The length-weight relationship (LWR) is the most important parameter; those are applied for the assessment of fish health and growth. The present study was carried out to know the gap and provide useful information for fish management and conservation in the Ranikot lotic water body. Five Cyprinidae fish species (Labeo bata, L. pangusia, L. barbus, L. potail, and L. porcellus) were collected from the lotic water body to calculate the LWR in order to assess the population status of the lotic water body. All of the five species showed significant positive correlation (r2=>0.5) between length and weight. The values of the growth exponent ‘b’ in the LWR ranged from 2.089 to 3.193. LWR indicated an isometric pattern of growth for L. barbus (b=2.959) and L. potail (b=2.718), while a little positive allometric growth (b=3.193) was observed in L.pangusia. Furthermore, the negative allometric growth was observed for Labeo bata (b=2.337) and L. porcellus (b=2.089). While, the regression value shows median correlation (r2=<0.8) except L. barbus (r2=0.852) for all other four species. The present investigation is likely to be useful for application in fish biology and fisheries management.
Short Communication · Volume 57, Issue 1, 16 January 2025 · Open Access
Length Weight Relationship of Five Cyprinidae Fish Species from Ranikot Lotic Water Body in Sindh, Pakistan
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Affiliations & Notes ⌄
- 1Department of Zoology, University of Sindh, Jamshoro 2Department of Freshwater Biology and Fisheries, University of Sindh, Jamshoro 3Directorate of Fisheries, Gilgit Baltistan * Corresponding author: laghariyounis@yahoo.com
Article Info ⌄
- Journal:
- Pakistan Journal of Zoology
- Published:
- 16 January 2025
From the article
- In the result, the length and weight show significantly positive correlation (r2=>0.5) in the all species.
- A little positive allometric growth (b=3.193) was observed in L. pangusia, while LWR indicated isometric pattern of growth in L. barbus (b=2.959) and L. potail (b=2.718) and negative allometric growth was observed in Labeo bata (b=2.337) and L. porcellus (b=2.089).
Selected from the article's own text.
Abstract
Materials and methods
The fish samples were collected from the Ranikoat lotic water body, 25˚45’N - 26˚00’N long, 67˚45’E - 68˚00’E, from Jan 2021-Dec2021 (Supplementary Fig. 1). The samples were collected by using hand and drag nets.
A total of 860 specimens of Labeo bata, L. barbus, L. pangusia, L. porcellus, and L. potail were selected for LWR and condition factor study. Fish were measured for total length (cm) and body weight (g) for determination of LWR. Weight of fish was weighed by using a digital electronic balance. For each specimen, length and weight were measured to the nearest 0.1 centimeter and gram, respectively.
The data of LWR was calculated by the formula following Le Cren (1951) as W = a Lb, Where ‘W’ is the weight of fish in grams, ‘L’ is the length of fish in millimeters, while ‘a’ and ‘b’ are constants.
The data on total length and weight were statistically treated by the method of least squares using the equation of Le Cren (1951) as Log W = log a + b log L.
Results and discussion
The LWR of five cyprinidae fish species belonging to the family Cyrinidae were calculated and analyzed in the present study (Table I, Supplementary Fig. 2). In the result, the length and weight show significantly positive correlation (r2=>0.5) in the all species. The value of ‘b’, the growth exponent resulted 2.089-3.193 for the LWR. A little positive allometric growth (b=3.193) was observed in L. pangusia, while LWR indicated isometric pattern of growth in L. barbus (b=2.959) and L. potail (b=2.718) and negative allometric growth was observed in Labeo bata (b=2.337) and L. porcellus (b=2.089). Furthermore, the regression value shows median correlation (r2=<0.8) except L. barbus (r2=0.852) for all other four species.
Table I. Descriptive statistics and parameters of LWR for five freshwater fish species belonging to the family Cyprinidae, collected from Ranikot lotic water body in Sindh, Pakistan.
| Species | N | TL range (cm) | W range (g) | b | a | r2 |
| Labeo bata | 200 | 21.0-25.6 | 11.6-29.8 | 2.337 | 0.337 | 0.688 |
| L. pangusia | 180 | 10.2-21.2 | 23.0-99.7 | 3.193 | 0.874 | 0.771 |
| L. barbus | 170 | 4.1-23.2 | 2.5-128 | 2.959 | 0.848 | 0.852 |
| L. potail | 160 | 10.9-22.3 | 32.0-80.9 | 2.718 | 0.776 | 0.629 |
| L. porcellus | 150 | 10.0-19.1 | 23.0-60.7 | 2.089 | 0.721 | 0.663 |
TL, Total length; W, weight; N, number of specimens; a, intercept; b, regression slope; r2, coefficient of determination.
The present findings may also support the Froese (2006), whereas Trachelyopterus galeatus and Triportheus angulatus showed positive allometric growth. Furthermore, Aequidens tetramerus and A. nuchalis which presented ‘a’ and ‘b’ coefficient <2.5, and T. galeatus b=>3.5.
The growth pattern of fish species is changeable; depending on the season, food availability, population, sex, or physiology ; ; ; . Hence, the LWR in fishes is affected by a number of factors including season, habitat, population, gonad maturity, sex, diet, stomach fullness, health, sample size, preservation techniques and locality ; , differences in the LWRs could potentially be attributed to the combination of one or more of the factors given above.
In the present investigation, it is proved that the growth of fishes is not ideal. There might be various reasons, as discussed above. Furthermore, a detailed study is required to investigate the major reasons. The present outcomes can serve as baseline data for species with no earlier information concerning length-weight relationships and for association in future studies of Ranikot water body. However, these species might be cultured or develop techniques to improve the health of species in this stream water. Furthermore, our results contribute to assess and evaluate the improvement of fisheries in the stream reservoir. This site is ideal for sport fishing as well as for aquaculture purposes. If some positive efforts would be taken in interest, then the government and local communities might earn much more.
Acknowledgement
Authors are grateful to the Department of Freshwater Biology and Fisheries for providing laboratory facilities for completing the experiment.
Funding
The study received no external funds.
IRB approval and ethics statement
The authors declare that the experiment was approved and conducted following the recommendation of the Institutional Ethic Board (IEB) for Care and Use of Animals for Scientific Purposes and Academic Ethics Committee of University of Sindh, Jamshoro.
Supplementary material
There is supplementary material associated with this article. Access the material online at: https://dx.doi.org/10.17582/journal.pjz/20230406090440
Statement of conflict of interest
The authors have declared no conflict of interests.
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