Figure 2
Showing the morphometric measurements of Pethia ticto from the Ganges River, Northwestern Bangladesh
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The present study illustrates the morphometric relationships including Length-Weight Relationships (LWRs) and LengthLength Relationships (LLRs) using a total of 13 linear dimensions and meristic characters of the threatened ticto barb Pethia ticto (Hamilton, 1822) in the Ganges River through multi-linear dimensions. A sum of 100 specimen of P. tict...
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The present study aims to illustrate the morphometric relationships and meristic characteristics of ticto barb, Pethia ticto from Gomti River, Sultanpur, Uttar Pradesh. A total of 90 specimens ranging from 37-90 mm in total length and 0.82-10.37g body weight were used for morphometric and meristic studies. The sampling was done on monthly basis fro...
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... Individuals of different sizes were captured throughout the year from the Ganges River using regular fishing gears. In this research, it was not possible to collect samples larger than 8 cm sized and 4.64 g weighed, which can be accounted for the selection of fishing tools instead of their disappearance from fishing areas or fishers did not catch where larger sizes reside Nawer et al., 2017;Parvin et al., 2021;Sarmin et al., 2021a). The highest length of C. nama was recorded at 8 cm in the present study which exceeded previous records of 7.0 cm from Deepor beel Assam, India (Borah et al., 2017), 7.4 cm from the Brahmaputra River , and 7.5 cm from the Mathabhanga River in Bangladesh . ...
The Elongate glass-perchlet Chanda nama Hamilton, 1822 is broadly found in Bangladesh, Myanmar, India, Pakistan, and Nepal. Our study represents a detailed report on stock status such as population structure, growth parameter (asymptotic length, L ∞ ; growth coefficient , K; age at zero length, t 0 ; growth performance index, Ø'), life span (t max), mortality (total, Z; natural, M; fishing, F), recruitment pattern, exploitation rate (E) and maximum sustainable yield (MSY) of ray-finned Chanda nama for the first time from the Ganges River of northwestern Bangladesh. A sum of 1260 fish was collected during January to December 2017. The total length (TL) was recorded in the range of 3.3 to 9.9 cm. The negative allometric growth pattern was assessed through the b value < 3.0. Further, the L ∞ was 10.25 cm as well as K was found 0.55 year-1. The Ø' was calculated as 1.762, t 0 was 0.057 years while the t max was estimated as 2.49 years. In addition, the Z, M, and F were obtained as 3.11, 1.63, and 1.48 year-1 , respectively. The trend of recruitment was continual through one peak occurrence in May-July. Length of the first capture (L c 50) observed at TL of 3.32 cm. However, the exploitation rate (E) was assessed as 0.48 whereas the maximum allowable yield (E max) was 0.46. The maximum sustainable yield was estimated as 4.51 metric tons. Consequently, the information from this study would be beneficial for the implementation of a proper management strategy in the Ganges River and the related ecosystems.
... Individuals of different sizes were captured throughout the year from the Ganges River using regular fishing gears. In this research, it was not possible to collect samples larger than 8 cm sized and 4.64 g weighed, which can be accounted for the selection of fishing tools instead of their disappearance from fishing areas or fishers did not catch where larger sizes reside Nawer et al., 2017;Parvin et al., 2021;Sarmin et al., 2021a). The highest length of C. nama was recorded at 8 cm in the present study which exceeded previous records of 7.0 cm from Deepor beel Assam, India (Borah et al., 2017), 7.4 cm from the Brahmaputra River , and 7.5 cm from the Mathabhanga River in Bangladesh . ...
... Traits like girth or body depth (BD) which may be linked to fish body condition and reproductive cycle may be less useful for stock identification (Cadrin, 2000;Geladakis et al., 2018). Nonetheless, fish body condition is itself an important indicator in stock assessment as it may track variation in food availability and ecosystem productivity (Brenden et al., 2003;Nawer et al., 2017). The relative weight (Wr) index is an especially popular fish body condition index among fishery managers as it is less influenced by changes in the length of the fish compared to, e.g., Fulton's condition factor (K) and relative condition factor (Kn) (Brown & Murphy, 1991;Neumann & Murphy, 1991). ...
