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Za procjenu akvakulture, dužinsko-maseni odnos i faktor kondicije smatraju se standardnim metodama za određivanje rasta ribe, njihova zdravlja i potencijalnog prinosa. Jednogodišnje istraživanje je provedeno radi izračunavanja dužinsko-masenih odnosa (LWRs) i faktora kondicije (K) za sedam ribljih vrsta, Schizothorax niger, S. curvifrons, Cyprinus carpio, Carassius carassius, Pethia conchonius, Crossocheilus diplochilus i Gambusia holbrooki u jezeru Manasbal. Rezultatima je utvrđeno da četiri ulovljene vrste riba (S. niger, S. curvifrons, C. diplochilus i G. holbrooki) pokazuju negativan alometrijski rast, dok su druge vrste riba (C. carpio, C. carassius, P. conchonius) pokazale pozitivan alometrijski rast. LWR je bio značajan pri P < 0,01 u svih sedam vrsta riba, s koeficijentom determinacije (R2) u rasponu između 0,73 i 0,96. K je bio viši kod C. carpio nego kod C. carassius, P. conchonius, G. holbrooki, C. diplochilus, S. niger i S. curvifrons. Trenutna studija koja daje LWR i faktor kondicije sedam vrsta riba iz jezera Manasbal, Kašmir bit će korisna za upravljanje ribljim vrstama, kao i za procjenu ekološkog stanja jezera., For aquaculture assessments, the length-weight relationship and condition factor are considered standard methods for determining fish growth, its health and the potential yield. A year-long study was conducted to calculate length-weight relationships (LWRs) and condition factor (K) for seven fish species, Schizothorax niger (Alghad snowtrout), S. curvifrons (Sattar snowtrout), Cyprinus carpio (Common carp), Carassius carassius (Crucian carp), Pethia conchonius (Rosy barb), Crossocheilus diplochilus (Kashmir latia) and Gambusia holbrooki (Mosquito fish) in Manasbal Lake. The results revealed that four captured fish species (S. niger, S. curvifrons, C. diplochilus and G. holbrooki) exhibited negative allometric growth, while other fish species (C. carpio, C. carassius, P. conchonius) exhibited positive allometric growth. LWR was significant at P < 0.01 in all seven fish species, with a coefficient of determination (R2) ranging between 0.73 to 0.96. The K was higher in C. carpio than C. carassius, P. conchonius, G. holbrooki, C. diplochilus, S. niger and S. curvifrons. The current study providing the LWRs and condition factor of seven fish species from Manasbal Lake, Kashmir will be helpful for the management of fish species as well as for assessing the ecological condition of the Lake.

The present study reflects the seasonal variation of macrobenthic invertebrates from Aripal and Watalara streams in Kashmir Himalaya. During the study, a significant difference (p<0.05) was observed in the density of Annelida, Mollusca, and Arthropoda on a seasonal scale. Macrobenthic invertebrates were found to be at their highest density during summer and autumn, whereas they were recorded lowest during winter and spring. The total density during summer and autumn was found to be significantly different (p<0.05) when compared to winter and spring seasons. The data also depicted the maximum density of Arthropoda followed by Mollusca and Annelida. The study reveals the seasonal stability of the stream ecosystem within the temperate region and also provides the baseline information for macrobenthic invertebrate community structure.

