Length-weight relationships and relative condition factor of fish species dwelling in the inland saline river, Luni, India, with a note on the associated risks and encounters obstructing the fish diversity and ecosystem services

Abstract

Luni is an ephemeral and inland saline river flowing through the Thar Desert of India. The present study focusses on the length-weight relationships (LWRs) and condition factor analysis of six native and one invasive alien fish species (Oreochromis mossambicus) collected from the river Luni during the exploratory surveys conducted from October, 2018 to September, 2020. LWRs of native fish species showed negative allometric growth for Aphanius dispar, Cirrhinus mrigalaand Salmostoma bacaila and positive allometric growth for Labeo rohita, Mystus gulio and Systomus sarana. Despite abundant distribution of O. mossambicus in the middle and downstream segments of the river Luni, this study revealed good wellbeing and suitability of this river to native and non-native fish species. This forms the first study that reports the LWRs and Kn value of these fish species from the river Luni, which could be useful for estimating stock characteristics and future evaluation of fish population in this dynamic and fragile ecosystem. Further, results of the present study were also compared with the available literature from nearby and associated ecosystems. The baseline information generated will be helpful in understanding the present status of the fish population and also to carryout ecological studies for their conservation and management in the future.Keywords: Invasive Alien Species, Length-weight relationship, Oreochromis mossambicus, Thar Desert

Geographic Information System-Based Analysis of Fish Diversity Trends of River Meenachil, Southern Western Ghats, Kerala.

“…1,54 The midstream geographical zone of Meenachil River was found to be the most diverse region, which maintained consistently high diversity throughout the study period from 2016 to 2020 despite seasonal variations (Table . 3 & Fig. [9][10][11]. Species richness generally increased with the area sampled.…”

“…From the midstream, diversity and abundance were declining towards the downstream estuarine zone of the river, the Kumarakom station, where the river confluences to Vembanadu Lake (Table .3 & Fig. [9][10][11]. The wide-open channel of the river splits into distributaries of smaller size in the Kumarakom station before its confluences (Fig.…”

“…Fish diversity assessed by Shannon-Weiner Diversity Indices as in Table 3 showed significant seasonal variations in seven different sites along the longitudinal gradient of the river and was depicted through GIS mapping (Fig. [9][10][11]. Neighborhoodbased clustering of sampling sites based on the similarities in their diversity indices is given in Fig.…”

“…9 GIS has been used in conservation biology not just for identifying and mapping a region's biodiversity but also for identifying and prioritizing the conservation areas by examining the habitat features and alterations for the implementation of proper restoration strategies. 10,11 In order to triangulate its own position, the GPS recovery system uses at least three satellites and between 24 and 32 microwave-transmitting medium earth orbit satellites. 12 To positionize deforestation, river pollution, substratum habitat structure, fish faunal variety, and interpolation, those satellites are currently being used.…”

Growth and mortality model of Chacunda gizzard shad Anodontostoma chacunda (Bleeker, 1852) in Tarakan waters, North Kalimantan, Indonesia

“…The condition factor of fish may differ spatially (Kazarinov et al 2023) and temporally (Zahid et al 2022;Jisr et al 2018), among them are caused by differences in food (Orlov and Frenkel 2019) and physicochemical parameters (Wuave and Sabo 2023). Because these biometric units help to understand the general well-being and growth trend of the fish population, the condition factor is significant in fishery evaluation and management (Pathak et al 2022). Das et al (2021) explained that Malaysian waters have a stable temperature, so the main factor in growth is not caused by the change of season and photoperiod of the catch.…”