As a first step in stock identification of estuarine round herring Gilchristella aestuaria, a morphometric analysis of multiple standardised traits and body condition was conducted on samples from sites across the distribution range of the species, including freshwater and estuarine populations. Multivariate analyses, including a principal component analysis (PCA), revealed that sites on the same river system and sites in close geographic proximity tend to share morphometric traits. Most of the variation in PCA was due to caudal fin length (CFL). Single traits were analysed with generalised additive models with river system location as the smooth term. CFL was strongly related to river systems, and to a lesser extent salinity and turbidity. Unlike previous local‐scale studies, this broad‐scale study did not support the notion of ecotypes based on eye diameter. Condition indices like body depth and relative weight were related to climatic conditions, salinity and turbidity, more than to river system. The findings agree with previous studies on phylogenetic history and limited gene flow in G. aestuaria, and suggest variation in environmental productivity that affects body condition in different populations. Subsequent research should examine temporal changes in traits like CFL and body condition based on long‐term seasonal sampling. Safeguarding this potential resource may be enabled by adopting appropriate management methods based on delineation of stocks with different levels of productivity and connectivity, before widespread fishing of this species is promoted.
... During our study, the overall sex ratio varied significantly from the predictable 1:1 ratio (df = 1, χ 2 = 4.06, P < 0.05), whereas Hossain et al. (2008) observed no noticeable variation from the expected 1:1 ratio (df = 1, χ 2 = 0.07, P > 0.05) elsewhere in Bangladesh. Our LFDs showed a lack of C. soborna smaller than 2.7 cm in TL which might be attributed to inappropriate selection of fishing gears rather than their absence from the fishing ground; or else the fishermen did not go where smaller fish occurs (Hossain et al., 2015b(Hossain et al., , 2016b(Hossain et al., , 2017cHossen et al., 2016;Nawer et al., 2017). Hossain (2010a, b) made a similar hypothesis when studying small indigenous species from the Ganges River. ...
Our study illustrates the first complete description on population parameters of Corica soborna including sex ratio (SR), length-frequency distributions (LFDs), length-weight relationships (LWRs), length-length relationships (LLRs), condition factors (allometric, K A , Fulton's, K F , relative, K R , and relative weight, W R), form factor (a 3.0), size at fist sexual maturity (L m) and natural mortality (M W) using multi-model indices from the Ganges River of northwestern Bangladesh. For each individual, the total length (TL), fork length (FL), standard length (SL), and body weight (BW) were measured by digital slide calipers and an electric balance, respectively. A total of 303 individuals (male = 140, female = 163) were collected from the fishers catch during January to December, 2016. The overall SR differed statistically from the expected 1:1 ratio (df = 1, χ 2 = 4.06, P ˃ 0.05). The TL of males and females ranged from 2.7-4.7 cm vs. 2.8-5.0 cm, respectively. The LFDs showed that the 3.99-4.49 cm TL size group was numerically dominant for both sexes. The b values of LWRs (TL vs. BW) indicates negative allometric growth, (b = 2.82 for males and b = 2.63 for females). K F was the best condition for assessing the well-being of this species in the Ganges River. The W R was not significantly different from 100 for males (P = 0.6137) and females (P = 0.6185), indicating that habitat was still in good condition. The a 3.0 were 0.0067 and 0.0050 whereas L m was 3.14 and 3.32 cm for males and females, respectively. Also, M W was 2.55 and 2.50 year-1 , respectively in the Ganges River. In addition, this study estimates the a 3.0 , L m and M W from other water-bodies using the available literature. Finally, these findings will be crucial for further studies to suggest suitable policy for the sustainable management of C. soborna in the Ganges River and surrounding ecosystems.
... Another works on this aspect were found for M. vittatus in two water bodies of India, which was 1:2.5 (Rao and Sharma 1984) and 1:1.5 (Bhatt 1971). The population structure (LFD) of this study revealed that it was rare to sample M. vittatus smaller than 6.53 cm (TL) because of selectivity of fishing gear or their absence from the fishing grounds (Nawer et al. 2017;Azad et al. 2018). We observed that the maximum size of M. vittatus was 16.00 cm (TL) for males and 18.80 cm (TL) for females in the Ganges River. ...