Diversity, abundance and distribution pattern of the fish fauna are important aspects that need to be considered in order to frame the conservation and management strategies in any water body. To assess the composition, diversity and relative abundance of the fish fauna in the Manasbal Lake of Kashmir, the present study was carried out for two years (March 2018 - February 2020). A total of 22522 fish specimens were netted out during the sampling period, and the relative abundance and various diversity indices were used to assess the overall diversity of the inhabiting fish fauna. A total of 7 species belonging to two families, Cyprinidae and Poeciliidae, were reported, of which the family Cyprinidae was dominant in the catch. The relative abundance and diversity of the fish fauna showed spatio-temporal variation wherein Pethia conchonius was most abundant during spring and winter, while Gambusia holbrooki was most abundant during summer and autumn. Cyprinus carpio was found to be abundant during all the seasons at Site II and Site III as compared to native cyprinids, Schizothorax niger and S. curvifrons. The current study also indicated a good fish diversity in the lake which varies on spatio-temporal scales, showing maximum diversity during winter (Hʹ =1.498) and minimum diversity during summer (Hʹ = 1.247), while Site II showed maximum diversity (Hʹ =1.369) and Site I showed minimum diversity (Hʹ =1.085). Overall lake possesses good fish diversity that could be a great source of income for the local populace provided the fish assemblages are sustainably managed., Raznolikost, zastupljenost i distribucija ihtijofaune važni su aspekti koje je potrebno uzeti u obzir kako bi se provele strategije očuvanja i upravljanja u bilo kojem vodnom tijelu. Ovo istraživanje provedeno je u razdoblju od dvije godine (od ožujka 2018. do veljače 2020.) radi procjene sastava, raznolikosti i relativne abundancije ihtiofaune u jezeru Manasbal u Kašmiru, Ukupno je 22522 riblje jedinke ulovljeno tijekom razdoblja uzorkovanja, a relativna brojnost i različiti indeksi raznolikosti korišteni su za procjenu ukupne raznolikosti postojeće riblje faune. Utvrđeno je ukupno 7 vrsta koje pripadaju u dvije porodice, Cyprinidae i Poeciliidae, od kojih je u ulovu dominirala obitelj Cyprinidae. Relativna brojnost i raznolikost riblje faune pokazala je prostorno-vremenske varijacije gdje je Pethia conchonius bila najzastupljenija vrsta tijekom proljeća i zime, dok je Gambusia holbrooki bila najbrojnija tijekom ljeta i jeseni. Utvrđeno je da je Cyprinus carpio prisutan tijekom svih godišnjih doba na lokalitetu II i lokalitetu III u usporedbi s domaćim ciprinidima, Schizothorax niger i S. curvifrons. Ova studija također je ukazala na dobru raznolikost riba u jezeru koja varira na prostorno-vremenskim ljestvicama, pokazujući maksimalnu raznolikost tijekom zime (Hʹ = 1,498) i minimalnu raznolikost tijekom ljeta (Hʹ = 1,247), dok je lokacija II pokazala maksimalnu raznolikost (Hʹ = 1,369), a lokacija I pokazala je minimalnu raznolikost (Hʹ = 1,085). Sveukupno ovo jezero posjeduje dobru riblju raznolikost koja bi mogla biti izvrstan izvor gospodarstva za lokalno stanovništvo pod uvjetom da se ribljim zajednicama upravlja održivo.

The present study reflects the seasonal variation of macrobenthic invertebrates from Aripal and Watalara streams in Kashmir Himalaya. During the study, a significant difference (p<0.05) was observed in the density of Annelida, Mollusca, and Arthropoda on a seasonal scale. Macrobenthic invertebrates were found to be at their highest density during summer and autumn, whereas they were recorded lowest during winter and spring. The total density during summer and autumn was found to be significantly different (p<0.05) when compared to winter and spring seasons. The data also depicted the maximum density of Arthropoda followed by Mollusca and Annelida. The study reveals the seasonal stability of the stream ecosystem within the temperate region and also provides the baseline information for macrobenthic invertebrate community structure.

The morphometric analysis was carried out in indigenous cyprinid food fish, Schizothorax labiatus (a species of snow trout) collected from Vishav stream, a perennial cold water stream of Kashmir valley, India, wherein various morphometric characters viz., Total Length (TL), Standard Length (SL), Fork Length (FL), Pre-dorsal Length (PDL), Pre-pectoral Length (PPL), Pre-pelvic Length (PPeL), Pre-anal Length (PAL), Anal Fin Length (AL), Head Length (HL), Height of Dorsal Fin (HOD), Snout Length (SnL), Body Depth (BD), Eye Diameter (ED), Inter Orbital Length (IOL), Caudal Fin Length (CL) and Caudal Depth (CD) of 104 fish specimens were measured, correlated and analysed. The morphometric data was calculated in the percentage of total length except SnL, ED and IOL which were calculated in the percentage of HL. The result revealed that the correlation coefficient ranged from 0.770 to 0.995 in proportion to TL and 0.706 to 0.859 in proportion to HL which indicates that all the morphometric characters are highly correlated. All the correlations were significant at the level of p<0.01. During the investigation, the results revealed that in the % of TL, 8 characters were found to be genetically controlled 4 characters as intermediate and none character as environmentally controlled one. In the % of HL, 1 character was found to be included in intermediate character, 2 characters in environmentally controlled characters and none in purely genetically controlled one. As revealed by the regression analysis of different morphometric characters in proportion to TL, the maximum growth was obtained for FL (b = 0.9664) and the minimum growth was obtained for AL (b = 0.0655) and in proportion to HL, the maximum growth was obtained for IOL (b = 0.4689) and the minimum growth was obtained for ED (b = 0.0852).

