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

Jatteau, Philippe; Drouineau, Hilaire; Charles, Katia; Carry, L. Ray; Lange, Frédéric; Lambert, Patrick

doi:10.1051/alr/2016033

Cited by 14 publications

(13 citation statements)

References 46 publications

(52 reference statements)

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“…Such low survival probabilities were not expected for the normoxic treatment, since Jatteau et al . (2017) identified survival rates greater than 80% for allis shad from hatching to 14 days old between 16.6 and 24.8°C, but this result was obtained with limited manipulation of the fish. In our study the transport of the larvae may have impacted their early survival.…”

Section: Discussionmentioning

confidence: 98%

“…Because of their low catchability and high sensitivity to stress, allis shad young‐of‐the‐year biology and recruitment are poorly documented compared to other migratory fish (Baglinière et al ., 2003; Lochet et al ., 2008; Taverny et al ., 2000). However, allis shad larvae and juveniles may be subjected to many pressures during the freshwater phase, such as unsuitable temperatures (Jatteau et al ., 2017), but also floods, predation, fasting or pollutants, just like other young‐of‐the‐year fishes ( e.g ., Jensen & Johnsen, 1999; Johnson et al ., 2007; Roby et al ., 2003). When migrating seaward, juveniles are exposed to salinity changes (Bardonnet & Jatteau, 2008; Leguen et al ., 2007), and they may suffer high temperatures and low levels of oxygen, especially when passing through highly turbid estuaries ( e.g ., Lanoux et al ., 2013; Marchand, 1993; Sauriau et al ., 1994).…”

Section: Introductionmentioning

confidence: 99%

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Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Baumann

Vega

Philip

et al. 2020

Journal of Fish Biology

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The ecology of the young stages of allis shad Alosa alosa is poorly documented, although they can be exposed to many pressures during their freshwater phase and their downstream migration. When passing through systems such as the Gironde‐Garonne‐Dordogne watershed (GGD, SW France), they can be subjected to high temperatures and low levels of oxygen (hypoxia). The aim of this work is to assess the tolerance of young Alosa alosa at four ages (c. 10, 30, 60 and 85 days old) by challenging them to different temperatures (18, 22, 26 and 28°C) together with decreasing oxygen saturation levels (from 100% to 30%). Survival of the 10‐day‐old individuals was not influenced by oxy‐thermic conditions, but high stress levels were detected and perhaps this age class was too fragile regarding the constraint of the experimental design. Survival at 30 and at 60 days old was negatively influenced by the highest temperatures tested alone (from 26°C and from 28°C, respectively) but no effect was detected at 85 days old up to 28°C. A combined effect of temperature and oxygen level was highlighted, with heat accelerating survival decrease when associated with oxygen level depletion: essentially, survival was critical (<50%) at 30 days old at temperature ≥22°C together with 30% O2; at 60 days old, at temperature = 28°C with 30% O2; at 85 days old, at temperature ≥26°C with ≤40% O2. Tolerance to oxy‐thermic pressures appeared to be greater among the migratory ages (60 and 85 days old) than among the 30‐day‐old group. Based on environmental data recorded in the GGD system and on our experimental results, an exploratory analysis allowed a discussion of the possible impact of past oxy‐thermic conditions on the local population dynamics between 2005 and 2018. The oxy‐thermic conditions that may affect Alosa alosa at ages when they migrate downstream (60 and 85 days old) were not frequently recorded in this period, except in cases of extreme episodes of heat together with hypoxia that occurred in some years, in summertime in the turbidity maximum zone of the Gironde estuary (particularly in the year 2006). Interestingly, oxy‐thermic conditions that are likely to threaten the 30‐day‐old individuals occurred more frequently in the lower freshwater parts of the GGD system between the years 2005 and 2018. In the context of climate change, a general increase in temperature is predicted, as well as more frequent and severe hypoxic events, therefore we suggest that local Alosa alosa population recruitment could encounter critical oxy‐thermic conditions more frequently in the future if no adaptive management of water resources occurs.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Baumann

