The Influence of Water Temperature and Flow on Year Class Strength of Twaite Shad (Alosa Fallax Fallax) From the River Severn, England.

Aprahamian, M. W.; Aprahamian, C. D.

doi:10.1051/kmae:2001030

Cited by 17 publications

(21 citation statements)

References 16 publications

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“…The present study is one of the few studies of the biology of Allis Shad in the British Isles -others include Twomey (1967) and Doherty & McCarthy (2002) -and also provides comparable data on the Twaite Shad, which, in Great Britain, has previously been studied in detail mainly in waters associated with the Severn Estuary (Aprahamian, 1982(Aprahamian, , 1985(Aprahamian, , 1988(Aprahamian, , 1989Aprahamian & Aprahamian 2002). The work inevitably leads on to issues of further research and conservation, which are discussed below.…”

Section: Discussionmentioning

confidence: 80%

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Ecology of Allis Shad Alosa alosa and Twaite Shad Alosa fallax in the Solway Firth, Scotland

Maitland¹,

Lyle²

2005

Hydrobiologia

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The basis of this study were 132 adult Allis Shad and 150 Twaite Shad collected as bycatches from salmon stake nets in Scotland on the north side of the Solway Firth. Most (60%) of the Allis Shad were immature fish 2-3 years of age (mean length 305 mm). Mature males were younger (3-5 years) and smaller (mean length 421 mm) than females (4-6 years and 481 mm mean length). The largest Allis Shad was a female of 515 mm and 2183 g. In contrast, almost all the Twaite Shad were mature, the males younger (3-5 years) and smaller (mean length 341 mm) than the females (4-6 years and 364 mm mean length). The largest Twaite Shad was a female of 400 mm and 1213 g. The food of Allis Shad consisted mainly of small zooplankton with some fish and larger Crustacea. Fine vegetable fragments were common in the stomachs and attributed to filter feeding. The food of Twaite Shad was mainly small fish with some Crustacea. Mature Allis Shad of both sexes with large gonads (maximum female GSI: 20.63) were found throughout the spring and summer but no definite evidence of local spawning was obtained. Mature Twaite Shad of both sexes with large gonads (maximum female GSI: 23.32) were found until early July, thereafter most of the fish were spent. It appears that Twaite Shad spawn locally in June. Some hybrids between the two species were found.

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Section: Discussionmentioning

confidence: 80%

“…for Allis Shad it is generally 15-24°C (Dottrens, 1952;Hoestlandt, 1958;Philippart & Vranken, 1982) and for Twaite Shad, generally 15-22°C (Spillman, 1961;Svetovidov, 1963;Hass, 1968). Water temperatures can also influence year-class strength (Aprahamian & Aprahamian, 2002). The spawning period is normally April-July.…”

Section: Allis Shadmentioning

confidence: 99%

Ecology of Allis Shad Alosa alosa and Twaite Shad Alosa fallax in the Solway Firth, Scotland

Maitland¹,

Lyle²

2005

Hydrobiologia

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“…Year class strength was determined as described by APRAHAMIAN and APRAHAMIAN (2001). Annual survival rate was taken from the relationship between the number of 6 year old female shad caught in year n and the number of 7 year olds caught in year n+1 (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Variation in the Age at First Spawning of Female Twaite Shad (Alosa Fallax Fallax) From the River Severn, England.

Aprahamian

Lester

2001

Bull. Fr. Pêche Piscic.

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The mean age of maturity of female Alosa fallax fallax based on annual samples ranged from 4.28 to 5.26 years, with an overall mean ± 95 % CI of 4.80 ± 0.021 years. The mean age at first spawning was determined for the 1973 -1992 year classes and ranged from 4.41 years to 5.40 years. A significant power relationship existed between the mean age at first spawning and the combined biomass of the 0-2 and 0-3 age groups (P < 0.05), explaining 40.7 % and 31.6 % of the variability in the age at which a year class matures.The relationship between maturity and biomass indicates that the onset of maturity was related to density-dependent processes and fish, that matured early had significantly faster growth rates compared to those that matured later (P < 0.05).The findings suggest that the immature fish at sea congregate in a fairly restricted area where it is likely that the older year classes impact younger ones. The fact that the relationship between maturity and the biomass of various components of the stock breaks down after the age of four may relate to the onset of maturity, as the mature fish enter the rivers to spawn and are effectively isolated from the main population. -942 -d'âge 0-2 et 0-3 (P < 0.05) permet d'expliquer 40.7 % et 31.6 % de la variabilité de la cohorte arrivée à maturité sexuelle.La relation entre l'âge de la maturité sexuelle et la biomasse indique que le commencement de la maturité est fonction de la densité des poissons. Les poissons qui sont arrivés tôt à maturité ont un taux de croissance plus rapide que ceux arrivés à maturité plus tardivement (P < 0.05).Les résultats suggèrent que les poissons immatures de mer se rassemblent dans une aire assez restreinte où il est probable que les cohortes plus âgées impactent sur les plus jeunes. Le fait que la relation entre l'âge de la maturité sexuelle et la biomasse de plusieurs composantes du stock détériore après l'âge de quatre ans est peut-être dû au fait qu'au commencement de la maturité sexuelle, les poissons matures pénètrent en rivière pour pondre et sont donc isolés de la population principale.Mots-clés : âge maturité sexuelle, croissance, Alosa fallax fallax, fleuve Severn.

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“…More specifically, larval survival is affected by temperature (Crecco and Savoy 1985;Savoy and Crecco 1988;Aprahamian and Aprahamian 2001).…”

Section: Introductionmentioning

confidence: 99%

Thermal tolerance of allis shad (Alosa alosa) embryos and larvae: Modeling and potential applications

Jatteau

Drouineau

Charles

et al. 2017

Aquat. Living Resour.

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-The objective of this study was to assess the potential effects of climate change on the survival of allis shad early life history stages. Embryos and larvae were exposed to temperatures ranging from 5 to 35• C. No embryonic survival was recorded at extreme temperatures ( 10 and 30• C), and no larval survival was observed at 5 or 35• C. Based on these experimental results, a survival model was developed to predict survival rates at different temperatures for embryos and larvae up to 14 days post hatch. The model confirmed that embryonic daily survival is more impacted by temperature than larval survival. The highest survival rates (greater than 80%) were found for temperatures between 15.7 and 25.6• C for embryos and between 14.6 and 26.7• C for larvae. This survival model can be used to explore the impact of temperature on recruitment of allis shad in southern France. Preliminary analysis from two different rivers suggests that cold temperatures may have a strong impact on embryonic and larval survival.

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The Influence of Water Temperature and Flow on Year Class Strength of Twaite Shad (Alosa Fallax Fallax) From the River Severn, England.

Cited by 17 publications

References 16 publications

Ecology of Allis Shad Alosa alosa and Twaite Shad Alosa fallax in the Solway Firth, Scotland

Ecology of Allis Shad Alosa alosa and Twaite Shad Alosa fallax in the Solway Firth, Scotland

Variation in the Age at First Spawning of Female Twaite Shad (Alosa Fallax Fallax) From the River Severn, England.

Thermal tolerance of allis shad (Alosa alosa) embryos and larvae: Modeling and potential applications

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