Relative Condition Factor Research Articles

Masculinization of Red Tilapia (Oreochromis spp.) Using 17α-Methyltestosterone-Loaded Alkyl Polyglucosides Integrated into Nanostructured Lipid Carriers.

The aim of the present study was to optimize a masculinization platform for the production of all-male red tilapia fry by oral administration of 30 and 60 ppm of MT and alkyl polyglucoside nanostructured lipid carriers (APG-NLC) loaded with MT, respectively, for 14 and 21 days. The characterization, encapsulation efficiency and release kinetics of MT in lipid-based nanoparticles were assessed in vitro. The results showed that the MT-loaded nanoparticles were spherical, ranging from 80 to 125 nm in size, and had a negative charge with a narrow particle distribution. The APG-NLC loaded with MT provided higher physical stability and encapsulation efficacy than the NLC. The release rate constants of MT from MT-NLC and MT-APG-NLC were higher than those of free MT, which is insoluble in aqueous media. There was no significant difference in survival between the fish administered MT or the those fed orally with MT-APG-NLC fish. According to the logistic regression analysis, the sex reversal efficacy of MT-APG-NLC (30 ppm) and MT (60 ppm), resulted in significantly higher numbers of males after 21 days of treatment compared with the controls. The production cost of MT-APG-NLC (30 ppm) after 21 days of treatment was reduced by 32.9% compared with the conventional MT treatment group (60 ppm). In all the treatments, the length-weight relationship (LWR) showed negatively allomeric growth behavior (b < 3), with a relative condition factor (Kn) of more than 1. Therefore, MT-APG-NLC (30 ppm) would seem to be a promising, cost-effective way to reduce the dose of MT used for the masculinization of farmed red tilapia.

Length-Weight Relationship and Condition Factors of Some Commercial Fish from Youtefa Bay, Jayapura City, Indonesia

In this study, we used data on the length and weight of fish to determine the length-weight relationship and condition factors of eight commercial fish targeted by traditional Papuan fishers in Youtefa Bay, Papua Province, Indonesia. The fish species were Lutjanus fulvus, Gerres oyena, Parupeneus barberinus, Siganus spinus, Siganus canaliculatus, Pelates quadrilineatus. Mugil cephalus, and Hemiramphus far. A total of 245 fish specimens were collected from Papuan fishermen from January to March 2020. The total body length and weight ranged from 15.2 to 32.1 cm (average 20.26±3.73 cm) and 42.72 to 371.86 gr (average 124.10±52.45 gr), respectively. The b value ranged from 2.692 to 3.079, with the coefficient of determination (R2) ranging from 0.902 to 0.995. The growth patterns of the eight fish species were allometric (b≠3; t-test&lt;t-tab), where L. fulvus (2.824), P. barberinus (2.914), S. canaliculatus (2.989), P. quadrilineatus (2.958), M. cephalus (2.910), and H. far (2.692) have negative allometric growth (b&lt;3). In contrast, G. oyena (3.060) and S. spinus (3.079) have positive allometric growth (b&gt;3). The relative condition factor and Fulton condition factor values ranged from 0.874 to 1.201 (average 0.999±0.321) and 0.204 to 2.726 (average 1.612±0.515). M. cephalus had a higher relative condition factor, while L. fulvus had a higher Fulton condition factor compared to other fish species.

Biometric evaluation of the freshwater snail Pila globosa (Swainson, 1822) from the river Ganga in Bihar, India

Length-frequency distribution, morphometry, length-weight relationship, relative condition factor and sex ratio of the apple snail Pila globosa (Swainson, 1822) were studied from the river Ganga. A total of 922 specimens were collected during July 2020 to June 2021, ranging from 3.53 to 62.99 g and from 16.49 to 59.78 mm (shell length). Length-frequency distribution revealed that more than 50% of male and female specimens were within 35 to 45 mm in length and only few (1.58%) female specimens were observed in the higher length (&gt;55 mm). Females have significantly longer shells and are heavier than males. Shell length has the strongest correlation with shell width (r=0.974) and the least with penultimate whorl length (r=0.855). Length-weight relationship, indicated that the species has negative allometric growth (b&lt;3). The relative condition factor was 1.07 for males, 1.00 for females and 1.01 for pooled data. Sex ratio (M:F) statistically deviated from the hypothetical ratio of 1:1, indicating a heterogeneous snail population (1:1.9, p&lt;0.05). Keywords: Ganga River, Growth pattern, Shell morphology, Snail Sex ratio

