The influence of growth rate on the size of migrating female eels in Lake Ellesmere, New Zealand

Jellyman, D. J.

doi:10.1111/j.1095-8649.2001.tb00525.x

Cited by 40 publications

(35 citation statements)

References 30 publications

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“…As with most species, female eels would tend to maximise their size at migration for increased fecundity (Wenner & Musick 1974, Vøllestad & Jonsson 1986, Helfman et al 1987. However, this strategy would be modulated by the environment (Vøllestad 1992), and size at migration would be smaller in a slow growth environment (Oliveira 1999, Jellyman 2001, Jessop et al 2004). According to Svedäng et al (1996) eels would leave at the earliest possible opportunity and this would be determined by energy reserves (Larsson et al 1990).…”

Section: Influence Of Body Length and Agementioning

confidence: 99%

Impact of silvering stage, age, body size and condition on reproductive potential of the European eel

Durif¹,

Dufour²,

Élie³

2006

Mar. Ecol. Prog. Ser.

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Deteriorating reproductive capacities are a possible cause for the decline in eel populations. However, since no sexually maturing adults have ever been found in the open ocean, there is no possible observation of this life-phase in the natural environment. To test whether eels display variations in their reproductive capacity, we investigated the response of the European eel Anguilla anguilla to artificially induced sexual maturation. The objective was to describe the variability in the maturation response of eels in terms of gonad weight and vitellogenin levels and to try and relate this variability to individual characteristics (length, condition, age and silvering stage). We carried out 3 sets of experiments in which sexual maturation was induced in female silver European eels from different locations using weekly carp pituitary extract (CPE) injections. External parameters of eels were measured every week, and several individuals were sacrificed at monthly intervals for blood and organ sampling. Although gonad weight in most treated eels increased by as much as 50% of total body weight, results showed that individual responses were highly variable. Part of this variability could be explained by individual characteristics of eels. Individuals which initially were the most advanced in the silvering process and had a high condition factor showed the best maturation response. Age of eels was correlated with energy stores, and it was shown that eels benefit from delaying their migration and reproduction. Furthermore, highest gonad development was obtained for eels measuring over 700 mm body length. KEY WORDS: European eel · Anguilla anguilla · Females · Biometry · Sexual maturation · Life historyResale or republication not permitted without written consent of the publisher

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Section: Influence Of Body Length and Agementioning

confidence: 99%

Impact of silvering stage, age, body size and condition on reproductive potential of the European eel

Durif¹,

Dufour²,

Élie³

2006

Mar. Ecol. Prog. Ser.

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“…Males also approach their theoretical maximum length more quickly than females (Jessop et al 2004), reflecting a negative relationship between growth rate and age at maturity consistent with life history theory (Stearns and Crandall 1984) and generally observed in eels (Vollestad 1992;Jellyman 2001;Oliveira and McCleave 2002).…”

Section: General Patternsmentioning

confidence: 50%

A synthesis of the ecological processes influencing variation in life history and movement patterns of American eel: towards a global assessment

Vélez‐Espino

Koops

2009

Rev Fish Biol Fisheries

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American eel, Anguilla rostrata, is a catadromous fish that spawns in the Sargasso Sea and migrates to coastal waters and freshwater systems ranging from Greenland down the Atlantic coast to South America and has been regarded as comprising a panmictic population. American eel is in decline across much of its range. Research and management is primarily conducted at local to regional scales, yielding inconsistent research results and management recommendations that may be inhibited by large-scale processes. We review the research on American eel ecology demonstrating that its variable life history and movement patterns can be explained based on: (1) latitudinal productivity gradients; (2) ideal free habitat selection; (3) conditional evolutionarily stable life history strategies; (4) size at arrival to the coast (correlated with distance from the spawning grounds); and, (5) temperature variance and annual degree-day effects on somatic growth. Using these ecological processes, we outline how local and largescale effects on American eel dynamics can be integrated in a panmictic (or quasi-panmictic) modelling framework to enable defensible predictions of population responses to anthropogenic and oceanic phenomena. Due to its widespread distribution and existing knowledge gaps, the conservation and management of American eel will require international cooperation.

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“…The different bile composition between males and females could be related to their different diets. In the case of the eel [a fish with a clearly different growth strategy between the sexes as females can be 20 times bigger than the males (Davey and Jellyman, 2005)] males have a preference for invertebrates and small fish whereas females prefer bigger fish (Jellyman, 2001). However, during their migration from the rivers and lakes of Europe and North Africa to their spawning grounds in the Sargasso Sea, eels do not feed (Tesch, 2003;van Ginneken et al, 2005).…”

Section: Putative Biological Roles Of Olfactory Sensitivity To Bile Amentioning

confidence: 99%

Olfactory sensitivity to bile fluid and bile salts in the European eel (Anguilla anguilla), goldfish (Carassius auratus) and Mozambique tilapia (Oreochromis mossambicus) suggests a `broad range' sensitivity not confined to those produced by conspecifics alone

Huertas

Hagey

Hofmann

et al. 2010

Journal of Experimental Biology

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SUMMARYTeleosts have high olfactory sensitivity to bile salts. To assess whether this phenomenon is involved in intra-specific chemical communication alone, or is part of a more 'broad range' sensitivity to bile salts produced by heterospecifics, we investigated possible differences in the odour of bile between the sexes and among different species -the eel (Anguilla anguilla), goldfish (Carassius auratus) and Mozambique tilapia (Oreochromis mossambicus) -using the electro-olfactogram (EOG). We also identified the main bile constituents by liquid chromatography and mass spectrometry. There were marked differences in olfactory response of the eel to thin-layer chromatography fractions of bile from both sexes, and mature and immature conspecifics. Smaller differences were seen in the potency of fractions of bile from male and female goldfish and tilapia. Eels, goldfish and tilapia demonstrated similar olfactory sensitivity to bile from a range of different species, with no apparent correlation between the olfactory potency of bile and a phylogenetic closeness and/or similarity of diet of the donor to the receiver. The three species were able to detect odorants in thin-layer chromatography fractions of heterospecific bile even in the absence of activity in conspecific bile. Eels, goldfish and tilapia responded to both sulphated C 27 bile salts (5-scymnol-sulphate and 5-cyprinol sulphate) and to taurine-conjugated C 24 bile salts (taurochenodeoxycholic acid, taurolithocholic acid and taurocholic acid), irrespective of whether these bile salts were present in conspecific bile. Together, these results suggest that teleosts have a broad-range olfactory sensitivity to bile salts, with potential roles in both intra-specific chemical communication and in inter-specific interactions.

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The influence of growth rate on the size of migrating female eels in Lake Ellesmere, New Zealand

Cited by 40 publications

References 30 publications

Impact of silvering stage, age, body size and condition on reproductive potential of the European eel

Impact of silvering stage, age, body size and condition on reproductive potential of the European eel

A synthesis of the ecological processes influencing variation in life history and movement patterns of American eel: towards a global assessment

Olfactory sensitivity to bile fluid and bile salts in the European eel (Anguilla anguilla), goldfish (Carassius auratus) and Mozambique tilapia (Oreochromis mossambicus) suggests a `broad range' sensitivity not confined to those produced by conspecifics alone

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