An outline on lateral fish migrations within the Central Delta of the Niger River, Mali

Bénech, Vincent; Peňáz, M.

doi:10.1007/bf00034052

Cited by 22 publications

(14 citation statements)

References 2 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The high concentrations of inorganic materials in the stomach contents confirm the low trophic potential of the pond during this period. During the wet season, the more favorable ecological conditions (rise in water level, greater water transparency) drive the lateral migrations (from the river to the ponds) so decisive to fish survival (Benech and Penaz, 1995). During this flood season, the floodplain is inundated, triggering the mobilization and availability of the nutritive reserves that had accumulated in the pond sediment.…”

Section: Discussionmentioning

confidence: 99%

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Ble

Arfi

2009

Knowl. Managt. Aquatic Ecosyst.

View full text Add to dashboard Cite

Key-words: omnivorous fish, natural food, nutritive value, climate, Batamani Pond, MaliThe chemical composition of the stomach contents and the digestibility of organic matter, proteins and energy of three planktivorous fish species (Oreochromis niloticus, Sarotherodon galilaeus and Citharinus citharus) were studied in Batamani Pond (Mali, West Africa) during the dry and wet seasons. The diet contents of O. niloticus and S. galilaeus presented high levels of organic matter and proteins during the wet season (ashfree dry weight (AFDW): 753 mg·g −1 dw and 703 mg·g −1 dw, protein contents: 479 mg·g −1 AFDW and 449 mg·g −1 AFDW, respectively). In the dry season, the chemical composition of the food was characterized by high proportions of inorganic material (73% and 68% for O. niloticus and S. galilaeus, respectively). The chemical composition of the food of C. citharus was characterized by low seasonal variation. The levels of AFDW (396-461 mg·g −1 dw) and proteins (65-86 mg·g −1 AFDW) in its diet were generally low, reflecting a high proportion of mineral content. During the wet season, the digestibility of AFDW (52% and 58%), total amino acids (68% and 76%) and energy (63% and 56%) increased significantly for O. niloticus and S. galilaeus, respectively. Nutrient and energy digestibility for C. citharus showed no significant seasonal variations (AFDW: 36-45%; total amino acids: 57-64%; energy: 31-39%). The marked seasonal character of the pond, in terms of both hydrology and trophic conditions, had a low impact on the availability and quality of nutritive resources for the two tilapia species O. niloticus and S. galilaeus, while C. citharus appears to have the capacity to adapt its regime to the available food quality, whatever the season.

show abstract

Section: Discussionmentioning

confidence: 99%

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Ble

Arfi

2009

Knowl. Managt. Aquatic Ecosyst.

View full text Add to dashboard Cite

show abstract

“…This notion is supported indirectly by studies of lateral movements in systems where connectivity is controlled by seasonal riverlevel variability (e.g. Bénech and Peñáz, 1995;Hohausova et al, 2003;Castello, 2008), and directly by Lyon et al (2010), who describes similar two-way movements when river and wetland water levels stabilize in the middle reaches of the Murray.…”

Section: Importance Of Lateral Movementsmentioning

confidence: 94%

Offstream movements of fish during drought in a regulated lowland river

Conallin¹,

Hillyard²,

Walker³

et al. 2011

River Research & Apps

View full text Add to dashboard Cite

Access to offstream habitats is vital for many freshwater fish, but details of their lateral movements are scarce. We describe the movements of fish between the channel of the River Murray and six perennially inundated wetlands in South Australia from August to November 2006. At this time there were unprecedented low flows in the river owing to the combined effects of river regulation, drought and over-allocation to upstream users. Some 210 000 fish from 18 species (14 native, 4 alien) were recorded, including two uncommon native species listed by conservation agencies. Movements of juveniles and adults varied among wetlands despite the shared river reach and the proximity of the wetlands to each other, but showed no consistent directionality. This may reflect the prevailing low-flow conditions, the virtually permanent connections between the wetlands and channel maintained by weirs, levees and barrages, and the dominance of 'generalist' species. We speculate that movements facilitate efficient resource utilization and nutrient exchange between homogenized river and wetland habitats in the absence of the flood-pulse. We anticipate directional movements will become apparent when flows are increased, so that our data could provide a comparative baseline for future studies. As modifications to natural flow paths may impede access to/from wetlands by fish and other aquatic fauna, provisions for access should be incorporated into flowcontrol structures, used locally to manipulate wetland hydrology.

show abstract

“…Seasonally flooded habitats offer contrasted ecological features for fish populations. The use of such habitats by fish is considered to be important usually in terms of population dynamics because of the role of these habitats as breeding and nursery areas (Lowe-McConnell, 1975;Guillory, 1979;Bénech & Quensière, 1982;Copp, 1989;Bénech & Peñ as, 1995). Fish population densities are often low in such habitats (Crivelli, 1981;Pont et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

Use of seasonally flooded marshes by fish in a Mediterranean wetland: timing and demographic consequences

Poizat

Corivelli

1997

Journal of Fish Biology

View full text Add to dashboard Cite

In the Camargue (southern France), movements of fish between a canal and two seasonally flooded marshes were monitored continuously by fish traps for 3 years for one marsh and for 2 years for the other. The timing of the entry and exit of the main species was determined together with species annual demographic balance, defined as the difference between the number of fish leaving and the number of fish entering. Only some of the species inhabiting the canal colonized the marshes. Except those species that reproduced in salt or brackish waters, all the species colonizing the marshes reproduced in it. The most abundant of these species were small sized (mosquitofish, sand smelt and three-spined stickleback). The unpredictability of water levels in summer was particularly unfavourable for recruitment and survival of species that breed late in the year, e.g. pumpkinseed sunfish, or which prolonged their stay in the marsh and only attempted to leave just before the connection was broken, e.g. carp. Only the three-spined stickleback always had a positive demographic balance as a result of colonizing the marshes. Adults of this species entered in winter and young-of-the-year left in April. By limiting its stay in the seasonally flooded marshes, the stickleback minimized the risks related to environmental unpredictability. These results suggest that hydrology (temporal variations of water depth) may influence the fish community structure through interspecific differences in survival and recruitment, as a result of temporal variations in the use of seasonally flooded marshes.

show abstract

An outline on lateral fish migrations within the Central Delta of the Niger River, Mali

Cited by 22 publications

References 2 publications

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Seasonal effects on the nutritive value of the natural food of three omnivorous fish (Oreochromis niloticus,Sarotherodon galilaeus,Citharinus citharus) in Batamani Pond (Mali, West Africa)

Offstream movements of fish during drought in a regulated lowland river

Use of seasonally flooded marshes by fish in a Mediterranean wetland: timing and demographic consequences

Contact Info

Product

Resources

About