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  • 1
    Electronic Resource
    Electronic Resource
    Study of a sand smelt (Atherina boyeri Risso 1810) population reproducing in fresh water (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Ecology of freshwater fish 1 (1992), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A population of sand smelts, Atherina boyeri, lives in the Camargue wetland, southeast France. This study deals with the part of the population that migrates towards the Fumemorte drainage canal, flowing into the brackish lagoon, the Etang du Vaccarès. Between autumn and early spring, some sand smelts migrate from the canal into seasonally flooded freshwater marshes, where they breed, and then leave between March and July, just before the marshes dry out. The sand smelts remaining in the canal use the vegetation-choked smaller branches of the canal for breeding. In summer, most of the sand smelts leave freshwater habitats for the Vaccarès. Male and female sand smelts reach a maximum age of 4 years (5 winters), have the same weight and show a peak in condition in spring. Breeding occurs from March to July. Sand smelts are multiple spawners and batch fecundity increases with the female size. The mean egg diameter is independent of the female length but decreases towards the end of the spawning season. Sand smelts feed mainly on zooplankton and secondarily on benthic invertebrates. Temporary marshes are richer in submerged macrophytes needed for spawning and have lower densities of fish than the canal. In these marshes, sand smelts feed on the large forms of zooplankton that develop because of the low fish abundance. The life-history traits of this population of A. boyeri living in fresh water in Camargue indicate that this environment is not unfavourable for this species. This study showed that this species can undertake local migrations to colonize various habitats. The adaptability of A. boyeri favours its survival in very unstable Mediterranean environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.1992.tb00076.x
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  • 2
    Electronic Resource
    Electronic Resource
    The biology of the common carp, Cyprinus carpio L. in the Camargue, southern France (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 18 (1981), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Carp were sampled monthly during one and a half years in the Etang du Vaccarès, Camargue, southern France using fyke nets. Densities of carp in temporary marshes and canals were determined using rotenone. Carp is the dominant species in biomass in the fresh and brackish waters (14%0) with densities from 11–58 kg/ha in temporary marshes and up to ten times greater in the canals. Scales were used to determine age and growth of 201 carp. The relative condition factor of female and male mature and unsexed fish are not statistically different throughout the year and follow the variations of gonadal development in spring. The best predictive equation of fecundity, Log F= 7.03504 + 0.83829 log ovary weight, was found using a stepwise multiple regression. The sex-ratio in the temporary marshes (♂ : ♀; 1.66–1.76) is greater than the general sex-ratio of the monthly samples (0.67). The diet of carp is characterized by the presence of large numbers of seeds and the absence of large benthic invertebrates. Predation by fish-eating birds and carnivorous fish is minimal, and the annual drying of many marshes is considered the main mortality factor., Accepted 22 July 1980
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1981.tb03769.x
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  • 3
    Electronic Resource
    Electronic Resource
    Life-history variation within a three-spined stickleback population in the Camargue (2002)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 60 (2002), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Among individuals of female three-spined sticklebacks Gasterosteus aculeatus from a population in the Camargue, southern France, studied in 12 successive years, adult LT ranged from 31–64 mm, clutch size ranged from 33–660 eggs, and mean egg diameter per clutch ranged from 1.15–1.67 mm. Because the population was strictly annual, inter-annual variation corresponded to variation among generations having experienced different environmental conditions. Body mass varied significantly among years, suggesting an effect of varying environmental conditions. Gonad mass and clutch size increased with body mass, but mean egg diameter was not correlated to body mass. Body mass-adjusted gonad mass, interpreted as reproductive effort per clutch, did not vary significantly among years, suggesting that this trait was not influenced by environmental conditions. Body mass-adjusted clutch size and egg size varied significantly among years. Inter-annual variation in body length at breeding, clutch size and egg size was of the same order of magnitude as inter-population variation reported by other authors for this species. During the breeding season, reproductive effort and clutch size tended to increase. Egg size tended to decrease during the breeding season but this seasonal pattern varied among years. Observed life-history variation is discussed both in terms of its evolutionary significance and methodological implications in the study of life-history variation among populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2002.tb01721.x
