Diets of Micropterus Salmoides Lac. And Esox Lucius L. In Lake Trasimeno (Umbria, Italy) and Their Diet Overlap.

Lorenzoni, Massimo; Corboli, M.; Giovinazzo, Giancarlo; Selvi, S.; Mearelli, Mario

doi:10.1051/kmae:2002050

Cited by 39 publications

(54 citation statements)

References 27 publications

(30 reference statements)

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“…Nevertheless, just as in this study, others [32]; [33] have shown that pike are flexible with respect to their choice of food -large invertebrate rations and a large diversity of fish species has been noted in pike population. In other studies, however, it has been found that there is a relatively small spectrum of food, and a substantial significance of invertivores in the food [34], [35]. During the study, a relatively large amount of empty stomachs, average 35 %, was noted both in channelized and natural rivers.…”

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confidence: 62%

“…During the study, a relatively large amount of empty stomachs, average 35 %, was noted both in channelized and natural rivers. The proportion of empty stomachs in recent studies vary between 28 % and 78 % on average, annually (28 % [36]; 50 % [34]; 50 % [32]; 33 % [35]; 54 % [33]; 78 % [37]; 58 % [18]). …”

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confidence: 99%

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Pike Esox Lucius Distribution and Feeding Comparisons in Natural and Historically Channelized River Sections

Ivanovs

2016

Environmental and Climate Technologies

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-During the last century a large portion of small and medium-sized rivers in Latvia were channelized, hydroelectric power stations were also built, which led to changes in the hydrodynamic conditions, geomorphological structure, as well as a change in the fish fauna. Fish are an integral part of any community in natural or man-made bodies of water. They actively participate in maintaining the system, balancing/equilibrium, energy, substance transformation and biomass production. They are able to influence other organisms in the ecosystem in which they live. The aim of the paper "Pike distribution and feeding comparisons in natural and historically channelized river sections" is to find out what pike feed on in different environments in Latvian rivers, such as natural and straightened river sections, as well as what main factors determine the composition of their food. Several points were assessed during the course of the study: the impact of environmental conditions on the feeding habits and the distribution of pike; the general feeding habits of predators in Latvian rivers; the feeding differences of predators in natural and straightened river sections; and lastly, rhithral and pothamal habitats were compared. The study was based on data from 2014 and 2015 on fish fauna monitoring. During the study, 347 pike were collected from 136 plots using electrofishing method.

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confidence: 62%

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confidence: 99%

Pike Esox Lucius Distribution and Feeding Comparisons in Natural and Historically Channelized River Sections

Ivanovs

2016

Environmental and Climate Technologies

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“…Once introduced, an exotic species can create serious problems for the native fish species (HOLCIK, 1991), even more so if the alien species is a successful piscivorous, such as largemouth bass. In fact, several studies have reported that non-native species can seriously affect populations of autochthonous species (WILLIAMSON and FITTER, 1996;HOLCIK, 1991;COX, 1999;LORENZONI et al, 2002a;JERSCKE and STRAYER, 2005).…”

Section: Discussionmentioning

confidence: 99%

“…In fact, after an early diet of zooplankton and insects (KEAST and WEBB, 1966;HEIDINGER, 1976;KEAST, 1985;PHILLIPS et al, 1995) M. salmoides begins eating fish usually at 50-70 mm standard length (PHILLIPS et al, 1995;OLSON, 1996), quickly (at 80-100 mm of SL) becoming exclusively piscivorous in the presence of available prey (CARLANDER, 1977;WERNER et al, 1977;KEAST, 1985). Other studies carried out in Central Italy have shown low growth rates (ZERUNIAN, 1980;ALESSIO, 1981 andLORENZONI et al, 2002a) and a reproductive period occurring between May and July (January-April in Umbria, Central Italy -LORENZONI et al, 2002b), when the females spawn several eggs many times due to their asynchronous ovary (BREDER and ROSEN, 1966;TORTONESE, 1975;ALESSIO, 1983). …”

Section: Introductionmentioning

confidence: 99%

Diet and Reproduction of Largemouth Bass in a Recently Introduced Population, Lake Bracciano (Central Italy)

Marinelli¹,

Scalici²,

Gibertini³

2007

Bull. Fr. Pêche Piscic.