Inferences about Fishing Impacts on the Reproductive Pattern of Torroto Grunt—Genyatremus luteus (BLOCH, 1790)—From the Amazon Continental Shelf

Genyatremus luteus’ reproductive dynamics were investigated by examining the gonadal first maturation length (L50) and reproductive period (gonadosomatic index, GSI, and relative condition factor, Kr) in relation to the environmental factor rainfall. Sampling was conducted monthly from April 2016 to April 2017, in five areas (A1 to A5) using gill nets and fixed traps. The sex ratio distribution of the 331 specimens captured (174 females, 140 males, and 17 with undetermined sex) did not differ between months. Females were larger (19.28 cm vs. 16.63 cm to males) and heavier (147.21 g vs. 92.14 g to males) and, for both sexes, the means of Kr and GSI indicated the probable spawning period of the species that occurred from June to September, after a decrease in the precipitation of the region. The value of L50 was estimated as 15.13 cm for females, 14.29 cm for males, and 14.78 cm for both sexes. In the rainy season, the behavior of the species is associated with breeding in certain areas but in the dry season, it is related to the fattening and refuge of juveniles and adults. This research shows the first insight for fishing management about a species that requires different ecosystems to complete their life cycle.

Length-weight relationships and condition factors of mono- and mixed-sex Nile tilapia (Oreochromis niloticus) in open water cage culture system

The current study compared the length-weight relationships and condition factors in mono- and mixed-sex Nile tilapia (Oreochromis niloticus). The trial lasted for 91 days and included two treatments with five replications for each, all with the same stocking density. During the study period, 20 randomly selected fish individuals were measured and recorded from each cage every two weeks. The observed growth trend was allometric, with no significant difference in the mean exponential values (b), 2.696 and 2.65 for mono and mixed-sex tilapia respectively. There was a significant difference in final weight gain between monosex (171.58±7.39 g) and mixed-sex (149.09±4.14 g) tilapia. There was no significant difference in final length between monosex (19.80±0.42 cm) and mixed-sex (19.80±0.42 cm) tilapia. Moreover, the mean correlation coefficient (r2) of both groups was positive. The Fulton condition factor (K) also varies from 0.700 to 1.000 (monosex) and 1.000 to 1.010 (mixed-sex). The relative condition factor (Kn) for monosex and mixed-sex tilapia ranged from 1.96 to 2.222 and 2.092 to 2.35 respectively, indicated good aquaculture conditions. The present findings will attract fish farmers to mixed-sex tilapia culture by allowing them to lessen hormone administration and expected to boost national fish production through open water cage aquaculture.

Current status and length–weight relation of the European mudminnow, Umbra krameri (Actinopterygii: Esociformes: Umbridae), from Jieț River, Dolj County, southwestern Romania

The habitat of the European mudminnow, Umbra krameri Walbaum, 1792, is continuously decreasing due to human intervention. The species has a “vulnerable” status according to the IUCN Red List. Thus, new information about the species is needed for conservation efforts. Minnow traps were used for capturing Umbra krameri and other small fishes in the Jieț River, Dolj County, southwestern Romania. Captured specimens of U. krameri were measured and weighed. Length–weight relations and relative condition factor were determined for the captured U. krameri specimens. A total of 94 fishes were captured using the minnow traps. They represented 7 species: European bitterling, Rhodeus amarus (Bloch, 1782), roach, Rutilus rutilus (Linnaeus, 1758), rudd, Scardinius erythrophthalmus (Linnaeus, 1758), Danubian spined loach, Cobitis elongatoides Băcescu et Mayer, 1969, weatherfish, Misgurnus fossilis (Linnaeus, 1758), tubenose goby, Proterorhinus marmoratus (Pallas, 1814), and U. krameri. The specimens of Umbra krameri represented 44% (41 specimens) of the total catch. The wet body weight (BW) of U. krameri ranged from 0.8 to 5.1 g, having a mean value of 2.102 g. The mean total length (TL) was 5.782 cm, ranging from 4.59 to 7.87 cm. According to the length–weight relation (LWR), the growth type of U. krameri was positive allometric based on the determined equation: BW = 0.0068TL3.277. The mean value determined for the relative condition factor (Kn) was 1.0056486. The growth condition of 46% of the specimens was poor (Kn &amp;lt; 1; n = 19), while the other 54% were in good condition (Kn ≥ 1; n = 22). The presently reported study provides information about the presence of U. krameri in the Jieț River (Dolj County, Romania), a location where the species has not been previously reported. The LWRs show an allometric positive growth. The relative condition factor shows that 46% of the specimens had poor growth, while the rest were in good condition. Minnow traps were an efficient tool for small fish capture.

