UGROŽENE VRSTE RIBA U SVIJETU: Labeo bata (Hamilton, 1822) (Cypriniformes: Cyprinidae)

Minor carp Labeo bata is an endangered fish species in Bangladesh. This fish is one of the commercially and nutritionally valuable food fish in Asian countries including Bangladesh, India and Pakistan. L. bata is an important target species for small scale fishermen in Bangladesh who use a variety of traditional fishing gears. However, natural populations are seriously declining due to loss of habitat, siltation in the river basin, indiscriminate killing of fry and fingerlings, water pollution by industrial and domestic waste, agrochemicals and overexploitation. This paper recommends the sustainable conservation measures of this endangered fish species in Bangladesh and neighboring countries.Bata, Labeo bata, je ugrožena vrsta ribe u Bangladešu. Ova vrsta je od komercijalne važnosti te nutritivno vrijedna hrana u azijskim zemljama, uključujući Bangladeš, Indiju i Pakistan. L. bata je važna lovna vrsta za male ribare u Bangladešu koji pritom koriste razne tradicionalne ribolovne alate. Međutim, prirodne populacije ozbiljno opadaju zbog gubitka staništa, zamuljenja riječnih korita, neselektivnog ubijanja mlađi i mladunaca, onečišćenja voda industrijskim i kućnim otpadom, agrokemikalijama i prekomjernim iskorištavanjem. U radu se preporučuju održive mjere očuvanja ove ugrožene vrste riba u Bangladešu i susjednim zemljama

Biometry, sexual maturity, natural mortality and fecundity of endangered halfbeak Dermogenys pusilla (Zenarchopteridae) from the Ganges River in northwestern Bangladesh

1548-1555The present study express the biometry, including length-weight relationships (LWRs) using 12 equations, length-length relationships (LLRs) using 15 equations, condition factors (allometric, KA; Fultonʹs, KF; relative, KR; and relative weight, WR), form factor (a3.0), first sexual maturity (Lm), natural mortality (MW) and fecundity (FT) of Dermogenys pusilla from the Ganges River, northwestern Bangladesh. A sum of 75 individuals was hardly collected using cast net and gill net during July 2013 to June 2014. In our study total length ranged from 6.6–16.1 cm for male and 7.5-15.6 cm for female and fin formula was- dorsal, D. 12 (4/8); pectoral, P1. 11 (2/9); pelvic, P2. 6 (1/5); anal, A. 13-14 (2-3/11-12) and caudal C. 18-20 (4/14-16). All LWRs were highly significant (P r2, BW vs. FL was the best fitted model among 12 equations for both sexes. The analysis of covariance (ANCOVA) revealed significant differences between males and females for LWRs (P P r2 values ≥ 0.940. According to highest value of r2, LLR by TL vs. FL was the best suited model among 15 equations for both genders. Based on Pearson correlation values, KF was highly correlated with BW and TL; thus KF can be used for the wellbeing of this species in the Ganges River. The a3.0 was 0.0025 for male and 0.0024 for female. The Lm was 9.70 cm TL for male and 9.40 cm TL for female. Also, the MW was 1.13, 1.41 year-1 for males and females respectively, and the fecundity was ranged from 620-1544 (mean ± SD = 1125 ± 248). Therefore, the findings of this study would be very effective for sustainable conservation of this endangered species in the Ganges River and surrounding ecosystem

UGROŽENE VRSTE RIBA U SVIJETU: Labeo calbasu (Hamilton, 1822) (Cypriniformes: Cyprinidae)

Orangefin labeo Labeo calbasu is one of the commercially and nutritionally valuable food fish in Asian countries including Bangladesh, India, Nepal, Pakistan, Thailand and China. Unfortunately, natural populations of this species are decreasing due to over-exploitation and various biological changes to its habitats. This article suggests the steps for the conservation of the remnant isolated population of Indian major carps, L. calbasu, in the waters of Asia.Narančastoperajni labeo, Labeo calbasu, je visoko nutritivna vrijedna hrana u azijskim zemljama, uključujući Bangladeš, Indiju, Nepal, Pakistan, Tajland i Kinu. Nažalost, prirodne populacije ove vrste se smanjuju zbog pretjeranog iskorištavanja i raznih bioloških promjena u njihovim staništima. U ovom članku predlažu se koraci za očuvanje ostatka izolirane populacije indijskih velikih šarana, L. calbau, u vodama Azij

