scholarly journals Influence of environmental variability and age on the body condition of small pelagic fish in the Gulf of Lions

2015 ◽  
Vol 529 ◽  
pp. 219-231 ◽  
Author(s):  
P Brosset ◽  
F Ménard ◽  
JM Fromentin ◽  
S Bonhommeau ◽  
C Ulses ◽  
...  
Keyword(s):  
Body Condition ◽  
Environmental Variability ◽  
Pelagic Fish ◽  
The Body ◽  
Small Pelagic Fish ◽  
Gulf Of Lions

scholarly journals Body reserves mediate trade-offs between life-history traits: new insights from small pelagic fish reproduction

2016 ◽  
Vol 3 (10) ◽  
pp. 160202 ◽  
Author(s):  
Pablo Brosset ◽  
Josep Lloret ◽  
Marta Muñoz ◽  
Christian Fauvel ◽  
Elisabeth Van Beveren ◽  
...  
Keyword(s):  
Life History ◽  
Maternal Effects ◽  
Body Condition ◽  
Life History Traits ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Gulf Of Lions ◽  
Fish Size ◽  
Trade Offs ◽  
The Cost

Limited resources in the environment prevent individuals from simultaneously maximizing all life-history traits, resulting in trade-offs. In particular, the cost of reproduction is well known to negatively affect energy investment in growth and maintenance. Here, we investigated these trade-offs during contrasting periods of high versus low fish size and body condition (before/after 2008) in the Gulf of Lions. Female reproductive allocation and performance in anchovy ( Engraulis encrasicolus ) and sardine ( Sardina pilchardus ) were examined based on morphometric historical data from the 1970s and from 2003 to 2015. Additionally, potential maternal effects on egg quantity and quality were examined in 2014/2015. After 2008, the gonadosomatic index increased for sardine and remained steady for anchovy, while a strong decline in mean length at first maturity indicated earlier maturation for both species. Regarding maternal effects, for both species egg quantity was positively linked to fish size but not to fish lipid reserves, while the egg quality was positively related to lipid reserves. Atresia prevalence and intensity were rather low regardless of fish condition and size. Finally, estimations of total annual numbers of eggs spawned indicated a sharp decrease for sardine since 2008 but a slight increase for anchovy during the last 5 years. This study revealed a biased allocation towards reproduction in small pelagic fish when confronted with a really low body condition. This highlights that fish can maintain high reproductive investment potentially at the cost of other traits which might explain the present disappearance of old and large individuals in the Gulf of Lions.

scholarly journals Concomitant changes in the environment and small pelagic fish community of the Gulf of Lions

2020 ◽  
Vol 186 ◽  
pp. 102375 ◽  
Author(s):  
Guillaume Feuilloley ◽  
Jean-Marc Fromentin ◽  
Lars Stemmann ◽  
Hervé Demarcq ◽  
Claude Estournel ◽  
...  
Keyword(s):  
Fish Community ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Gulf Of Lions ◽  
Pelagic Fish Community

scholarly journals Influence of environmental variability on the body condition of the mangrove horseshoe crab Carcinoscorpius rotundicauda from Banyuasin Estuarine, South Sumatra, Indonesia

2020 ◽  
Vol 30 ◽  
pp. 37-46
Author(s):  
Nita P. Sari ◽  
Noviantrio Gulo ◽  
Miftahun Najah ◽  
Fauziyah .
Keyword(s):  
Body Condition ◽  
Horseshoe Crab ◽  
Environmental Variability ◽  
Sampling Site ◽  
Environmental Parameters ◽  
Well Being ◽  
Management Plan ◽  
Marine Conservation ◽  
The Body ◽  
Condition Indices

The body conditions indices were useful to determine an individual's well-being, and favorable food availability indicating a good environmental condition. The conditions of the mangrove horseshoe crab (Carcinoscorpius rotundicauda) might be related to several environmental parameters. The study's aim was to analyze the key environmental parameters affecting the body condition of C. rotundicauda found in Banyuasin Estuary Waters. The sampling was conducted in July 2019 in Banyuasin Estuary Waters.  The data of weight and prosomal width for C. rotundicauda were used to estimate the body conditions indices (relative condition factor). While the environmental parameters data were recorded for each sampling site. The backward stepwise regression was used to determine the key environmental parameters affecting the body condition indices. The best-fitted model (adjusted R2 = 91.9%; F = 60.102; p < 0.05) indicated several environmental parameters (salinity, pH, seafloor temperature, clay and silt contents) significantly affecting the body condition indices. Changes in the key environmental parameters could generate changes in the availability of favorable food for C. rotundicauda. The result also can be used as baseline data for determining the marine conservation areas as well as horseshoe crab management plan.