Size structure, length-body mass relationship, and relative condition factor of the crocodile shark, Pseudocarcharias kamoharai, in the Southeastern Pacific Ocean, Ecuador

The crocodile shark, Pseudocarcharias kamoharai, is a species of ecological and economic importance in the marine ecosystems of Ecuador. Although it is a fishery resource for local consumption, biological and ecological information and appropriate fishery management are needed to allow its sustainable use. This research aimed to analyze the population’s size and total body mass structures, determine the length-body mass relationship, and the relative condition factor of the crocodile shark in the Ecuadorian Pacific Ocean. Samples were collected from June 2012 to May 2013 and from June 2017 to May 2018 in Santa Rosa, Ecuador. The size of females (n=202) ranged from 50 to 117 cm total length, while males (n=206) ranged from 72.5 to 110 cm TL. The total body mass for females was between 700 and 7 100 g and from 2 000 to 5 000 g for males. Significant differences were observed between sizes (Mann Whitney test, W= 55 018.50; p < 0.05) and body mass for females and males (W= 56 338.50; p < 0.05). Length-body mass relationship parameters for the combined sexes were a=0.015, b=2.70, R2=0.79; for females: a=0.045, b=2.48, R2=0.80; and for males a=0.098, b=2.28, R2=0.66. In all cases, length-body mass relationship patterns were hypoallometric. The relative condition factor for combined sex ranged between Kr=0.81 and 1.34 (Kr= 0.84–1.34 for females and Kr= 0.81–1.30 for males), demonstrating that this species had a healthy nutritional condition. This study investigates the fishery biology of the species in this region of the Pacific Ocean for a future management plan.

Length-weight relationship and well-being factors of 33 fish species caught by gillnets from the Egyptian Mediterranean waters off Alexandria

This study investigates the growth pattern of 33 fish species caught by gillnets from the Egyptian Mediterranean waters off Alexandria between 2018 and 2020. This is accomplished by studying the length-weight relationship (LWR), Fulton’s condition factor (kc), the allometric condition factor (ka), and the relative weight condition factor (kn). The b-values of the length-weight relationship of the studied species varied between 2.1382 and 3.6868 according to the results. Only Dentex macrophthalmus (b = 2.1382), Etrumeus golanii (b = 2.4197), and Trichiurus lepturus (b = 3.6868) exhibited different values than the expected range of 2.5 < b less than 3.5. The 95 % confidence interval (CI) and Bailey’s t-test of b-values were tested. In terms of growth pattern, the results showed 20 fish species with an isometric growth pattern, 10 fish species with negative allometric growth, and only 3 fish species with positive allometric growth. The study of Fulton’s condition factor (kc) assessed the differences between species to the differences in fish shape, and proposed that each fish family has its own range depending on the fish shape, and (kc > 1) is not necessarily a better condition for the fish. The study of the allometric condition factor (ka) assessed that the difference between ka and kc values influenced by the feeding intensity and the b-value. The values of the relative weight condition factor (kn) were within the range from 0.929 to 1.038, and 24 fish species reflected a good growth condition while the kn values for the remaining 9 species were less than 1.0. The obtained results add new data about specific species and provide updated data on the remaining species in the area of study. The obtained results can have useful effects on the stock assessment of fish species.

