Abstract
The intercept as the coefficient of algebraic relationship between standard length (SL) and total length (TL), the two predominantly used linear dimensions of fin fish species, was referred to growth pattern deduction for rainbow sardine Dussumieriaacuta population in the Bay of Bengal. Monthly rainbow sardine samples were collected from the industrial fishing vessel in the Bay of Bengal over a period of a calendar year. The length-length relationship was formed algebraically as y=a+ bx. Linear relationship between SL and TL for male, female and unsexed populations was constructed separately. Chi-squared test affirmed that sex ratio between male and female did not deviate from the parity (P>0.05). The SL and TL ranges of male were 13.1-16.8and 16.4-20.7 cm respectively, they for female were13.4-17.2 and 16.5-20.9 cm respectively. Slope and intercept showed variation monthly in all length-length relationships regardless of sexes. The generalized SL-TL relationships of male, female and unsexed populations employing pooled data over the study period were TL=1.130SL+1.571 (R=0.908), TL=1.106SL+1.925 (R=0.911), and TL=1.114SL+1.825 (R=0.908) respectively. The correlation coefficients of all monthly and generalized regression analyses of all sex categories were very high (R≥0.786), a fact that explained the associations between two length dimensions were strongly related. Study revealed isometric growth for male in all months, while algometry was apparent for female and unsexed populations in a few months. Present findings of length-length relationship and growth pattern for D. acuta population in the Bay of Bengal would remain useful for future references.
 Res. Agric., Livest. Fish.7(3): 545-551, December 2020
Highlights
Changes of linear dimension describe animal growth and are often used in growth study of fish (King, 1995)
Mousavi-Sabet et al (2016) documented standard length of unsexed population having range from 7.5 to 11.6 cm caught from the Persian Gulf and Oman sea
Total length ranges of the species from two other marine waters of eastern Mediterranean Sea and western Indonesia at place as 14.0 - 16.9 cm and 6.0 - 20.5 cm respectively (Taskavak and Bilecenoglu, 2001; Pauly, et al 1996)
Summary
Changes of linear dimension describe animal growth and are often used in growth study of fish (King, 1995). Several works emphasized the importance of length-length relationships in fisheries biology (Pauly, 1993; Petrakis and Stergiou, 1995; Binohlan and Pauly, 2000; Binohlan et al 2000; Froese and Pauly, 2000; Froese, 2006). Length-length relationships are important for comparative growth studies (Moutopoulos and Stergiou, 2002), and are used as the corollary of growth pattern. Though data on length-length relationships are available for almost all European and North American freshwater and marine fishes (e.g., Petrakis and Stergiou, 1995; Sinovcic et al 2004), but they are still lacking in most tropical and sub-tropical fish species (Martin-Smith, 1996; Harrison, 2001; Ecoutin et al 2005). Present research was undertaken to provide pilot information of growth pattern of D. acuta deduced from length-length monthly data analysis
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