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Relationship of the mean standard length by age class of pumpkinseed Lepomis gibbosus in different freshwater systems: (A) in Europe, (B) in North America, and (C) in Canada. R: Reservoir, A.L: Artificial Lake, L: Lake, C: Canal, M: Marsh, P: Pond, Riv: River, W.B: Water Bodies.
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In the present study, the biology of the pumpkinseed Lepomis gibbosus in the artificial lake of Aoos, located in northwestern Greece, was investigated. The samplings of the pumpkinseed were conducted from the shore using a portable electrofishing device over a 4-month period (July 2021–October 2021). A total of 581 specimens were caught, with an av...
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... The impoundment of Aoos springs is an "alpine type" ecosystem located at an altitude of 1343 m, in the mountainous area of northern Pindos (Figure 1). Abiotic and biotic features of the studied system have been adequately described in [24][25][26][27]. During this study, water temperatures ranged from 7.1 • C to 23.9 • C, the maximum depth was 54 m, and the average conductivity was 145.5 µS/cm. ...
The impoundment of Aoos springs was created in 1990 to facilitate hydroelectric production, and fish fauna has been enriched through the years due to deliberate or accidental fish stockings, with certain invasive alien fish species arising (i.e., Lepomis gibbosus, Carassius gibelio), some of which are ranked among the most dangerous species for global biodiversity. A three-year monitoring survey was conducting to map the nesting areas of Pumpkinseed, L. gibbosus, to assess the effectiveness of electrofishing as an active method to reduce the spread of the corresponding species and to identify the impact of the L. gibbosus on native species. The largest percentage of nests was found in areas with silty-sand bottoms (53.4%) and low vegetation. The potential nesting area was estimated at 1.97 km2 and the area of confirmed nesting was 0.33 km2. The species appeared to nest in a small area, compared to the potential nesting area. The results also indicate that a significant percentage of the target species (71.6% of the total number of species) was removed, with an average time per sampling of 1.2 ± 1 h, whereas the impact on the other native species was minimal. These results are important for designing and implementing programs for the eradication or reduction of L. gibbosus in the impoundment of Aoos springs.
... The high-altitude ALA exhibited a high level of ecosystem stability, as seen by its ability to revert to a stationary state following a short-term disturbance. This was confirmed by the high values of overhead (53.38%) and TST, when compared with EwE estimates in other lakes worldwide (e.g., Awassa: [6], Malawi: [28], Brazil: [29]) and in Greece (Lake Volvi: [4], Lake Trichonis: [5]). The high maturity stage of the ecosystem can be attributed to the elevated values of overhead, representing a substantial reserve of energy [30], as well as the broad feeding spectrum in the diet (SOI: 32.5%) a low biomass/total throughput ratio and a high connectance index. ...
... Towards the observed ecosystem stability in the system, it is worth noting that certain non-endemic fish species, including C. gibelio, C. carpio, and L. gibbosus, have been introduced into the ecosystem. Some of these species are listed among those severely impacting global biodiversity [6] and the local aquatic fauna. For instance, L. gibbosus is considered an invasive species [36], which was dispersed, survived, and reproduced in various locations, spanning a wide range of habitats and occurrences. ...
The ecosystem structure of a Mediterranean high-altitude artificial lake (Aoos Springs, Northwest Greece) was assessed and quantified using the Ecopath with Ecosim model. The artificial lake was created in 1990 for hydroelectric production and the fish fauna has been enriched across years due to deliberate or accidental fish stockings, as well as the introduction of the invasive pump-kinseed (Lepomis gibbosus), which may cause adverse effects on aquatic ecosystems and their biota. The model considered 20 species/taxa groups with biological data gathered during 2021-2022 from field surveys, interviews with recreational anglers and literature. The results revealed that the artificial lake of Aoos is a resilient ecosystem to unexpected events with low intensity of fisheries exploitation. The biomass of the introduced invasive species Lepomis gibbosus is low, due to the low biomass level of its diet, Chironomidae and zoobenthic organisms as well as other fish species.
... Tese seasonal variations in the b value and related growth pattern may relate to diferences in the sampling season, developmental phases, and stomach fullness of fshes at the time [10,11]. Besides, some other factors would afect the b parameter, for example, sex [24], size classes [25], diferent time periods [26,27], or even diferent geographic populations [28]. To increase the Newly recorded LWR to FishBase; + tentative estimation due to limited size range; bold, new maximum record of standard length to FishBase; n, sample size; a and b, regression parameters; Cl, confdence limits; r 2 , coefcient of determination; P, positive allometric growth; I, isometric growth; N, negative allometric growth; S.D., standard deviation (SL, cm; BW, g). ...
The Lancang-Mekong River watershed has extremely high fish biodiversity. With the rapid population growth and economic development in the river basin, fish diversity and fishery resources of this river are experiencing serious threats. Basic biological information on most fish species in the Lancang River, required to improve conservation in this area, is limited. This study aimed to provide new estimates of length-weight relationships (LWRs) by using the linear regression of W = aLb for eight indigenous fish species from the Lancang River, Southwest China. From 2018 to 2021, 534 specimens belonging to 3 families and 8 genera were collected using various types of fishing techniques. Standard length (SL) and body weight (BW) of each specimen were measured to the nearest 0.1 cm and 0.1 g, respectively. This study presents the first public records of LWR parameters of Schizothorax lissolabiatus, Poropuntius huangchuchieni, Tor sinensis, Scaphiodonichthys acanthopterus, Mystacoleucus lepturus, Hemiculterella macrolepis, Glyptothorax lampris, and Schistura porthos. The range of b values for the LWRs was 2.5378–3.1732, and the r2 values for all LWRs estimates ranged from 0.9102 to 0.9952. Intraspecific difference of b values across population and/or season was observed in S. lissolabiatus, T. sinensis, P. huangchuchieni, S. acanthopterus, and M. lepturus. The range of mean condition factor (K) and mean relative weight (Wr) was 0.97–2.39 and 100.29–108.18, respectively. This study updated information for FishBase and provided new record of maximum standard length for five species, namely, S. lissolabiatus, P. huangchuchieni, T. sinensis, S. acanthopterus, and M. lepturus. The findings of this study are essential for the management and conservation of locally indigenous fish and fisheries.
