Search

This study examines skeletal deformities in Labeo catla(Hamilton, 1822) (Teleostei: Cyprinidae) collected from Wainganga River near Pauni city, District Bhandara, Maharashtra. Morphological features of abnormal fish specimens were compared with those of normal fish from the same location. While no marked differences were observed in meristic characters, minor changes were noted in morphometric characters, particularly in the caudal peduncle region. Specifically, the distance between the post-anal fin and the base of the caudal peduncle was shorter in the abnormal specimen (15.4 mm, 4.78% of standard length) compared to the normal specimen (48.37 mm, 11.80% of standard length). Radiographic examinations were conducted to further analyze the deformities. Potential factors contributing to the deformities include insufficient essential nutrients, variations in water quality or chemical contaminants, and genetic mutations during larval development. The study discusses these potential causes and emphasizes the importance of such research in environmental monitoring. This study presents the first documented report of skeletal abnormalities in Labeo catlafrom the Wainganga River in Maharashtra, India.

Background: The present study was performed to determine carapace length–body weight relationship of Charybdis callianassa.In fisheries biology, length–weight relationships are important as they allow for the calculation, by creating a mathematical equation between the two, of the total weight of the fish in a particular group in fish. Such information is helpful for fishery scientists to research the dynamics of development and populations and for public agencies that can maintain and preserve these resources sustainably. Results: A study on the carapace length–body weight relationship of Charybdis callianassa(Herbst, 1789) was made on the northwest coast of India for the first time. The study was based on experimental trawl fishing conducted fortnightly from August 2019 to March 2020.A total of 479 specimens, including 262 males and 217 females from fishing trawler, were examined for their carapace length and total weight. The carapace length ranged from 2.69 to 3.54 cm, and the total weight from 5.26 to 7.36 g. This analysis revealed that the crabs exhibited negative allometric development, as shown by average exponents 'b' = 2.71 for pooled data with high coefficient (r) = 0.91 and r2= 0.83. Conclusions: The carapace length–body weight relationship of Charybdis callianassain relation to sex and carapace was studied in the Mumbai coastal water, India. We found major differences in the average “r2” values of species reported for males (0.89), females (0.79) and pooled data (0.83). Such kind of study is essential for fisheries biology to comprehend the differences in circumstances in small and large specimens that vary with environmental conditions and seasons.