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This paper concerns a study of some aspects of largemouth bass ecology in an Italian lake (Lake Bracciano). We assessed the success and possible impact of its recent introduction (1998) upon the fish community. From October 2001 to September 2002, 162 individuals were caught, measured, aged and submitted to biopsy (stomach and gonads were removed). Four age classes, from 0 + to 3 +, were observed in the population. Largemouth bass feeding activity was high in June, mostly eating fish (55.7%), crustaceans (in particular Palaemonetes antennarius, 37.5%), insects (4.5%) and molluscs (2.3%). The G.S.I. values showed an autumnal breeding period (from December to February) rather than the spring-summer one frequently described in North America. Moreover, bass attained sexual maturity during the second year of life (1 +). These differences could be related to its recent introduction and the apparent success could represent a problem for other species in the Lake.

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“…Otherwise, it could be the predation acting more strongly on small specimens (Ricker 1975); however, fish assemblage, with regard to predators, is not substantially changed in recent years. The latest introduction is the Largemouth Bass, Micropterus salmoides (Lacepedè, 1802), but it does not seem to prefer the tench among its preys (Lorenzoni et al, 2002b) and does not appear to have abundances such to affect the population dynamics of tench in the Trasimeno lake. Thus, is not to be excluded that the predatory pressure on the smaller specimens is performed by cormorants Phalacocrorax carbo.…”

Section: Figurementioning

confidence: 99%

Growth and reproductive properties of Tench,Tinca tincaLinnaeus, 1758 in Trasimeno Lake (Umbria, Italy)

Pompei

Franchi

Giannetto

et al. 2012

Knowl. Managt. Aquatic Ecosyst.

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Key-words:von Bertalanffy's parameters, back calculation, reproduction, fecundity, gonadosomatic index Growth and some reproductive properties of native Tinca tinca Linnaeus, 1758 from Trasimeno Lake were investigated during 2009 and 2010. The total sample of fish (510) was composed by 126 males, 221 females and 163 immature specimens. Total length (TL ± 0.1 cm) and weight (W ± 0.1 g) were recorded; age estimation was based on scalimetry and sex was determined by microscopic observation of the gonads. Age composition varied from 1+ to 11+. The TL-W relationship was log 10 W = −2.235 + 3.248 log 10 TL. Previous growth was determined with back-calculation from scale measurements using the Fraser-Lee method. Theoretical length growth was estimated with von Bertalanffy's model. Analysis of the gonadosomatic index (GSI) suggests that the reproductive period of the population took place from May to July. Sexual maturation occurred in both sexes at the second year of life. The mean diameter of eggs was 0.075 mm. The mean number of eggs produced by each female was 233 930 and increased with the size of the specimens. Though it is one of the most widespread and interested species in fishing in Italian waters, tench has not been widely studied; this research deepens some biological characteristics of this species that is strongly shrinking in Italy. La longueur totale (TL ± 0,1 cm) et le poids (W ± 0,1 g) ont été enregistrés ; l'estimation de l'âge a été faite par scalimétrie et le sexe a été déterminé par l'observation microscopique des gonades. La composition en âge variait de 1+ à 11+. La relation TL-W était log 10 W = −2, 235 + 3,248 log 10 TL. La croissance a été détermi-née par rétro-calcul à partir de mesures sur les écailles en utilisant la méthode de Article published by EDP Sciences L. Pompei et al.: Knowl. Managt. Aquatic Ecosyst. (2012) 406, 07 Fraser-Lee. La croissance en longueur théorique a été estimée avec le modèle de von Bertalanffy. L'analyse de l'indice gonadosomatique (GSI) suggère que la période de reproduction de la population a lieu de mai à juillet. La maturation sexuelle a eu lieu dans les deux sexes dès la deuxième année de vie. Le diamètre moyen des oeufs était de 0,075 mm. Le nombre moyen d'oeufs produits par chaque femelle était 233 930 et augmentait avec la taille des spécimens. Bien qu'elle soit l'une des espèces les plus répandues et recherchées par la pêche dans les eaux italiennes, la tanche n'a pas été largement étudiée ; cette recherche approfondit certaines caractéristiques biologiques de cette espèce qui est en forte régression en Italie. RÉSUMÉ

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Diets of Micropterus Salmoides Lac. And Esox Lucius L. In Lake Trasimeno (Umbria, Italy) and Their Diet Overlap.

Cited by 39 publications

References 27 publications

Pike Esox Lucius Distribution and Feeding Comparisons in Natural and Historically Channelized River Sections

Pike Esox Lucius Distribution and Feeding Comparisons in Natural and Historically Channelized River Sections

Diet and Reproduction of Largemouth Bass in a Recently Introduced Population, Lake Bracciano (Central Italy)

Growth and reproductive properties of Tench,Tinca tincaLinnaeus, 1758 in Trasimeno Lake (Umbria, Italy)

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