A Study of Length Weight Relationship and Feeding Habit in Two Threatened Fish Species Glossogobius giuris and Nandus nandus from Sessa River, Dibrugarh, Assam, North-East India

The present study illustrates the inclusive information of morphological relationships, including morphometric parameters, meristic count, length-length relationships (LLRs), length-weight relationship (LWRs) and feeding biology of two threatened freshwater fish species, Glossogobius giuris and Nandus nandus from Sessa River, Dibrugarh, Assam. All the morphometric parameters revealed a proportional change with the increase in total length of the fish species. The growth coefficient ‘b’ in the LWR for both the fish species G. giuris and N. nandus exhibited values <3 which shows a negative allometric growth. The coefficient of correlation (r) was recorded 0.97 in G. giuris and 0.95 in N. nandus which showed high degree of correlation in the species. The relative condition factor (K) fluctuated between 1.79 and 1.97 respectively, indicating a state of well-being for these fish species. The degree of association between the variables was computed by the determination coefficient, R2. The body lengths were found highly significant with all “r” values being >0.900 and positively correlated with TL. The value of RLG for both the species was <1 which indicates the carnivorous nature of the fishes.

Nematodes as indicators of environmental changes in a river with different levels of anthropogenic impact.

Considering that changes in the biodiversity of parasite communities can be used as indicators of ecosystem health, the aim of this study was to investigate the potential use of Geophagus brasiliensis parasites as bioindicators of environmental changes. We established three sample points in the Iguaçu River, each presenting different degrees of environmental impact. Out of the 69 G. brasiliensis specimens analyzed, 32 (46.3%) were parasitized by at least one parasite. We collected a total of 56 specimens of endoparasites belonging to the phylum Nematoda. Fishes collected in point 3 presented a significantly higher abundance of nematode species (moderately degraded) (Kruskal-Wallis2;69 = 8.62; p = 0.01) and species compositions between points were significantly different (F = 6.95, p = 0.002). No significant difference in relative condition factor (Kn) among the points (F2;66 = 2.54; p = 0.08) or correlation in Kn and abundance of nematodes (rs = 0.1; p = 0.4) were indicated. The results presented in this study indicate that the parasitic community of G. brasiliensis is characterized by low diversity in polluted locations, which explains the absence of certain parasite species and the occurrence of nematode species with varied responses to the pollution gradient.

Aspectos reprodutivos em uma população isolada de Psalidodon aff. fasciatus (Teleostei: Characidae) do sul do Brasil

Abstract: Aim To investigate reproductive characteristics in a small population of Psalidodon aff. fasciatus living in isolation in an environment with a unique geological configuration, a doline-shaped depression (known as Furna 2), with a mean diameter of 80 m and water depth of 50 m, a natural heritage of the Vila Velha State Park (VVSP). Methods The fish were collected between February 2019 and January 2020 using nets and pots; standard length and total weight were measured. The gonads were also removed for histological analysis. Estimates were made for the weight-length ratio, the relative condition factor, the sex ratio, and the size at first maturity (L50 and L95) for males and females. Results The five gonadal stages that were characterized (resting, early mature, mature, partially empty, and totally empty) were consistent with what was expected for the species. The results obtained here indicate that these lambaris have an opportunistic (r) life strategy. Compared to previous studies, we discovered that fish of this population start maturing at smaller sizes. Indicating negative allometric growth, the length-weight ratio was WT = 0.0002 * LT2.3039, and the condition index (Kn = 0.95) showed no significant gender differences. When compared to other non-isolated populations of the same species, the population's sex ratio showed an unexpectedly significant male predominance (1M: 0.6 F). Conclusions Our results show an imbalance in the sex ratio, contrary to what would be expected for non-isolated populations. This imbalance may be related to the complete isolation of this environment, suggesting that females may be affected by some evolutionary force, such as inbreeding. However, other factors cannot be ruled out, as the underlying genetic mechanisms remain unknown, and only future investigations can reveal a more complete understanding of reproduction in isolated populations.

Abundance of Procamallanus (Spirocamallanus) inopinatus (Nematoda: Camallanidae) in Characiformes fish and associated factors in Midwest Brazil.

