Recent podocopid ostracods from an alpine karst lake in Turkey

This study measures basic physical limnological parameters in the lake water column and describes freshwater ostracods and trace metal concentrations in the surface sediments and in the short cores of an alpine, karst,groundwater-fed lake located in south-west Turkey.

Int. J. Lim., 60 (2024) 9
DOI: https://doi.org/10.1051/limn/2024008
Special issue - Biology and Management of Coregonid Fishes - 2023
Open Access

Spawning behaviour of lake whitefish in Lake Huron revealed by fine-scale acoustic telemetry and Indigenous ecological knowledge

In our study of the spawning behaviour of lake whitefish, we observed fish using a variety of habitat types during the spawning season, including a rocky spawning shoal, sandy substrates, and steeper slopes. Both sexes moved shallower at night and deeper during the day, with males moving more at night and females more during the day. This study could help inform stewardship efforts aimed at lake whitefish spawning habitat restoration and protection.

Int. J. Lim., 60 (2024) 8
DOI: https://doi.org/10.1051/limn/2024007
Special Issue - Advances in freshwater ecology in Sub-Saharan Africa
Open Access

Responses of the macroinvertebrate community to urban wastewater pollution in the upper Ouémé Basin in Benin

This study focuses on the effects of urban wastewater on macroinvertebrate communities in the upper Ouémé basin in Benin. We found similar responses in African invertebrates to those observed in other parts of the world. However, we unexpectedly observed a stronger impact during the wet season than during the dry season. Furthermore, community resilience did not depend primarily on the distance downstream of the wastewater input, but rather on a combination of several factors.

Int. J. Lim., 60 (2024) 7
DOI: https://doi.org/10.1051/limn/2024006

Seasonal changes in cell size of the dominant diatom species in Lake Biwa

We reported the effect of various environmental factors on the cell size change of the dominant diatoms, Aulacoseira ambigua, Aulacoseira granulata, and Fragilaria crotonensis, in Lake Biwa, to know diatoms' seasonal succession and sexual reproduction both of which we have only limited information.

Int. J. Lim., 60 (2024) 6
DOI: https://doi.org/10.1051/limn/2024005
Special issue - Biology and Management of Coregonid Fishes - 2023
Open Access

How diverse is the toolbox? A review of management actions to conserve or restore coregonines

Our paper reviews the restoration and conservation strategies applied towards coregonines (e.g., whitefishes, ciscoes) across Europe, Asia, and North America. The highlighted strategies included 1) stocking of hatchery-reared fish, 2) controlling invasive species, 3) translocating fish, 4) restoring habitat, and 5) eliminating harvest or creating protected areas.

Int. J. Lim., 60 (2024) 5
DOI: https://doi.org/10.1051/limn/2024002

Cladocera (Crustacea; Branchiopoda) from the Brazilian Cerrado – the richness and species composition for Goiás state

Goiás state, situated in the Cerrado biome harbors several water bodies (streams, rivers, wetlands, ponds, reservoirs) belonging to the Paraná, São Francisco, and Tocantins-Araguaia hydrographic regions. However, there are several gaps in the knowledge about the diversity and geographic distribution of aquatic invertebrates in the state, including microcrustaceans of the Superorder Cladocera. In our study, we analyzed data from the literature sources and collected samples in new localities between macrophytes and sediments. The findings suggest the occurrence of 92 species in Goiás state and the presence of five new reports: Scapholeberisfreyi, Grimaldina freyi, Parvalona parva, Chydorusbrevilabris, and Picripleuroxus quasidenticulatus. Alona elisae is endemic for region studied. Such results indicate the megadiversity of cladocerans in Cerrado biome, large than the other countries from the Neotropical zone. Despite the increase in sampling effort for the geographic region studied, many parts of Goiás state are still unsampled. This suggests the still unknown diversity potential for the region.

Int. J. Lim., 60 (2024) 3
DOI: https://doi.org/10.1051/limn/2024003
Open Access

Length–weight relationships of the French pikes Esox spp. (Teleostei, Esocidae)

Two pike species occur in France: the ubiquitous northern pike Esox lucius and the endemic Aquitanian pike Esox aquitanicus living in small tributaries and coastal catchments in South-West of France. For this last species, there are few knowledges. So, tools and data are needed for its management and stock assessment such as length–weight relationships (LWRs). This study provides the first LWR for E. aquitanicus and compares it with data of French E. lucius. Data for both pike species were collected from 1981 to 2022 during the monitoring of the Departmental Angling Federations and the French Agency of Biodiversity (OFB). Data from 3,657 Aquitanian pikes and 5,413 northern pikes were then provided with average sizes and weights respectively 10.7 cm for 20.2 g and 30.2 cm for 339.8 g. Our study highlights that Aquitanian pike is smaller than northern pike, certainly due to the surface area of habitat and the warmer temperature. The a and b parameters are significatively smaller for the Aquitanian pike than those of E. lucius. This should be explained by the poor environments where it lives (sandy substrates, few aquatic vegetation, low biomass) conferring a lower primary productivity.

Int. J. Lim., 60 (2024) 2
DOI: https://doi.org/10.1051/limn/2024001

Assessment of the age and growth of three fin fish species from a tropical estuary (Cochin, west coast of India)

This work provides the first information about the stock status of three fin fishes (Caranxheberi, Etroplussuratensis, and Oreochromis mossambicus) from this estuary. According to prior research, this estuary has seen a species reduction over time. It is vital to first learn about the stock status of the studied species because it is one of the most fished finfish species in this estuary. This study's findings will help formulate sustainable resource management.

Int. J. Lim., 60 (2024) 1
DOI: https://doi.org/10.1051/limn/2023012

Determination of fishing efficiency and selectivity of multifilament trammel nets in pearl mullet, Alburnus tarichi (Güldenstädt, 1814), fishing in Lake Van, Turkey

Pearl mullet is an endemic fish species living in the Van Lake Basin. Furthermore, it is an important species for both the region and Turkey, as it is the most caught fish in inland waters. Therefore, the sustainability of fishing is of utmost importance in terms of fisheries management. This study aimed to determine the the selectivity of multifilament trammel nets in pearl mullet, Alburnus tarichi (Güldenstädt, 1814), fishing in Lake Van. In line with this objective, the multifilament trammel nets with the mesh sizes of 20, 22 and 24 mm were tested. The “SELECT” method was applied to determine the selectivity parameters. According the results, the lengths of the optimum catching using nets with 20, 22 and 24 mm mesh sizes were calculated as 20.76 cm, 22.07 cm and 24.11 cm, respectively. The highest average CPUE in weight was found to be 24 mm (6.007 kg / 100 m / day). Considering the data obtained in the present study, in pearl mullet fishing, the best optimum catch length and CPUE values were determined in multifilament trammel nets with 24 mm mesh size. In conclusion, the present study suggests that the use of 24 mm mesh size in Lake for pearl mullet fishing will be more beneficial in terms of both fish stocks and the local fishermen.

Int. J. Lim., 59 (2023) 11
DOI: https://doi.org/10.1051/limn/2023011