Growth Indices of Indian Major Carp (Crirhinus cirrhosus) from Fry to Fingerling Stage in the earthen ponds in Gilan Province

Subject Areas : New Technologies in Aquaculture Development

Received: 2021-02-07 Accepted : 2021-02-07 Published : 2014-11-22

Keywords: growth, Gilan, Condition factor, fry, Fingerling, Keywords: Indian carp, Crirhinus cirrhosus, Length and weight,

Abstract :

Abstract[1] In order to assess the viability of rearing an Indian carp species (Crirhinus cirrhosus) under the climatic conditions in the northern part of Iran and to achieve some growth parameters from the larval stage to fingerling, measures were taken to import juveniles of the exotic species, from India and cultivate them in earthen ponds in Shahid Ansari production and propagation centre located in Gilan province. The fry of 180 mg weight and 23 mm average length were released into two ponds at a density of 50 fry per m2. Monthly fry samples were taken, for weight and length biometrical analysis and also determination of the weight gain percentage, average daily growth rate, specific growth rate and Condition Factor. Results have indicated considerable growth in this species, with an increase from the initial weight of 180 mg to an average of 46.3±3.8 mg in 210 days period until the end of November. Average length of 16.7±0.9 was also achieved at the end of the course. The Mrigal's weight -length correlation was defined in an function, from which b Index was obtained equal to 2.723 which reveals an isometric growth in this specie. Studying the Condition Factor of the fry in the 7-month course of the experiment shows a decreasing trend in this index (from 2.3 to 2.1). Average daily growth (ADG) in the fingerling has also been foreboding of fluctuations in this period, being 0.57 g in Aug., 0.39 g in Sep. and in the last months 0.13g in Dec. and 0.5 g in Jan. The specific growth rate (SGR) in Mrigal fingerling in the 7 months was 2.3% as an average, this index has shown a declining trend in the whole period and has fallen to 4.6% in Sep and down to 0.06% in Jan. The weight gain rate has also been estimated at 14842 % during this period. Results revealed that the Mrigal fry's compatibility with the condition in the Gilan province in the warm months of the year, but a growth reduction and a mycosis break-out was observed with decrease in the water temperature. * Corresponding Authors; Email: [e-mail]