published:
1991
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 605-613
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Transactions of the American Fisheries Society
First page:
605
Last page:
613
Number of Pages:
8