Rapid digestion of fish prey by the highly invasive ‘detritivore’<i>Oreochromis mossambicus</i>

Doupé, Robert G.; Knott, Matthew J.

doi:10.1111/j.1095-8649.2009.02531.x

Cited by 9 publications

(4 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…O. mossambicus may possibly be a primarily herbivorous or a detritivorous fish (Bruton and Boltt, 1975;Whitfield and Blaber, 1978;De Silva et al, 1984). The high occurrence of detritus reveals a detritivorous feeding nature of the fish (Doupe and Knott, 2010). A similar result of dominance of detritus in the diet of O. mossambicus was reported in Yamuna River in India (Ganie et al, 2013).…”

supporting

confidence: 65%

Food and feeding habits of the exotic fish Oreochromis mossambicus (Peters, 1852) from a tropical reservoir of Chalakudy River, Kerala

Roshni¹,

Renjithkumar²,

Kurup³

2016

Indian J. Fish.

View full text Add to dashboard Cite

The diet composition of the exotic fish, Oreochromis mossambicus (Peters, 1852) was studied in Poringalkuthu Reservoir, Kerala from June 2011 to May 2012. O. mossambicus (2.52 t) forms a regular fishery which indicate that the fish has been established successfully in the reservoir. Gut content analysis revealed detritus to be the dominant food item followed by chlorophyceae, cyanophyceae, bacillariophyceae, zooplankton, plant matter, sand particles, fish parts, insects and miscellaneous items. The present study shows that the species is an omnivore, with a euryphagous feeding habit.

show abstract

supporting

confidence: 65%

Food and feeding habits of the exotic fish Oreochromis mossambicus (Peters, 1852) from a tropical reservoir of Chalakudy River, Kerala

Roshni¹,

Renjithkumar²,

Kurup³

2016

Indian J. Fish.

View full text Add to dashboard Cite

show abstract

“…However, O. mossambicus are known to exhibit trophic plasticity under different environmental conditions (Bowen & Allanson, 1982;Dyer et al, 2013). In Australia, they have been shown to prey on juvenile indigenous fish in both laboratory and field situations (Doup e et al, 2009), and to completely digest fish prey in <1 h leaving little evidence of this food source in stomach contents (Doup e & Knott, 2011). In Sri Lanka, De Silva, Perera & Maitipe (1984) reported O. mossambicus diets ranging from detritivory, to herbivory, to complete carnivory in different reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Piscivory does not cause pansteatitis (yellow fat disease) in Oreochromis mossambicus from an African subtropical reservoir

et al. 2014

View full text Add to dashboard Cite

1. Pansteatitis (yellow fat disease) is ubiquitous in the free-ranging population of Oreochromis mossambicus from Loskop Reservoir (LR), South Africa. The disease is nutritionally mediated and associated with a diet high in polyunsaturated or rancid fats, frequently of fish origin. While piscivory has never been reported in dietary studies of O. mossambicus in their native range, their opportunistic and omnivorous feeding habits mean that piscivory cannot be ruled out as a cause of the disease. 2. The diet of O. mossambicus from LR (n = 91) was compared with a population from Flag Boshielo Reservoir (FBR; n = 81) located <100 km downstream, where no pansteatitis occurs. The stomach contents and stable isotope signatures (d 15 N and d 13 C) of fish and food sources were evaluated across four seasons. Isotope signatures were also compared over various time scales from historic samples and mortalities collected from LR. 3. There was no evidence of piscivorous feeding behaviour in fish from either location or from historic LR samples. The results of the stable isotope analysis in R mixing model and stomach contents analysis showed that the dinoflagellate, Ceratium hirundinella, was the dominant food source followed by zooplankton, detritus and Microcystis aeruginosa in LR. The diet of fish from FBR was less diverse than fish from LR and was dominated by sediment and detritus. 4. The distinguishing feature of the dietary comparison between reservoirs was the abundance of planktonic food items dominated by C. hirundinella in the diet of fish from LR. The lack of evidence for piscivory among O. mossambicus from LR suggests that the classic aetiology of pansteatitis does not apply. This highlights the need to further explore direct (environmental exposure to pollutants) and indirect (dietary exposure) links to pansteatitis. This study identified the major dietary constituents for O. mossambicus, which enables future research to focus on their nutritional and chemical composition.

show abstract

“…However, Carpenter and Mueller (2008) considered the absence of larvae in the gut contents of fishes yielded from field studies as insufficient to conclude that a species is not feeding on fish larvae. The possibility of detecting fish larvae or larval remains in stomach content analyses decreases rapidly within less than an hour post‐consumption due to the rapid digestion of the fragile larvae tissue (Schooley et al., 2008; Doupé and Knott, 2010). Furthermore, it becomes difficult due to mastication and physical destruction of the food items (Schooley et al., 2008), which is common in cyprinid fish species with pharyngeal teeth (Sibbing, 1991; Nagelkerke and Sibbing, 1996; Osse et al., 1997).…”

Section: Discussionmentioning

confidence: 99%

Limited contribution of predation by zooplanktivorous cyprinids to 0+ fish mortality

Schomaker

Wolter

2012

Journal of Applied Ichthyology

View full text Add to dashboard Cite

Predation by zooplanktivorous cyprinids was hypothesized as substantially contributing to larval fish mortality. To test this assumption, potential predators were sampled by electric fishing at sites and times of high fish larvae densities in the lower Oder River, Germany, in 2002 and 2003. At ten sites with high prey fish densities, all fishes ‡1+ and 0+ pike -all considered potentially predating on fish larvae -were captured, anaesthetised, and fixed. In the laboratory, 982 guts, respectively, stomachs were dissected and checked for fish larvae and larvae remains. Predation on 0+ fish was detected in the primary piscivorous fishes Esox lucius L. and Aspius aspius (L.), and facultative piscivorous Perca fluviatilis L., whilst none of the other nine species examined consumed fish. These findings implicate that predation by planktivorous cyprinids did not explain the typically strong decline in larval fish densities in the first weeks after hatching.

show abstract

Rapid digestion of fish prey by the highly invasive ‘detritivore’Oreochromis mossambicus

Cited by 9 publications

References 30 publications

Food and feeding habits of the exotic fish Oreochromis mossambicus (Peters, 1852) from a tropical reservoir of Chalakudy River, Kerala

Food and feeding habits of the exotic fish Oreochromis mossambicus (Peters, 1852) from a tropical reservoir of Chalakudy River, Kerala

Piscivory does not cause pansteatitis (yellow fat disease) in Oreochromis mossambicus from an African subtropical reservoir

Limited contribution of predation by zooplanktivorous cyprinids to 0+ fish mortality

Contact Info

Product

Resources

About