Vega

Philip

et al. 2020

Journal of Fish Biology

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“…In the current study, mean energy content of single hydrated oocytes of females sampled at Foundiougne were found to be significantly higher during the cold and dry season (March-May) than at the end of the wet season (October). This may be a valuable adaptation to longer ontogenetic times due to lower water temperatures at the beginning of the year and to elevated metabolic demands due to overall high salinities in the estuary's middle reaches during the dry season (Alderdice & Forrester, 1968;Alderdice & Velsen, 1971;Jatteau et al, 2017).…”

Section: Identification Of Stock Spawning Componentsmentioning

confidence: 99%

Spawning energetics and otolith microchemistry provide insights into the stock structure of bonga shad Ethmalosa fimbriata

Döring

Wagner

Tiedemann

et al. 2019

Journal of Fish Biology

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The gross energy content of spawning batches and the microchemistry of sagittal otoliths in individual female bonga shad Ethmalosa fimbriata were compared between contrasting sampling sites at the Senegalese southern coast and inside the hypersaline Sine Saloum Estuary. Results show that females spawning in the estuary's middle reaches invested almost three times more energy into reproduction (115 ± 65 J g−1 body mass) than their neritic counterparts (39 ± 34 J g−1 body mass). Also, female otolith levels of Ba:Ca, Sr:Ca and Zn:Ca either differed significantly between study sites or could be linked to heterogeneous environmental variables. A quadratic discriminant function analysis provided evidence of segregated spawning populations of E. fimbriata in southern Senegalese waters.

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“…Incubation times, however, may vary significantly with water temperature (Jatteau et al 2017) and salinity (Holliday 1969). Hatching success and survival probabilities of marine fish eggs and early life stages are generally prone to impairment under high temperature and elevated salinity conditions (Hempel 1979, Martin 1988.…”

Section: Introductionmentioning

confidence: 99%

Using oocyte essential fatty acid composition to assess spawner reproductive potential under hypersaline conditions

Döring¹,

Ekau²

2017

Mar. Ecol. Prog. Ser.

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Inversion of estuaries in the dry tropics (i.e. salinity increases upstream) against the backdrop of a globally changing climate is forcing migratory clupeid fish species to adapt quickly to modifications in their spawning habitats to ensure reproductive success. Hatching success and survival probabilities of marine fish eggs and early life stages are prone to impairment under high temperature and elevated salinity conditions. Essential fatty acids affect osmoregulation in marine fish early life stages, and deficiencies can therefore be expected to cause elevated offspring mortality under hyperosmotic conditions, ultimately modifying a stock's reproductive potential. Here we show that oocytes spawned by bonga shad Ethmalosa fimbriata inside a hypersaline estuary exhibited significantly higher 20:4 (n-6) proportions (1.6 ± 0.7% of total fatty acids) than oocytes spawned under marine conditions (0.6 ± 0.2%). Further, oocyte proportions in 20:4 (n-6), 20:5 (n-3), and 20:6 (n-3) were positively correlated with water temperature, water salinity, and female reproductive investment (relative batch fecundity, gonado-somatic index, oocyte dry weight). Oocytes spawned during high temperature/high salinity conditions inside the estuary are therefore likely to develop normally under the prevailing conditions. Reproductive potential was determined to be highest in females spawning inside the estuary at the end of the wet season, when temperatures are high and salinities are less stressful due to freshwater input. Results lead to the conclusion that migratory clupeid fishes can maintain their reproductive potential in hypersaline estuaries and lagoons, which potentially allows for sustainable stock sizes.

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

Cited by 14 publications

References 46 publications

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Tolerance of young allis shad Alosa alosa (Clupeidae) to oxy‐thermic stress

Spawning energetics and otolith microchemistry provide insights into the stock structure of bonga shad Ethmalosa fimbriata

Using oocyte essential fatty acid composition to assess spawner reproductive potential under hypersaline conditions

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