The success of Procamallanus (Spirocamallanus) inopinatus infection in fish involves a complexity of variables. This study aims to evaluate the relationship between abundance of P. (S.) inopinatus with biometric and somatic parameters, sex, relative condition factor (Kn) and hosts diet, as well as to evaluate length relationship of the parasites and the hosts. The fishes were collected by the mesh method and data, length, weight, sex, gonad and liver weight, Gonadosomatic index (GSI) and hepatosomatic index (HSI), Kn and stomach content were recorded. Twenty-seven specimens of P. (S.) inopinatus were collected in the intestine from Serrasalmus rhombeus and 52 from Leporinus friderici. In general, the prevalence, mean intensity and mean abundance of infection was higher in L. friderici. The total abundance was explained by the variables GSI, HSI total length, gonad and liver weight. Fish relative condition factor (kn) and sex were not influenced by the infection, being that the parasite infection did not impair the body condition of the hosts. There is no relationship between host length and parasite length in any of the evaluated fish species. On average, S. rhombeus parasites are 0.69 cm larger than L. friderici parasites.

No evidence from long-term analysis of yellowfin tuna condition that drifting fish aggregating devices act as ecological traps

Human-induced habitat modifications can severely impact the biology and behavior of wild species. Drifting fish aggregating devices (DFADs), used by industrial purse-seine tropical tuna fisheries, significantly increased the number of floating objects found in the open ocean, with which tropical tuna associate. This habitat change has raised concerns over the risk of modifying the behavior and altering the biology of tuna and other associated species (the so-called ecological trap hypothesis). Relying on a time-series from 1987-2019 of more than 25000 length-weight samples collected in the western Indian Ocean, we reject the hypothesis that the body condition (Le Cren’s relative condition factor, Kn) of yellowfin tuna Thunnus albacares decreased concurrently with the increased number of DFADs. This result suggests the absence of negative long-term impacts of DFADs on the condition of tuna. As other factors may have counteracted possible negative effects of DFADs, we recommend long-term monitoring of the habitat along with biological and behavioral parameters of tunas to detect any critical change.

Brycon hilarii produced in hapas: effects in allometric growth.

Biometric evaluations are essential to determine the growth characteristics related to the weight and length of fish. This study aimed to determine the growth patterns of juvenile piraputangas (Brycon hilarii) produced in hapas within an excavated pond. The piraputangas were anesthetized and micro-chipped and their biometric characteristics were measured. Subsequently, the fish were distributed in six hapas of eight m3 at the density of 20 fish/hapa, totaling 120 animals. During the experimental period six months, the fish were fed twice (5% of the biomass) a day. Every 30 days, all fish were sampled to measure the biometric characteristics of body weight (g); standard length; total length; head height; head length; body height and body width (cm). The calculations of the weight ratio with the biometric characteristics were determined using allometric equation and estimated by linear regression according to the equation log Y = log a + b log X. All tested relationships were significant by the Student t-test (p < 0.05). Allometric growth was positive for: weight x total length; standard weight x length; weight x head height; weight x head length and weight x body height. The relative condition factor of piraputangas observed in this study was 1.00. The study provided information on the allometric parameters of juvenile Brycon hilarii produced in hapas, and the relative condition factor indicated good growth conditions for piraputangas with positive allometric growth.

Biological reproduction variables of scalloped spiny lobster (Panulirus homarus Linnaeus, 1758) in the west coast of Lampung province

The scalloped spiny lobster (Panulirus homarus) is one of the dominant lobster species caught by fishermen in the west coast of Lampung Province. The spiny lobster fishing seems to be high pressure due to the catch result having a reasonable price for domestic and export market. However, little information on the biology of this species in the west coast of Lampung Province is considered for management. This study aimed to analyze the biological reproduction variable of scalloped spiny lobster, i.e., sex ratio, length-weight relationship and relative condition factor, maturity, reproductive potential, and spawning type. The sample was collected by simple random sampling method on the main holding center from October 2021 to March 2022. Results showed that the caught of P. homarus carapace length was in the range of 41-94 mm, the sex ratio was about 1:1.12, there was a negative allometric growth pattern for both sexes, the condition factor, and the gonadosomatic index tended to be increased from October to December, and then decrease. Gonad with fully mature stage (stage III) was found every month for both sexes, and the peak of spawning season occurs in November-December. Fecundity as the reproductive potential of P. homarus was in the range of 762-182,000 eggs, while size at onset maturity or mean size of first spawning was at 63.10 mm carapace length. Spawning patterns tend to be partial spawners. Females of P. homarus below the size at onset maturity are often caught. It is recommended to this fishery that minimum legal size should be applied in the carapace length greater than 64 mm.

