~ 1395 ~ Journal of Pharmacognosy and Phytochemistry 2018; 7(2): 1395-1398 E-ISSN: 2278-4136 P-ISSN: 2349-8234 JPP 2018; 7(2): 1395-1398 Received: 10-01-2018 Accepted: 12-02-2018 Ashish Kumar Maurya College of Fisheries (Central Agricultural University, Imphal) Tripura, India KV Radhakrishnan College of Fisheries (Central Agricultural University, Imphal) Tripura, India Priyanka Sahu College of Fisheries (Central Agricultural University, Imphal) Tripura, India Laxmi Prasad Narendra Deva University of Agriculture & Technology, Kumarganj, Faizabad, Uttar Pradesh, India Shakila Khan Narendra Deva University of Agriculture & Technology, Kumarganj, Faizabad, Uttar Pradesh, India Ravi Kumar ICAR-National Research Centre on Integrated Farming, Piprakothi, Motihari, Bihar, India Correspondence Ashish Kumar Maurya College of Fisheries (Central Agricultural University, Imphal) Tripura, India Length weight relationship and condition factor of Anabas testudineus (Bloch, 1792) from Rudrasagar Lake (A Ramsar site), Tripura Ashish Kumar Maurya, KV Radhakrishnan, Priyanka Sahu, Laxmi Prasad, Shakila Khan and Ravi Kumar Abstract The aim of this study was to assess the length-weight relationship as well as condition factor of a medium sized freshwater fish species i.e. Anabas testudineus from Rudrasagar Lake, a Ramsar site, Tripura. For the aforesaid purpose, a total of 312 fish specimens were collected from June 2015 to December 2015 following random sampling approach using different types of fishing gears as gill net, cast net and drag net of various mesh sizes. The results revealed intercept ‘a’ and slope ‘b’ value as -1.868 and 3.044, respectively with R 2 = 0.99 at 95% confidence limit. This indicates growth in the species is isometric and statistically significant correlation found between length and weight of sampled fish. Isometric growth indicates that the shape of fish does change as it grows. The computed value of Fulton’s condition factor ranged from 1.25 to 1.84 indicating good health condition of the fish. The average K value was obtained as 1.51 which is a sign of good health status of fish as well as its habitat. This study is useful in providing relevant information in understanding the biology of the fish, estimation of fish condition in its environment and in the assessment of population dynamic parameters. Keywords: Anabas testudineus, Length weight relationship, Condition factor, Rudrasagar Lake, Ramsar site Introduction The length-weight relationship study is an approach to assess basic biological parameters fish population, widely considered in fisheries management as it provides information on stock’s condition [1] . This relationship is used by fishery researchers and managers for two main purposes: one is to predict the weight from the length of a fish and second to compare the average associated parameters between fish groups spatially or temporally [2] . The morphometric relationships between length and weight can be used to assess the well-being of individuals and to determine possible differences between separate unit stocks of the same species [3] . Length-weight relationships analysis is done to predict weight from length measurements made in the yield assessment [4] . The fishes can have either isometric or allometric (negative or positive) growth. The isometric growth is associated with constant change of body shape in proportion to the size or length of an organism. The negative allometric growth means that the fish becomes more slender as it increases in length while positive allometric growth indicates relatively deeper-bodied as it increases in length [5] . It is an important tool for getting facts on the increment in weight as a function of length in that way monitoring the healthiness of the fish species under study [6, 7, 8] . In addition, length-length relationships are also important in fisheries management for comparative growth studies [9] . The condition factor is a measure of various ecological and biological factors such as degree of fitness, gonadal development and the suitability of the environment with regard to the feeding condition [10] . When condition factor value is higher it means that the fish is in a better condition. The condition factor of fish can be affected by a number of factors such as stress, sex, season, availability of feeds, and other water quality physico-chemical parameters [11] . The different values of condition factor ‘K’ is indicative of the state of degree of food source availability in its habitat [12] . To the best of knowledge no information is available on the length weight relationship and condition factor of Anabas testudineus from Rudrasagar Lake. The current study was planned to study the length-weight relationship as well as the condition factor of Anabas testudineus occurring in Rudrasagar Lake, a Ramsar site in Tripura. Materials and Methods Study area Rudrasagar Lake is located in Melaghar district of Tripura State between latitude 23°29’ N and longitude 90°01’ E.