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
Special Issue - Advances in freshwater ecology in Sub-Saharan Africa
Open Access

Impact of altitude on spring macroinvertebrates and water quality in South West region of Cameroon

We evaluated the impact of altitude on the biodiversity and water quality of 13 springs located from 82 to 1,189m a.s.l. on Mount Cameroon. Despite lower temperature and more oxygen at higher altitudes, diversity, including EPT did not increase. Therefore, African fauna reacts similarly to the faunas of other areas of the world. African species appear to be well adapted to warm and poorly oxygenated water compared to species from other parts of the world.

Int. J. Lim., 59 (2023) 10
DOI: https://doi.org/10.1051/limn/2023010
Open Access

Which barcode to decipher freshwater microalgal assemblages? Tests on mock communities

Microalgae taxa can be identified with short DNA barcodes. Eight primer pairs for 16S and five for 23S were tested in silico and with mock communities including cyanobacteria and eukaryotic microalgae. We conclude that the 23S primer pair ECLA23S_F1/ECLA23S_R1 was the best candidate to decipher freshwater phytoplankton communities.

Int. J. Lim., 59 (2023) 8
DOI: https://doi.org/10.1051/limn/2023008

Use of different indices to assess the ecological status of lake systems in the eastern mediterranean river basin

This study was estimated the correlations between various physicochemical parameters, phytoplankton species, different indices, and to evaluate the ecological status of the lentic systems in the Eastern Mediterranean River basin in Turkey.

Int. J. Lim., 59 (2023) 9
DOI: https://doi.org/10.1051/limn/2023007
Review

The Chironomidae (Diptera) diversity in the Balkan Peninsula spring systems and other small water bodies

There are many types of small waters in the Balkans. They are habitats for Chironomidae. Mountain rheocrenes are inhabited by cold-adapted midges. The fauna of springs in the river valleys is diverse. Midges living in the Skodra L.’ spring system prefer higher water temperatures and hard substrates.

Int. J. Lim., 59 (2023) 6
DOI: https://doi.org/10.1051/limn/2023005

Effects of ABS microplastics on microalgae Chlorella vulgaris and Raphidocelis subcapitata

Chlorella vulgaris and Raphidocelis subcapitata, were exposed to different concentrations of ABS microplastics during 6 days. We observed physiological changes in cell growth and chlorophyll content in response to the concentration and duration of exposure.

Int. J. Lim., 59 (2023) 5
DOI: https://doi.org/10.1051/limn/2023006

Allelopathic effects of Egeria densa on the growth and morphology of Chlorella vulgaris

Effects of E. densa on the the growth and morphology of C. vulgaris with gradient algal density were investigated. The study might provide further insights and knowledge into the interspecific interaction in freshwater ecosystems.

Int. J. Lim., 59 (2023) 4
DOI: https://doi.org/10.1051/limn/2023004

Zooplankton egg bank: characterization and effect of biotic factors on hatching

This study provides information on the structure and composition of the egg bank of a shallow lake and the effect of biotic factors on hatching rates. The results show the dominance of rotifers over cladocerans and copepods and a positive effect of certain biotic factors on hatching.

Int. J. Lim., 59 (2023) 3
DOI: https://doi.org/10.1051/limn/2023002