Length-weight relationships and relative condition factors of three coral-associated Lutjanus species from Terengganu waters of the South China Sea, Malaysia

Length-weight relationships and relative condition factors of three coral-associated Lutjanus species from Terengganu waters of the South China Sea, Malaysia

Anatomical and histological traits of Brycon amazonicus liver cultivated in a semi-intensive system.

The work aimed to evaluate the weight-length relationship and the condition factor, characterizing the biometry, anatomy, histology and volumetric density of the liver of Brycon amazonicus, in different stages of body growth. The experiment used twenty specimens in four stages of body growth (PI, PII, PIII and PIV) harvested every 90 days, containing five specimens, each group. The livers were dissected, weighed (g) and processed routinely using the hematoxylin and eosin technique. The data were submitted to analysis of variance, Pearson's correlation test and linear regression. The equation that represented the weight-length relation was W = 0.05902 x L2.63, with negative allometric growth, but with a relative condition factor equal to 1.0. The liver was divided into three lobes with the gallbladder close to the right lobe and its color varied from light red to dark red, not varying in relation to other fish species. The hepatosomatic relationship followed body growth until the PII group stage and then declined, demonstrating the behavior of its development in Brycon amazonicus. The organ consists predominantly of hepatocytes, followed by sinusoidal vessels and capillaries, with histological morphology similar to that of many species of fish. Melanomacrophage centers were found only in the most developed animals, but in small quantities, prompting the development of new research on this cell, in this species. In this way, research of this nature allows the characterization of fish species, helping to improve breeding methods, understanding pathological processes caused by diseases, and obtaining better productive capacity, serving an increasingly demanding and prosperous market.

Length-Weight Relationship and Condition Factor of Prussian Carp (Carassius gibelio, Bloch, 1782) from Asi River

This study aimed to determine the length-weight relationship and condition factor of Prussian carp (Carassius gibelio, Bloch, 1782) from the Asi River. Samples were collected by 12-18 mm mesh sized fyke-nets between November and December 2021. Totally 88 specimens have been collected from the Turkish part of Asi River, Hatay, Türkiye. Lengths and weights ranged from 10.2 to 29.8 cm and 19.47 to 408.59 g, respectively. The b-values were calculated as 3.08 and the LWR equation was estimated as W = 0.0138*L3.08. The Fulton’s condition factor (K) and the relative condition factor (Kn) values were calculated as 1.76±0.03 and 1.01±0.01, respectively. This study provides the valuable data on the length-weight relationship and condition factors of C. gibelio from the Asi River. The findings of the present paper revealed that C. gibelio showed an isometric growth and this region is relatively suitable for the growth of this species. Therefore, these data will be a valuable background for further biological studies and local fisheries management strategies.

Relative Condition Parameters for Fishes of Montana, USA

Body condition indices are commonly used in the management of fish populations and are a surrogate to physiological attributes such as tissue-energy reserves. Relative condition factor (Kn) describes the condition of species relative to populations in a geographic area. We developed models to allow for the calculation of Kn in Montana, USA by using the weight–length data collected by Montana Fish, Wildlife &amp; Parks. We generated log10weight–log10length relationships to obtain Montana specific parameter estimates for relative condition equations (W′) for 51 species and three subspecies. We developed separate models by water type (e.g., lotic and lentic) and sex for five species due to varying growth based on sexual dimorphism and varying ecosystem types. Relative condition offers the advantage of describing body condition relative to species in Montana, provides a condition index for species that do not have standard-weight models developed for relative weight (Wr), and affords more information for the global database on weight–length relationships of fishes.

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

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