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International Journal of Limnology

Volume 60 (2024) (in progress)

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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 5

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.


Seasonal changes in cell size of the dominant diatom species in Lake Biwa 6

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.


Cladocera (Crustacea; Branchiopoda) from the Brazilian Cerrado – the richness and species composition for Goiás state 3

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.

Open Access

Length–weight relationships of the French pikes Esox spp. (Teleostei, Esocidae) 2

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.


Assessment of the age and growth of three fin fish species from a tropical estuary (Cochin, west coast of India) 1

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.