Environmental induction of natural spawning in Gymnarchus niloticus (Cuvier 1829) in an earthen pond

Oladosu, G.A.

doi:10.1046/j.1365-2109.1997.00903.x

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…intra‐specific resource competition, inter‐specific trophic interactions and availability of spawning substratum) that can greatly differ between sites and species, resulting in reduced spatial synchrony. For example, in order to protect their territory, attract potential mates and finally spawn, equilibrium species need some kind of solid substrate that allows them to build different kinds of nests: Oreochromis aureus , Tilapia species, Sarotherodon multifasciatus , Pelvicachromis pulcher and Protopterus annectens build burrows on different substrates (Whyte 1975, Trewavas 1983, Martin and Taborsky 1997, Tweddle et al 1998, Lévêque and Paugy 1999); Auchenoglanis occidentalis accumulates bivalve shells and gravels to build their nests (Ochi et al 2001); Gymnarchus niloticus makes floating nest by uprooting and gathering aquatic weeds (Lévêque and Paugy 1999, Oladosu 1997); Hepsetus odoe produces foam‐bubble nests among emergent reeds and sedges (Merron et al 1990); and Hemichromis fasciatus and Chrysichthys species look for stone cavities or pieces of wood to spawn in (Whyte 1975, Oteme et al 1996).…”

Section: Discussionmentioning

confidence: 99%

Life history strategies affect climate based spatial synchrony in population dynamics of West African freshwater fishes

Tedesco¹,

Hugueny²

2006

Oikos

View full text Add to dashboard Cite

Spatial synchrony in species abundance is a general phenomenon that has been found in populations representing virtually all major taxa. Dispersal among populations and synchronous stochastic effects (the so called “Moran effect”) are the mechanisms most likely to explain such synchrony patterns. Very few studies have related the degree of spatial synchrony to the biological characteristics of species. Here we present a case where specific predictions can be made to relate river fish species characteristics and synchrony determined exclusively by a Moran effect through the expected sensitivity of species to the regional component of environmental stochasticity. By analyzing 23‐year time series of abundance estimates in two isolated localities we show that species associated with synchronized reproduction during the wet season, high fecundity, small egg size and high gonado‐somatic index (the so called “periodic” strategy) have a higher degree of spatial synchrony in population dynamics than species associated with the opposite traits (the so called “equilibrium” strategy). This is supported by significant relationships (P values <0.01) between species traits and the levels of synchrony after removing taxonomical relatedness. Spatial synchrony computed from summed annual total catches by groups of species, separated into strategy types also showed a significantly higher degree of synchrony for the periodic (r=0.83) than the equilibrium (r=0.46) group. Regional hydrological variability is likely to be partly responsible for the observed synchrony pattern and a regional discharge index showed better relationships with the periodic group, supporting the expected differential effect of regional environmental correlation on population dynamics.

show abstract

Section: Discussionmentioning

confidence: 99%

Life history strategies affect climate based spatial synchrony in population dynamics of West African freshwater fishes

Tedesco¹,

Hugueny²

2006

Oikos

View full text Add to dashboard Cite

show abstract

A review of the reproductive biology of mormyroid fishes: An emerging model for biomedical research

Saunders,

Gallant

2024

J Exp Zool Pt B

View full text Add to dashboard Cite

Mormyroidea is a superfamily of weakly electric African fishes with great potential as a model in a variety of biomedical research areas including systems neuroscience, muscle cell and craniofacial development, ion channel biophysics, and flagellar/ciliary biology. However, they are currently difficult to breed in the laboratory setting, which is essential for any tractable model organism. As such, there is a need to better understand the reproductive biology of mormyroids to breed them more reliably in the laboratory to effectively use them as a biomedical research model. This review seeks to (1) briefly highlight the biomedically relevant phenotypes of mormyroids and (2) compile information about mormyroid reproduction including sex differences, breeding season, sexual maturity, gonads, gametes, and courtship/spawning behaviors. We also highlight areas of mormyroid reproductive biology that are currently unexplored and/or have the potential for further investigation that may provide insights into more successful mormyroid laboratory breeding methods.

show abstract

Diversification of farmed fish species: A means to increase aquaculture production in Nigeria

Oboh

2022

Reviews in Aquaculture

View full text Add to dashboard Cite

Aquaculture produces about half the fish consumed globally and is the fastest‐growing food sector. In Africa, fish is one of the major sources of animal protein, and although the need for increased production of farmed fish to make up for the decline in capture fisheries is acknowledged, efforts put into aquaculture in the continent have not yielded commensurate results. The success recorded in aquaculture in Nigeria is based on the production of the African catfish. However, a high level of production and resilience within the aquaculture sector has been shown to be positively correlated with the culture of several species or species items. Thus, enhanced diversification of species and farming systems may boost aquaculture in Nigeria, as diversification of farming systems would allow optimum utilization of the abundant natural resources in the country. Many indigenous fish species that can be domesticated for culture have been identified. A great deal of scientific research and collaboration between major stakeholders, including the government, private industries, research institutions, and researchers, is required, so the production of these species can thrive like the already farmed catfish in Nigeria. As the successful domestication of any fish species takes a lot of time, effort, and resources, the species that have already proven to some extent to thrive in Nigeria, should be explored first. It is recommended that the best strategy for diversification of aquaculture for Nigeria is to increase the use of some already farmed species and the employment of a variety of production systems.

show abstract

Environmental induction of natural spawning in Gymnarchus niloticus (Cuvier 1829) in an earthen pond

Cited by 3 publications

References 0 publications

Life history strategies affect climate based spatial synchrony in population dynamics of West African freshwater fishes

Life history strategies affect climate based spatial synchrony in population dynamics of West African freshwater fishes

A review of the reproductive biology of mormyroid fishes: An emerging model for biomedical research

Diversification of farmed fish species: A means to increase aquaculture production in Nigeria

Contact Info

Product

Resources

About