scholarly journals Small pelagic fish dynamics: A review of mechanisms in the Gulf of Lions

2019 ◽  
Vol 159 ◽  
pp. 52-61 ◽  
Author(s):  
Claire Saraux ◽  
Elisabeth Van Beveren ◽  
Pablo Brosset ◽  
Quentin Queiros ◽  
Jean-Hervé Bourdeix ◽  
...  
Keyword(s):  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Gulf Of Lions

Oceanographic habitat suitability is positively correlated with the body condition of a coastal‐pelagic fish

2019 ◽  
Vol 29 (1) ◽  
pp. 100-110 ◽  
Author(s):  
Curtis Champion ◽  
Alistair J. Hobday ◽  
Gretta T. Pecl ◽  
Sean R. Tracey
Keyword(s):  
Body Condition ◽  
Habitat Suitability ◽  
Pelagic Fish ◽  
The Body

scholarly journals Changes in Life History Traits of Small Pelagic Fish in the Western Mediterranean Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Marta Albo-Puigserver ◽  
Maria Grazia Pennino ◽  
Jose María Bellido ◽  
Ana Isabel Colmenero ◽  
Ana Giráldez ◽  
...  
Keyword(s):  
Life History ◽  
Mediterranean Sea ◽  
Body Condition ◽  
Life History Traits ◽  
Seawater Temperature ◽  
Western Mediterranean ◽  
Pelagic Fish ◽  
Additive Models ◽  
Small Pelagic Fish ◽  
Western Mediterranean Sea

Small pelagic fish (SPF) in the western Mediterranean Sea are key elements of the marine food web and are important in terms of biomass and fisheries catches. Significant declines in biomass, landings, and changes in the age/size structure of sardine Sardina pilchardus and anchovy Engraulis encrasicolus have been observed in recent decades, particularly in the northern area of the western Mediterranean Sea. To understand the different patterns observed in SPF populations, we analyzed key life history traits [total length at age, length at maturity, gonadosomatic index (GSI), and body condition (Kn)] of sardine and anchovy collected between 2003 and 2017, from different fishing harbors distributed along a latitudinal gradient from northern to southern Spain. We used Generalized Linear Models (GLM) to estimate the length at maturity and Generalized Additive Models (GAMs) to test the relationship with environmental variables (seawater temperature, water currents, and net primary productivity). The life history traits of both species presented seasonal, interannual and latitudinal differences with a clear decline in length at age, length at first maturity, and body condition, for both species in the northern part of the study area. In the southern part, on the contrary, life history traits did not present a clear temporal trend. The environmental conditions partially explained the long-term changes in life history traits, but the selected variables differed between areas, highlighting the importance of regional oceanographic conditions to understand the dynamics of small pelagic fish. The truncated length-at-age pattern for both species with the disappearance of the larger individuals of the population could have contributed to the poor condition of small pelagic fish populations in the northern part of the western Mediterranean Sea in recent years. In the south area, recent declines in body condition for sardine and anchovy were observed and could be a possible first sign for future population declines. This study highlights the importance of understanding the trade-off between the energy invested in reproduction, maintenance and growth at seasonal and interannual level to advance our knowledge on how environmental and human pressures influence population dynamics of small pelagic fish at local and regional scales.

scholarly journals Zooplankton mortality effects on the plankton community of the northern Humboldt Current System: sensitivity of a regional biogeochemical model

2021 ◽  
Vol 18 (9) ◽  
pp. 2891-2916
Author(s):  
Mariana Hill Cruz ◽  
Iris Kriest ◽  
Yonss Saranga José ◽  
Rainer Kiko ◽  
Helena Hauss ◽  
...  
Keyword(s):  
Environmental Variability ◽  
Current System ◽  
Fish Predation ◽  
Grazing Pressure ◽  
Pelagic Fish ◽  
Trophic Levels ◽  
Fish Populations ◽  
Biogeochemical Model ◽  
Small Pelagic Fish ◽  
Humboldt Current