Freshwater catfishes are regarded primarily as a source of food and sport, so they are highly valuable economically. We comprehensively studied life history features of Mystus vittatus, including sex ratio (SR), population structure, growth pattern, condition, form factor (a3.0), sexual maturity (Lm), spawning season, fecundity, mortality (i.e., total mortality (Z), natural-mortality (MW), and fishing mortality (F)), optimum catchable length (Lopt), length at first capture (Lc), and environmental factors (temperature and rainfall) with management policies from the Ganges River during July 2017 to June 2018. SR (1:1.48) differed noticeably from the expected 1:1 ratio (p < 0.05). Total length (TL) ranged from 6.80–16.00 cm for males and 6.53–18.80 cm for females. The growth was negative allometric for both sexes. Fulton’s condition factor was the best one and mean relative weight showed no significant difference from 100 for both sexes that indicates balanced population. Lm was 9.60, 9.70, and 8.80 cm based on the gonadosomatic index (GSI), logistic, and maximum length (Lmax), respectively. Spawning season was April to September and the peak was May to July. Fecundity varied from 5942 to 49,852 (mean ± SD, 11,898 ± 5028) and a positively correlated with TL and BW. Z was 1.80 year−1, Mw was 0.97 year−1, and F was 0.83 year−1. Lopt was 11.14 cm (TL) and Lc was ~ 8.47 cm (TL). Temperature and rainfall both were significantly related with GSI and suitable range of temperature and rainfall for spawning of M. vittatus was 28–34 °C and 200–390 mm, respectively. Long data series pointed that average air temperature was increasing and rainfall was decreasing. By considering all of the above parameters, we can take the proper management actions for M. vittatus and other freshwater catfishes on the Indian sub-continent, to ensure long-term self-sustainability and sustainable harvest for the benefit of fishers and communities.
... Body color is silvery, often stained with red; a black spot is present on the side of the tail anterior to caudal peduncle and immediately behind anal fin and another smaller black spot (frequently absent) is present at the commencement of the lateral line. Fins are often black, sometimes orange in color [3][4][5]13,24,25 . The morphometric and P. ticto has been summarized in Table-1. ...
Pethia ticto, commonly known as two spot barb is a common cyprinid species of many Asian countries like Bangladesh, Bhutan, India, Myanmar, Nepal, Pakistan, Sri Lanka and Thailand. This fish species is euryhaline in nature and inhabits rivers, streams, pools, ponds, lakes, reservoirs etc. Due to the presence of high nutritional value, along with other important small indigenous fish species it has been considered as a source of nutrition for the poor people. It is popular as ornamenta species too and its potential as mosquito bio recorded as Least Concerned species in IUCN Red List of Threatened Species, with increased pressure on its population due to over fishing and other anthropogenic factors, Bangladesh. In Bangladesh, it has been enlisted as vulnerable while in India it has been documented as Lower Risk near Threatened species. Thus, considering this situation, populat Conservation of any fish species needs proper knowledge on its feeding and reproductive biology. The present review has been aimed to consolidate the already documented information on feeding and repr out the lacunae as well as the further scope of research to promote its in-situ conservation as well as fishery.
... On the other hand, meristic is an area of ichthyology which relates to counting quantitative feature of fish, such as the number of fins or scales. Morphometric and meristic counts are very useful for the species identification, sex determination and classification of any fish species in a laboratory or in the fields (Bagenal and Tesch 1978, Dynes et al. 1999, Jayaram 1999, Nawer et al. 2017, Rahman et al. 2019. So, studies on morphometric and meristic features can be constructive tools for exact identification of any species and its classification (Bagenal and Tesch 1978, Hossen et al. 2016, Islam et al. 2020. ...
The present study is illustrated complete morphometric and meristic characteristics of fresh water fish, walking snakehead, Channa orientalis (Bloch & Schneider 1801), using nine linear dimensions and covering different fin-rays (i.e., dorsal fin, D; pectoral fin, P1; pelvic fin, P2; anal fin, A and caudal fin, C) from the wetland ecosystem Gajnar Beel in northwestern (NW) Bangladesh. Total 230 specimens of C. orientalis were collected from the Gajnar Beel in the time of January to December 2018 by several local fishing gears (e.g., cast net, gill net and square lift net (mesh size ranges: 1.5 - 2.5 cm, 1.5 - 2.0 cm, & ~2.0 cm, respectively). Different morphometric lengths were measured to 0.01 cm, and whole body weight (BW) was estimated 0.01 g for each individual. Fin rays and scales (including lateral line scale) were computed by a magnifying glass. All LWRs were highly significant (p<0.0001) with the r2 values ≥0.978. Based on r2 value, LWR by BW vs. TL was the best fitted model among nine equations. However, the LLRs were also significant with r2 values ≥0.992. According to r2 value, LLR by TL vs. SL (TL = a + b × SL) shown the best fitted model among eight equations. The fin formula of C. orientalis is: dorsal: D. 29-35; Pectoral, P1. 12-14; Pelvic, P2. 5-6; Anal, A. 20-22; Caudal, C. 12-14. A double lateral line is present which continued with 12-13 scales in the first line and 26-28 scales in other line. The present study will be helpful for the species identification and resource management of C. orientalis in the Gajner Beel NW Bangladesh and other sub-tropical countries.
