UGROŽENE VRSTE RIBA U SVIJETU: Plotosus canius Hamilton, 1822 (Siluriformes: Plotosidae)

Gray eel catfish Plotosus canius is a vulnerable species in Bangladesh. The wild populations are declining as a result of over-exploitation, destruction of spawning grounds, various ecological changes in their natural habitats and lack of appropriate management. Establishment of suitable sanctuaries in selected areas of estuaries, streams, canals and lakes is suggested for the conservation of the populations.Sivi jeguljoliki som, Plotosus canius, je osjetljiva vrsta u Bangladešu. Divlje populacije opadaju kao rezultat pretjeranog iskorištavanja, uništavanja staništa za mrijest kao i raznih ekoloških promjena u njihovom prirodnom staništu te zbog nedostatka odgovarajućeg gospodarenja. Za očuvanje populacije predlaže se uspostava rezervata u odabranim područjima estuarija, potoka, kanala i jezera

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

UGROŽENE VRSTE RIBA U SVIJETU: Eutropiichthys vacha (Hamilton, 1822) (Siluriformes: Schilbeidae)

River catfish Eutropiichthys vacha is one of the foods high in nutritional value in Asian countries. However, natural populations have seriously declined or are on the verge of extinction due to over-exploitation and various ecological changes in its natural habitats, leading to an alarming situation which deserves high conservation attention. This paper suggests conservation measures that should be taken into account towards the preservation of the remnant isolated population of E. vacha in Asian countries.Riječni som, Eutropiichthys vacha, služi kao komercijalno visoka, nutritivno vrijedna hrana u azijskim zemljama. Međutim, prirodne populacije ozbiljno su opale ili su na rubu izumiranja zbog prekomjernog iskorištavanja i raznih ekoloških promjena u svojim prirodnim staništima, što dovodi do alarmantne situacije te je potreban visok stupanj zaštite. U radu se predlažu mjere zaštite koje treba uzeti u obzir kako bi se očuvao ostatak izolirane populacije E. vacha u azijskim zemljama

UGROŽENE VRSTE RIBA U SVIJETU: Pethia ticto (Hamilton, 1822) (Cypriniformes: Cyprinidae)

The threatened Ticto barb Pethia ticto is a small indigenous fish species widely distributed in the natural waters of Asian countries. Previously it was known as Puntius ticto. Natural populations have been reduced seriously to the verge of extinction due to excess exploitation and ecological changes in their natural habitats. This paper suggests the actions for the conservation of the remaining isolated population of P. ticto in Asian countries.Ugrožena indijska autohtona vrsta, Pethia ticto, široko je rasprostranjena u prirodnim vodama azijskih zemalja. Ranije je bila poznata kao Puntius ticto. Prirodne su populacije ozbiljno smanjene te na rubu izumiranja zbog viška eksploatacije i ekoloških promjena u njihovim prirodnim staništima. U radu se predlažu mjere za očuvanje preostalih izoliranih populacija P. ticto u azijskim 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: Botia dario (Hamilton, 1822) (Cypriniformes: Cobitidae)

Bengal loach Botia dario is a valuable food fish in South Asian countries including Bangladesh, Bhutan, India and Nepal. However, the wild population is declining due to heavy harvest, habitat loss and its ecological changes. This paper suggests actions for the conservation of the lasting isolated populations of B. dario in Asian countries.Benegalski vijun, Botia dario, u južnim azijskim zemljama, uključujući Bangladeš, Butan, Indiju i Nepal, ima visoku važnost u prehrani. Međutim, divlje populacije su u opadanju zbog teškog iskorištavanja, gubitka staništa i ekoloških promjena. U ovom članku se predlažu akcije za očuvanje posljednjih izoliranih populacija B. dario u azijskim zemljama

UGROŽENE VRSTE RIBA U SVIJETU: Rhinomugil corsula (Hamilton, 1822) (Mugiliformes: Mugilidae)

Mullet Rhinomugil corsula is a threatened fish of the family Mugilidae and used as food fish in Asian countries but its natural populations have declined due to over-exploitation and various ecological changes in its natural habitats leading to an alarming condition and deserving high conservation importance. This paper recommends measures for the conservation of the remnant isolated wild populations of R. corsula in Asian countries.Cipal, Rhinomugil corsula, je ugrožena vrsta iz porodice Mugilidae i koristi se kao hrana u azijskim zemljama. Prirodne populacije opadaju zbog pretjeranog iskorištavanja i raznih ekoloških promjena u njihovim prirodnim staništima što dovodi do zabrinjavajućeg stanja i zaslužuje veliku važnost u svrhu njihovog očuvanja. U radu se preporučuju mjere zaštite ostatka izoliranih divljih populacija R. corsula u azijskim zemljama

UGROŽENE VRSTE RIBA U SVIJETU: Mastacembelus armatus (Lacepede, 1800) (Synbranchiformes: Mastacembelidae)

Spiny eel Mastacembelus armatus is one of the economically important species both as food and for aquarium trades in Asian countries but the natural population is decreasing due to over-exploitation and for various ecological imbalances including the changes in its natural habitats. This paper suggests steps for the sustainable conservation of the remnant isolated population of M. armatus in the natural water-bodies of Asian countries.Mastacembelus armatus jedna je od gospodarsko važnijih vrsta, kao hrana i kao akvarijska vrsta u azijskim zemljama. Prirodni prirast se smanjuje zbog eksploatacije i različitih ekoloških neuravnoteženosti, uključujući promjene prirodnog staništa. Predlažu se koraci za održivo očuvanje ostatka izolirane populacije M. armatus u prirodnim vodenim staništima u azijskim zemljama

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