Abstract. Small pelagic fish off the coast of Peru in the eastern tropical South Pacific (ETSP) support around 10 % of global fish catches. Their stocks fluctuate interannually due to environmental variability which can be exacerbated by fishing pressure. Because these fish are planktivorous, any change in fish abundance may directly affect the plankton and the biogeochemical system. To investigate the potential effects of variability in small pelagic fish populations on lower trophic levels, we used a coupled physical–biogeochemical model to build scenarios for the ETSP and compare these against an already-published reference simulation. The scenarios mimic changes in fish predation by either increasing or decreasing mortality of the model's large and small zooplankton compartments. The results revealed that large zooplankton was the main driver of the response of the community. Its concentration increased under low mortality conditions, and its prey, small zooplankton and large phytoplankton, decreased. The response was opposite, but weaker, in the high mortality scenarios. This asymmetric behaviour can be explained by the different ecological roles of large, omnivorous zooplankton and small zooplankton, which in the model is strictly herbivorous. The response of small zooplankton depended on the antagonistic effects of mortality changes as well as on the grazing pressure by large zooplankton. The results of this study provide a first insight into how the plankton ecosystem might respond if variations in fish populations were modelled explicitly.

scholarly journals Microplastics FTIR characterisation and distribution in the water column and digestive tracts of small pelagic fish in the Gulf of Lions

2019 ◽  
Vol 142 ◽  
pp. 510-519 ◽  
Author(s):  
Charlotte Lefebvre ◽  
Claire Saraux ◽  
Olivier Heitz ◽  
Antoine Nowaczyk ◽  
Delphine Bonnet
Keyword(s):  
Water Column ◽  
Pelagic Fish ◽  
Small Pelagic Fish ◽  
Gulf Of Lions

scholarly journals Zooplankton mortality effects on the plankton community of the Northern Humboldt Current System: Sensitivity of a regional biogeochemical model

2020 ◽  
Author(s):  
Mariana Hill Cruz ◽  
Iris Kriest ◽  
Yonss Saranga José ◽  
Rainer Kiko ◽  
Helena Hauss ◽  
...  
Keyword(s):  
Environmental Variability ◽  
Current System ◽  
Fish Predation ◽  
Grazing Pressure ◽  
Pelagic Fish ◽  
Trophic Levels ◽  
Fish Populations ◽  
Biogeochemical Model ◽  
Small Pelagic Fish ◽  
Humboldt Current

Abstract. Small pelagic fish off the coast of Peru in the Eastern Tropical South Pacific (ETSP) support around 10 % of the global fish catches. Their stocks fluctuate interannually due to environmental variability which can be exacerbated by fishing pressure. Because these fish are planktivorous, any change in fish abundance may directly affect the plankton and the biogeochemical system. To investigate the potential effects of variability in small pelagic fish populations on lower trophic levels, we used a coupled physical-biogeochemical model to build scenarios for the ETSP and compare these against an already published reference simulation. The scenarios mimic changes in fish predation by either increasing or decreasing mortality of the model's large and small zooplankton compartments. The results revealed that large zooplankton was the main driver of the response of the community. Its concentration increased under low mortality conditions and its prey, small zooplankton and large phytoplankton, decreased. The response was opposite, but weaker, in the high mortality scenarios. This asymmetric behaviour can be explained by the different ecological roles of large, omnivorous zooplankton, and small zooplankton, which in the model is strictly herbivorous. The response of small zooplankton depended on the antagonistic effects of mortality changes as well as the grazing pressure by large zooplankton. The results of this study provide a first insight on how the plankton ecosystem might respond if variations in fish populations were modelled explicitly.

scholarly journals Allometric relations and consequences for feeding in small pelagic fish in the Bay of Biscay

2012 ◽  
Vol 70 (1) ◽  
pp. 232-243 ◽  
Author(s):  
Eneko Bachiller ◽  
Xabier Irigoien
Keyword(s):  
Body Size ◽  
Prey Size ◽  
Pelagic Fish ◽  
The Body ◽  
Large Prey ◽  
Bay Of Biscay ◽  
Small Pelagic Fish ◽  
Predator Prey ◽  
Allometric Relations ◽  
Gape Size

Abstract Bachiller, E. and Irigoien, X. 2013. Allometric relations and consequences for feeding in small pelagic fish in the Bay of Biscay. – ICES Journal of Marine Science, 70:232–243. The body size of fish is an important factor in determining their biology and ecology, as predators eat prey smaller than themselves. Predator mouth size restricts the availability of possible prey. In this paper we provide the allometric relationships of eight common, small pelagic fish species in the Bay of Biscay. In addition, we describe the predator-prey size ratios for different species, and we determine changes in their ratio-based trophic-niche breadth with increasing body size. Results suggest that gape size does not totally determine the predator-prey size ratio distribution, but predators use the entire available prey size range, including the smallest. As they grow they simply incorporate larger prey as their increased gape size permits. Accordingly, a large degree of overlap was found in the diet composition in terms of size and predator-prey ratios, even between fish of different sizes. Of the species studied, only horse mackerels seem to be clearly specialized in relatively large prey.

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