UGROŽENE VRSTE RIBA U SVIJETU: Anabas testudineus (Bloch, 1792) (Perciformes: Anabantidae)

Climbing perch Anabas testudineus is commercially important fish in Asian countries, mostly in Bangladesh, China, India, Malaysia, Pakistan, Sri Lanka and Thailand. Also, it is used as valuable food fish in different countries of the world. Nevertheless, its natural populations are seriously declining due to heavy harvest, habitat destruction and other ecological changes to its habitat. This paper recommends actions for the conservation of the long-lasting isolated populations of A. testudineus in Asian countries.Grgeč penjač, Anabas testudineus, je komercijalno važna vrsta ribe u azijskim zemljama, uglavnom u Bangladešu, Kini, Indiji, Maleziji, Pakistanu, Šri Lanki i Tajlandu. Također, koristi se kao vrijedna hrana u različitim zemljama svijeta. Ipak, prirodne populacije ozbiljno opadanju zbog pretjeranog izlova, uništavanja staništa i drugih ekoloških promjena. U članku se preporučuju akcije za očuvanje dugotrajnih izoliranih populacija A. testudineus u azijskim zemljama

Morphometric and meristic traits of three ambassid fish species (Chanda nama, Parambassis lala and Parambassis ranga)

398-405This research describes the first complete and inclusive information on morphometric and meristic characteristics of three Ambassid species (Chanda nama, Parambassis lala and Parambassis ranga) from the Mathabhanga River collected during August 2017 to July 2018. In our study, range of the total length was 2.0–7.2 cm for C. nama; 1.7-3.9 cm for P. lala and 1.9-6.4 cm for P. ranga. All length-weight relationships were highly significant (p r2 values ≥ 0.900 (except W vs. PrDL relationship in P. lala, where, r2 = 0.861). Also, all length-length relationships were highly correlated with r2 values being ≥ 0.900. Based on r2 value, W vs. FL and TL vs. FL was best fitted model for all the three species among the 11 equations. The calculated fin formula is: dorsal, D. 21–22 (VIII/13–14); pectoral, P1. 8–10 (2/6–8); pelvic, P2. 6 (I/5); anal, A. 17-18 (III/14–15); and caudal, C. 20–22 (4/16–18) for C. nama; D. 20–21 (VIII/12–13); P1. 8–9 (1-2/7); P2. 6 (I/5); A. 16-18 (III/13–15); C. 18–20 (4-6/14) for P. lala and D. 20–21 (VIII/12–13); P1. 9–10 (2/7–8); P2. 6 (I/5); A. 18-20 (III/15–17); C. 22–24 (4-6/18) for P. ranga. These outcomes will be a functional tool for identification of Ambassid fishes up to species level in any water-bodies of Bangladesh as well as in the adjacent countries

Length–weight relationships of three Gobiidae species from the Rupsha River in southwestern Bangladesh

This study reports the length–weight relationships (LWRs) of three Gobiidae fish species (Acentrogobius viridipunctatus, Apocryptes bato, and Odontamblyopus rubicundus) from the Rupsha River, southwestern Bangladesh. A total of 388 individuals were sampled using cast nets (mesh size ranges from 1.5 to 3.0 cm), gill nets (mesh size ranges from 2.0 to 3.0 cm) and square lift nets (mesh size ~1.5 cm) from December 2014 to November 2015. Allometric coefficient (b) values were 3.23 for A. viridipunctatus, 2.70 for A. bato, and 2.67 for O. rubicundus, respectively. The first LWRs records for these three Gobiidae species, they can be used online for FishBase as well as in future studies

Life-history traits of Pool barb <em>Puntius sophore</em> (Cyprinidae) in different ecosystems of Bangladesh

