Impact of fertilization and stocking on trophic interactions and growth of juvenile sockeye salmon (Oncorhynchus nerka)
Mazumder, A.; Edmundson, J.A. (2002). Impact of fertilization and stocking on trophic interactions and growth of juvenile sockeye salmon (Oncorhynchus nerka). Can. J. Fish. Aquat. Sci. 59(8): 1361-1373. https://dx.doi.org/10.1139/F02-111
In: Canadian Journal of Fisheries and Aquatic Sciences = Journal canadien des sciences halieutiques et aquatiques. National Research Council Canada: Ottawa. ISSN 0706-652X; e-ISSN 1205-7533, meer
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Alaska
Countries > Developed countries > Oecd countries > North america > Usa > Western states of usa > Pacific states of usa > Alaska
Developmental stages > Juveniles
INE, USA, Alaska
Population functions > Growth
Reproduction > Sexual reproduction > Biological fertilization
Sockeye salmon
Stocking density
Oncorhynchus nerka (Walbaum, 1792) [WoRMS]
Marien/Kust; Brak water; Zoet water |
| Auteurs | | Top |
- Mazumder, A.
- Edmundson, J.A.
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| Abstract |
Using 16 years of data on nutrients, plankton, and sockeye fry and smolts from Packers Lake, Alaska, we test the impact of nutrients and fry stocking on the growth and productivity of juvenile sockeye salmon (Oncorhynchus nerka). To enhance sockeye production, this lake was fertilized (1983-1996) and stocked annually (1987-1996) with sockeye fry. Before fertilization, the density of sockeye fry was low (<0.20 fry·m-2), the size and biomass of Daphnia were low, and sockeye smolts were relatively small. Before stocking, all trophic levels responded positively to fertilization. The biomass and mean size of Daphnia increased significantly. The average size of age-1 and age-2 smolts increased three- to four-fold. Fry stocking produced dramatic declines in both biomass and mean length of Daphnia and in size of smolts. When large-sized (>1 mm) Daphnia were significantly reduced in density under heavy predation by sockeye fry, the growth of juvenile sockeye declined, even under continued fertilization. We show that fry density and associated food web structure are major determinants of juvenile sockeye responses to fertilization and stocking. This study probably provides the first long-term experimental results linking limnological and nutrient - food web concepts to trophodynamics and productivity of juvenile sockeye salmon. |
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