Differential feeding by sardine
            <i>Sardinops Sagax</i>
            and anchovy
            <i>Engraulis capensis</i>
            recruits in mixed shoals

Louw, GG; Lingen, Carl D. van der; Gibbons, M. J.

doi:10.2989/025776198784126647

Cited by 21 publications

(8 citation statements)

References 5 publications

(11 reference statements)

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“…Co-schooling fish typically feed on similar prey items (e.g. Louw et al, 1998). The general relation ships observed here show that the intraspecific dietary overlap (between size classes of one species) is lower than the interspecific overlap (between species).…”

Section: Ontogenetic Diet Shiftsmentioning

confidence: 56%

“…regime shifts; out-of-phase fluctuations of these genera have been documented over many centuries in the product ive coastal waters of the Pacific and Atlantic oceans (Baumgartner et al, 1992). Both species are size-selective planktivores, with sardine preferring smaller particles than anchovy (Louw et al, 1998). Alheit and Niquen (2004) report that when large copepods are abundant, anchovies dominate over sardines, such as exempli fied during the anchovy regime of the 1960s in the Humboldt Current off South America.…”

Section: Introductionmentioning

confidence: 99%

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A prey-related shift in the abundance of small pelagic fish in eastern Tasmania?

McLeod

Hobday

Lyle

et al. 2012

ICES Journal of Marine Science

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McLeod, D. J., Hobday, A. J., Lyle, J. M., and Welsford, D. C. 2012. A prey-related shift in abundance of small pelagic fish in eastern Tasmania? – ICES Journal of Marine Science, 69: 953–960. Shifts in the relative abundance of small pelagic fish species have signalled a change in the ocean environment in a number of locations. Here we show that the replacement of jack mackerel, Trachurus declivis, with redbait, Emmelichthys nitidus, as the dominant small pelagic species from eastern Tasmania, following a period of high fishing pressure on jack mackerel, is consistent with altered zooplankton communities and long-term climate change. Stomach contents analysis and morphology measurements were conducted on both species to determine if they were functionally equivalent with regard to zooplankton prey. Diet varied between species and with fish size. Krill (Nyctiphanes australis) was consumed by both species, with redbait feeding more heavily on small copepods. The diet overlap and morphometric characteristics indicated that these species are not equivalent with regard to prey and therefore changes in prey availability may have contributed to the observed shifts in relative abundance. The continued poleward extension of the East Australian Current is expected to favour small warm-water copepods; thus, redbait may have an advantage over jack mackerel due to prey preferences. An increase in relative abundance of redbait has decreased effort in surface fisheries and may impact on surface-feeding higher predators in this region.

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Section: Ontogenetic Diet Shiftsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 99%

A prey-related shift in the abundance of small pelagic fish in eastern Tasmania?

McLeod

Hobday

Lyle

et al. 2012

ICES Journal of Marine Science

View full text Add to dashboard Cite

show abstract

“…Particulate feeding by anchovy is possible even under low-light conditions (O'Connell 1972) and shows marked periodicity with peaks at dawn and dusk (James 1987). Filter feeding is not light dependent and does not show regular periodicity (van der Lingen 1998, Emmett et al 2005.…”

Section: Bioenergetic Modeling Of Sardine and Anchovy Growthmentioning

confidence: 99%

“…Selection of individual prey items by particulate feeding is energetically inefficient in comparison to filter feeding. When presented with similar prey assemblages in the natural environment, items consumed by sardine are distinctly smaller than those consumed by anchovy (Louw et al 1998). An understanding of how the biomass size spectra of phytoplankton and zooplankton assemblages vary with respect to environmental conditions may elucidate the factors influencing production and growth of sardine and anchovy populations.…”

Section: Introductionmentioning

confidence: 99%

Changes in mesozooplankton size structure along a trophic gradient in the California Current Ecosystem and implications for small pelagic fish

Rykaczewski¹

2019

Mar. Ecol. Prog. Ser.

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“…Long-term time series of the abundance of crustacean zooplankton in different size categories are presented for the west coast of South Africa, where anchovy and sardine recruit to the pelagic fishery each year (Crawford et al, 1987). These fish are size-selective planktivores, with sardine preferring smaller particles than anchovy (van der Lingen, 1994;Louw et al, 1998). Two possible causative mechanisms for the observed long-term trends in zooplankton abundance and community size structure, from both a bottom-up and top-down perspective, are explored.…”

Section: Introductionmentioning

confidence: 99%

Long-term increase in crustacean zooplankton abundance in the southern Benguela upwelling region (1951–1996): bottom-up or top-down control?

Verheye¹,

Richardson

1998

ICES Journal of Marine Science

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Since 1951, zooplankton samples have been collected on the shelf along the west coast of South Africa, where pelagic fish recruit each year. Retrospective analysis of collections made during peak recruitment in austral autumn showed a significant increase in the abundance of planktonic crustaceans by two orders of magnitude (from 3.74 10 3 ind.m 2 in 1951 to 7.03 10 5 ind.m 2 in 1996). This long-term increase was accompanied by a shift in the community size structure, which parallelled altered regimes of anchovy and sardine, two size-selective planktivores. The increase in crustacean zooplankton could be related to the observed long-term intensification of coastal upwelling in the region and a reduction in predation by declining stocks of pelagic fish over the past four decades.

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Differential feeding by sardine Sardinops Sagax and anchovy Engraulis capensis recruits in mixed shoals

Cited by 21 publications

References 5 publications

A prey-related shift in the abundance of small pelagic fish in eastern Tasmania?

A prey-related shift in the abundance of small pelagic fish in eastern Tasmania?

Changes in mesozooplankton size structure along a trophic gradient in the California Current Ecosystem and implications for small pelagic fish

Long-term increase in crustacean zooplankton abundance in the southern Benguela upwelling region (1951–1996): bottom-up or top-down control?

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