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  • 4
    Electronic Resource
    Electronic Resource
    Impacts of the swimbladder nematode Anguillicola crassus on Anguilla anguilla: variations in liver and spleen masses (2004)
    Oxford, UK; Malden , USA : Blackwell Science Ltd
    Journal of fish biology 64 (2004), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Variations in the liver and spleen masses of the eel Anguilla anguilla were analysed in relation to the parasite load of Anguillicola crassus at autopsy (current infection by swimbladder lumen worms) and in relation to the severity of damage observed in the swimbladder (a way of assessing the intensity of past infections). None of these measures of parasite pressure were shown to account for variation in the relative liver mass, either when controlling for somatic mass or eel age. In marked contrast, a significant increase in spleen size was revealed in eels harbouring many lumen worms and also in eels with severe damage in the swimbladder. Splenic enlargement was nearly two-fold higher among severely affected eels (harbouring more than seven lumen parasites and showing severe damage in the swimbladder) than among infection-free eels (no lumen parasites and no pathological signs in the swimbladder). Several possible hypotheses are reviewed before arguing for an adaptive host response involving the haematological and immunological functions of the spleen. Indeed, among eels with no pathological signs in the swimbladder, the relative spleen mass was positively associated with the mass of lumen parasites, which suggests a hyper-synthesis of blood cells by the spleen in response to the bloodsucking activity of lumen worms. Nevertheless, among eels with no lumen parasites at autopsy, there was still an increase in spleen size in relation to the severity of the swimbladder damage, which also suggests a hyper-synthesis of splenic immune cells (lymphocytes and macrophages) in reaction to damaged tissues and particularly to larvae in the swimbladder wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2004.00309.x
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  • 5
    Electronic Resource
    Electronic Resource
    Morphological variation in hybrids between Salmo marmoratus, and alien Salmo species in the Volarja stream, Soca River basin, Slovenia (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 57 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: There were significant correlations between colour pattern, LDH-5*, genotype and certain meristic characters in 59 hybrid trout Salmo, sp. from the Volarja stream, Soca River basin, Slovenia. It is concluded that panmixia between native Salmo marmoratus, and introduced S. trutta, of Atlantic, Danubian and Mediterranean origin had not been reached in this zone, despite the long period of introgression. The result is in agreement with other studies dealing with introgression in Salmo, and for management purposes certain morphological characters, especially colour pattern, can be a valuable tool in restoring the marble trout population in the Soca River.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb00481.x
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  • 6
    Electronic Resource
    Electronic Resource
    The impact of three-spined sticklebacks on the Zooplankton of a previously fish-free pool (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 26 (1991), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 〈list xml:id="l1" style="custom"〉1In the Camargue (southern France), most invertebrates inhabiting temporary shallow oligohaline marshes and pools are large-bodied, conspicuous and defenceless taxa that are restricted to fish-free environments. Management practices, by creating drainage canals, strongly affect the invertebrate community by allowing colonization by fish.2Sticklebacks colonizing the study pool were sampled daily and Zooplankton sampling was carried out at weekly intervals. From early October until the pool dried in June, 1365 sticklebacks entered and only 139 stickleback's fry and seven adults left the pool. Zooplankton abundance was high during the whole study period with a mean density of 1360 ind. 100cm−2. Larger forms (Daphnia magna, Simocephalus vetulus, Arctodiaptomus wierzejskii) quickly disappeared after the first wave of sticklebacks entered the pool in November. Subsequently, smaller species (Diacyclops bicuspidatus odessanus, Chydorus sphaericus and ostracods) replaced the larger ones until the pool dried.3Food selectivity of sticklebacks and daily Zooplankton consumption were investigated under experimental conditions within the pool in spring. After introduction of sticklebacks, densities of Zooplankton species dropped quickly (D. b. odessanus, C. sphaericus) with the exception of Ostracoda. Estimates of daily Zooplankton consumption by adult sticklebacks varied between 2.8 and 10.7% of fish body weight. Examination of gut contents showed that fry mainly ingested Chydorus sphaericus.4Given that the stickleback is an annual species in the Camargue, and that few fry are able to leave the pool due to the early drying out, the colonization of such a former fish-free pool is not beneficial for the stickleback population. However, a more serious effect of such colonization is the progressive local extinction of the most typical Zooplankton species inhabiting these formerly fish-free environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1991.tb01725.x