1446-1454This study describes the life history traits of Puntius sophore (Hamilton, 1822) including, length frequency distributions (LFDs), length-weight relationships (LWRs), length-length relationships (LLRs), condition factors (allometric, KA; Fulton′s, KF; relative, KR and relative weight, WR), form factor (a3.0), first sexual maturity (Lm) and natural mortality (MW) from different ecosystems of Bangladesh. The LFDs were significantly different between the ecosystems (P b) of LWRs (TL vs. BW) indicated positive allometric growth in the Padma River and in the earthen pond (b > 3.0), but isometric growth was found in the Khoilla beel (b ≈ 3). All LWRs were highly significant (P r2 values are ≥ 0.931. The ANCOVA stated that, the LWRs were significantly difference between the ecosystems (P KF was best for assessing the wellbeing of this species in the surrounding ecosystems. The WR was not significantly different from 100 indicating the habitats were still in good condition for P. sophore. Calculated a3.0 were 0.0162, 0.0225 and 0.0125 in the River, pond and beel, correspondingly. The estimated Lm was 5.60 cm TL in River, 6.30 cm TL in pond and 4.90 cm TL in beel and MW was 1.45, 1.48 and 1.81 year-1 in the River, pond, beel respectively. The findings i.e. growth pattern, relative weight, size at sexual maturity, mortality etc. of this study will be effective for the implications of sustainable management policies and to initiate stock assessment practices in the worldwide different ecosystem

Seasonal Variations of Growth Pattern and Condition of Paradise threadfin <i>Polynemus paradiseus </i> (Polynemidae) from Tetulia River in Southern Bangladesh

582-590A total of 900 individuals (pre-monsoon = 250, monsoon = 350, post-monsoon = 300) of P. paradiseus were collected from the fishers catches during January to December 2014. For each individual, TL (total length) and BW (body weight) were measured with 0.1 cm and 0.1 g accuracy, respectively. Length weight relationship (LWR) was estimated by the equation, W = a × Lb. Length-frequency distributions (LFD) were significantly different between the seasons (P &lt; 0.001). Allometric coefficient (b values) of LWRs (TL vs. BW) indicated isometric growth in pre-monsoon and post-monsoon (b ≈ 3), but negative allometric growth was found in monsoon (b &lt; 3). All LWRs were highly significant (P &lt; 0.001) with all r2 values ≥ 0.984. The LWRs were significantly difference between the seasons (ANCOVA, P &lt; 0.001). The KF is highly correlated with TL (Spearman rank test, P &lt; 0.001) in all the seasons, thus suggesting the best condition factor for assessing the wellbeing of this fish in our study area. Additionally, the WR was significantly different from 100 (Wilcoxon rank test, P = 0.003) in pre-monsoon, which indicates the habitat was in poor condition for P. paradiseus, nevertheless it was not significantly differed in monsoon (P = 0.0186) and post-monsoon (P = 0.423). The calculated Lm was 12.1 cm in TL and form factor was 0.0061 for P. paradiseus in the Tetulia River

Biometric indices and size at first sexual maturity of eight alien fish species from Bangladesh

The biometric indices and size at first sexual maturity of eight alien fish species from several water bodies in Bangladesh were studied for the first time. A total of 273 individuals of eight alien fish species (Barbonymus gonionotus, Clarias gariepinus, Ctenopharyngodon idella, Cyprinus carpio, Hypophthalmichthys molitrix, H. nobilis, Oreochromis niloticus and Pangasianodon hypophthalmus) were collected using traditional fishing gears from June 2014 to May 2015. Among the four condition factors (Allometric condition factor, Fulton’s condition factor, Relative condition factor, and Relative weight) studied, Fulton’s condition factor was the best for assessing the well-being of these alien species in their natural habitat, based on the relationships of condition factors with body weight and total length. The calculated form factor was 0.0270 for B. gonionotus, 0.0077 for C. gariepinus, 0.0119 for C. idella, 0.0194 for C. carpio, 0.0101 for H. molitrix, 0.0092 for H. nobilis, 0.0158 for O. niloticus and 0.0105 for P. hypophthalmus. The size at first sexual maturity was estimated in TL as 12.30 cm for B. gonionotus, 25.53 cm for C. gariepinus, 32.80 cm for C. idella, 18.22 cm for C. carpio, 23.92 cm for H. molitrix, 30.18 cm for H. nobilis, 21.78 cm for O. niloticus, and 21.32 cm for P. hypophthalmus. The present study also calculates form factor and first sexual maturity of these alien species from different water-bodies world over. The findings of this study can be very helpful for sustainable management of these alien species in Bangladesh and similar ecosystems