Seasonal histological and macroscopic changes in the gonads of<i>Cheimerius nufar</i>(Ehrenberg, 1820) (Sparidae: Pisces)

Coetzee, P.S.

doi:10.1080/02541858.1983.11447819

Cited by 27 publications

(26 citation statements)

References 22 publications

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“…The higher CPUE found in winter was expected as most sparids spawn between spring and summer (Brownell 1979, Coetzee 1983, Buxton 1987, van der Elst 1993, Brouwer and Griffiths 2005, Fairhurst et al 2007) and build up fat reserves in winter (Wootton 1999). In our study, standardised angling consistently yielded higher mean sizes during seasons of lower CPUE values.…”

Section: Ancillary Factorssupporting

confidence: 69%

Effects of fishing on a temperate reef community in South Africa 1: ichthyofauna

Götz

Kerwath²,

Attwood

et al. 2009

African Journal of Marine Science

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Exploitation of temperate reef fish not only affects the target species but potentially changes the composition of reef fish assemblages. This study investigated the effect of fishing on the ichthyofaunal community at protected and exploited sites around the Goukamma Marine Protected Area (MPA) on the South African temperate south coast. Abundance and size frequency data from 273 standardised angling and 44 underwater visual census sites were analysed with generalised linear modelling and multivariate techniques to separate the effects of exploitation, habitat, time of day and season. Ichthyofaunal communities differed significantly between protected and exploited sites, which is likely a result of differential fishing pressure. Abundance and size of roman Chrysoblephus laticeps, the dominant species of the local linefishery, were significantly lower at exploited sites. Non-target species with considerable dietary overlap with roman were significantly less abundant inside the MPA, probably due to interspecific competition, whereas species whose diets differed to that of roman were more abundant at protected sites. The results show that fishing can have an influence on the composition of target and non-target species and that these effects need to be considered in fisheries management and conservation planning.

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Section: Ancillary Factorssupporting

confidence: 69%

Effects of fishing on a temperate reef community in South Africa 1: ichthyofauna

Götz

Kerwath²,

Attwood

et al. 2009

African Journal of Marine Science

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“…Recent work in southern African waters has shown that several commercially exploited spat-ids change sex during their lives (Hecht & Baird 1977, Garratt 1986, Buxton 1989 and that many others, including C. nufar (Coetzee 1983), are rudimentary hermaphrodites (Buxton & Garratt 1990). Buxton & Garratt (op.…”

Section: Introductionmentioning

confidence: 97%

Spawning behaviour ofCheimerius nufar in captivity

Garratt

1991

Environ Biol Fish

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SynopsisThe santer Cheimerius nufar is widespread in tropical and subtropical waters of the western Indian Ocean and forms an important component of linefish catches along the east coast of southern Africa. Observations of spawning behaviour in captivity have revealed that spawning occurs during spring over a period of four months. Mating takes place at sunrise and may continue for up to 105 min (mean duration = 60 min). During spawning males become dark with prominent white markings. They become very aggressive and set up territories. Females remain a uniform silvery-pink. Mating occurs between males and females of similar sizes, culminating in egg and sperm release near the surface. Individual fish spawned up to 14 times during a morning. 'Streaking' occurred throughout the season, with a second male joining a spawning pair and releasing gametes simultaneously. Slinger, Chrysoblephus puniceus, a dominant fish on offshore reefs in the same region, interfered with spawning throughout the season and were observed to eat eggs when they were released. The spawning strategy of C. nufar is similar to protogynous species in several respects, indicating that this functional gonochorist may not conform to current theoretical predictions.

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“…At the family, genus and species levels, the spawning month of sparids tends to deviate less and less from the months of minimum SST and minimum photoperiod with increases in mean SST and decreases in latitude. At higher latitudes various species of sparids spawn at all times of the year, with peak spawning for some species (e.g., Cheimerius nufar for the Port Elizabeth area of South Africa) correlating with maximum sea temperatures and day length (Coetzee 1983). In addition, some individual species (e.g., Pachymetopon blochii in the Cape Town area) spawn year round (Pulfrich and GriYths 1988).…”

Section: Discussionmentioning

confidence: 99%

Is the timing of spawning in sparid fishes a response to sea temperature regimes?

Sheaves

2006

Coral Reefs

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Published spawning seasons of sparid Wsh were investigated to determine if there were consistent patterns that could be related to large-scale physical variability, and whether these relationships were species-speciWc or characteristic of higher taxonomic groupings. For individual species, genera and the family Sparidae as a whole, there was a consistent pattern; spawning at lower latitudes was concentrated close to the month of lowest sea surface temperature, while spawning at higher latitudes was more variable with greater deviations from the month of minimum sea surface temperature. The distribution of sparids may be limited by a lack of tolerance of one or more early lifehistory stage to high water temperatures, so targeting spawning to the coolest part of the year could be a tactic allowing maximum penetration into warmer waters. Such a link between the physiology of early life-history stages and timing of spawning could have direct consequences for patterns of distributions over a number of taxonomic scales. If there are similar constraints on the reproduction of other species, even minor increases in water temperature due to global warming that may be within the tolerance of adults, may impose constraints on the timing of spawning, with Xow-on eVects for both species and whole ecosystems.

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Seasonal histological and macroscopic changes in the gonads ofCheimerius nufar(Ehrenberg, 1820) (Sparidae: Pisces)

Cited by 27 publications

References 22 publications

Effects of fishing on a temperate reef community in South Africa 1: ichthyofauna

Effects of fishing on a temperate reef community in South Africa 1: ichthyofauna

Spawning behaviour ofCheimerius nufar in captivity

Is the timing of spawning in sparid fishes a response to sea temperature regimes?

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