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  • 7
    Electronic Resource
    Electronic Resource
    A New Myxosporean Parasite, Kudoa Camarguensis N. Sp., Recorded On Two Goby Species (Teleostei: Pisces) In the Rhône Delta (Mediterranean Sea, France) (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 46 (1999), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: . A new species of myxosporean of the genus Kudoa was found in the muscle tissues of Pamatoschistus minutus (Pallas, 1770), a migratory fish species from the Mediterranean Sea. Previously this Kudoa species had been observed in Pomatoschistus microps (Krøyer, 1838), a sedentary species of the Vaccarés lagoon system. the parasite caused rapid myoliquefaction of the affected muscles within one hour after host death. Using both light and electron microscopy, whitish, longitudinal, spindle-shaped bodies, 2-5 mm long and 1-2 mm wide, were found in the caudal peduncle or in muscle tissues of the abdominal wall. Spore length, width, and thickness (n = 30) ranged between 4.4-6.0 üm, 6.4-8.0 üm, and 4.4-6.0 üm, respectively, while the polar capsules averaged 2.5 times 1.5 üm (n = 30). Anatomic comparison with other myxosporean parasites enabled us to determine this to be a new species that we name Kudoa camarguensis n. sp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1999.tb05129.x
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  • 8
    Electronic Resource
    Electronic Resource
    Biometrical and biological features of Alburnus alburnus×Rutilus rubilio natural hybrids from Lake Mikri Prespa, northern Greece (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 31 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Morphometric and meristic characteristics of a rare hybrid between the Adriatic roach. Rutilus rubilio, and the bleak, Alburnus alburnus, discovered in Lake Mikri Prespa, north-western Greece are described. Axis 1 and 2 of a discriminant analysis using all morphometric and meristic features explains 99.5% of the total variability of the hybrid and both its parents. No back-crossing is detected in the discriminant analysis: all hybrids found are F1 fish. Age and length of the hybrid and its parents were measured; the best-fit growth model is the logistic curve. Growth of the hybrid is faster than that of the Adriatic roach and slightly faster than that of the bleak: this indicates heterosis. Problems in the systematics of genera of European cyprinids are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05275.x
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  • 9
    Electronic Resource
    Electronic Resource
    Annual variations in the reproductive traits of Pomatoschistus microps in a Mediterranean lagoon undergoing environmental changes: evidence of phenotypic plasticity (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 57 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The spawning period of the common goby Pomatoschistus microps from 1993 to 1997 in the Vaccarès lagoon did not vary, except in 1997 when it was longer due to the reproduction of the young-of-the-year. Egg size and number, and reproductive allocation varied greatly with one year to another. Female common gobies increased both their fecundity per spawning act and their egg size from 1993 to 1995. The annual variation in the reproductive effort suggests a high phenotypic plasticity of reproductive traits in P. microps, in the face of environmental perturbations. In winter 1993–1994, a centennial flood of the Rhône River caused major hydrological changes in the lagoon in less than 1 week, affecting many invertebrates and fish for several years. The reproductive investment of the common goby increased, possibly as a consequence of those environmental changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02223.x
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  • 10
    Electronic Resource
    Electronic Resource
    First record of Kudoa (Myxosporea) in Pomatoschistus microps in the Rhône Delta, France (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 53 (1998), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Myxosporidiosis due to Kudoa sp. has been recorded in gobies Pomatoschistus microps, collected from the Etang du Vaccarès (Rhône Delta, France).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1998.tb01843.x
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