... Morphometric and meristic studies of many aquatic species have been done from Bangladesh in the past [23][24][25][26][27][28][29][30][31][32][33][34] . However, many studies 5,9,[35][36][37][38] were conducted region wide on P. heterolepis, but none of these studies covered morphometric and meristic traits together. ...
As morphometric information for Hooghly croaker Panna heterolepis Trewavas, 1977 is absent in the most extensively accessed and world's largest online database for fishes (FishBase); this study was undertaken to provide the complete informative description on morphometric relationships and meristic counts of various fin rays. A total of 200 individuals were sampled from the Bay of Bengal (Bangladesh) during July 2018 to June 2019, using several traditional fishing gears. Meristic counts were computed using a magnifying glass. Body weight (BW) and several length measurements were taken through an electronic balance and digital slide calipers for each individual. LWRs (Length-weight relationships) were calculated as: W = a×L b. All LWRs and LLRs (length-length relationships) were found significant with r 2 ≥ 0.919 (p < 0.0001) and 0.928 (p < 0.001), respectively. BW vs. TL and TL vs. SL were the best fitted models for LWRs and LLRs, respectively. Fin formula was: dorsal, D. 43-55 (VIII-X+i/34-44); pectoral, P. 15-17 (i/14-16); pelvic, Pv. 6 (I/5); anal, A. 7-10 (II/5-8); and caudal, C. 17-19 (ii/15-17). These results will a) make a vital contribution for species identification in the marine and coastal waters of Bangladesh and adjoining countries, and b) provide information for Fish Base.
... Most likely, this growth differences can be attributed to differences in environmental factors, particularly water temperature and food availability (Ahamed and Othomi; 2012). Generally, maximum length is considered as a functional tool for fisheries resource planning and management, and is utmost for the determination of asymptotic length and growth coefficient of fishes Khatun et al.,2019;Ahmed et al., 2012;Hossain et al., 2016bHossain et al., , 2017Nawer et al., 2017;Hossen et al., 2016Hossen et al., , 2018. ...
Life History Traits of Gangetic Scissortail rasbora, Rasbora rasbora (Hamilton,1822) from the Payra River, Southern Bangladesh
... Most likely, this growth differences can be attributed to differences in environmental factors, particularly water temperature and food availability (Ahamed and Othomi; 2012). Generally, maximum length is considered as a functional tool for fisheries resource planning and management, and is utmost for the determination of asymptotic length and growth coefficient of fishes Khatun et al.,2019;Ahmed et al., 2012;Hossain et al., 2016bHossain et al., , 2017Nawer et al., 2017;Hossen et al., 2016Hossen et al., , 2018. ...
The near threatened gangetic scissortail rasbora, Rasbora rasbora (Hamilton, 1822), is an economically important, and nutritionally valuable freshwater food fish in south Asian countries. The present study provides the first inclusive explanation on life-history traits of R. rasbora in the Payra River, southern Bangladesh. This species invites research interest due to its nutritional demand and IUCN red list status. Sampling was carried out using different traditional fishing gears during July to December 2019. For each individual, total length (TL) and standard length (SL) were measured to the nearest 0.01 cm using digital slide caliper, while body weight (BW) was taken by an electronic balance with 0.01 g accuracy. A total of 215 specimens were measured ranging from 2.6-12.5 cm TL and 0.22- 10.65 g BW during this study. The 4.00 to 4.99 cm TL was numerically leading group of the total population. The allometric coefficient (b) of the length-weight relationships (LWRs) indicates negative allometric growth pattern (b<3.00) for R. rasbora in the Payra River. The results also indicate that the LWRs were highly significant (p<0.001) with r2 values >0.963. In addition, The LLR (SL vs. TL) was highly significant (p<0.0001) with a coefficient of determination values of 0.988. The estimated form factor (a3.0) was 0.007 indicating this fish is elongated in body shape and the size at first sexual maturity (Lm) for combined sexes of R. rasbora was calculated as 7.96 (~8.00) cm TL in the Payra River. The allometric condition factor (KA) varied from 0.0063 to 0.0570 and Fulton′s condition factor (KF) varied from 0.3933 to 4.1844. However, KF tended to be lower after 9.0 cm for combined sexes, which may indicate the start of sexual maturation and therefore Lm could be around 8.0 cm TL for R. rasbora. The knowledge about the biological aspects of gangetic scissortail rasbora may be used for improved management tools in the future.