The morphometric analysis was carried out in indigenous cyprinid food fish, Schizothorax labiatus (a species of snow trout) collected from Vishav stream, a perennial cold water stream of Kashmir valley, India, wherein various morphometric characters viz., Total Length (TL), Standard Length (SL), Fork Length (FL), Pre-dorsal Length (PDL), Pre-pectoral Length (PPL), Pre-pelvic Length (PPeL), Pre-anal Length (PAL), Anal Fin Length (AL), Head Length (HL), Height of Dorsal Fin (HOD), Snout Length (SnL), Body Depth (BD), Eye Diameter (ED), Inter Orbital Length (IOL), Caudal Fin Length (CL) and Caudal Depth (CD) of 104 fish specimens were measured, correlated and analysed. The morphometric data was calculated in the percentage of total length except SnL, ED and IOL which were calculated in the percentage of HL. The result revealed that the correlation coefficient ranged from 0.770 to 0.995 in proportion to TL and 0.706 to 0.859 in proportion to HL which indicates that all the morphometric characters are highly correlated. All the correlations were significant at the level of p<0.01. During the investigation, the results revealed that in the % of TL, 8 characters were found to be genetically controlled 4 characters as intermediate and none character as environmentally controlled one. In the % of HL, 1 character was found to be included in intermediate character, 2 characters in environmentally controlled characters and none in purely genetically controlled one. As revealed by the regression analysis of different morphometric characters in proportion to TL, the maximum growth was obtained for FL (b = 0.9664) and the minimum growth was obtained for AL (b = 0.0655) and in proportion to HL, the maximum growth was obtained for IOL (b = 0.4689) and the minimum growth was obtained for ED (b = 0.0852).

The study was conducted to assess the growth and survival of Macrobrachium rosenbergii in earthen culture ponds in order to know about the growth potential of M. rosenbergii in mono as well as polyculture conditions in Jammu. Polyculture experiments of prawn with some selected carps Indian Major Carps (Cirrhinus mrigala and Labeo rohita) and Exotic Carps (Cyprinus carpio) were undertaken in 3 freshwater ponds for duration of 4 months. Under the monoculture conditions, prawns attained an average size of 10.40 ± 0.17 cm weighing 23.84 ± 0.32 g in 4 months and the survival rate was found to be more than 75%. The growth rate of prawns was found to increase steadily during the first half (upto mid-October) after which a decline in the growth rate was evident as the mean temperature reached below 18°C. In the polyculture ponds the prawns attained an average size of 10.10 ± 0.03 cm weighing 18.39 ± 0.89g (without C. carpio) and 8.4 ± 0.36 cm weighing 15.23 ± 0.36 g (with C. carpio) in 4 months and their survival rate was less than 70%. Prawns being benthic feeders utilized the leftover food (of the fishes) that settled at the bottom, therefore, saving the feed cost. It was observed that mean size of the fish attained in the polyculture practice was almost similar to that obtained in the monoculture. The ideal prawn polyculture should be practiced with fast growing compatible carps such as Rohu and grass carp. Bottom feeder carps such as Mrigal (C. mrigala) should be avoided in prawn polyculture practice as they compete with prawns in feeding.

The study was conducted to assess the growth and survival of Macrobrachium rosenbergii in earthen culture ponds in order to know about the growth potential of M. rosenbergii in mono as well as polyculture conditions in Jammu. Polyculture experiments of prawn with some selected carps Indian Major Carps (Cirrhinus mrigala and Labeo rohita) and Exotic Carps (Cyprinus carpio) were undertaken in 3 freshwater ponds for duration of 4 months. Under the monoculture conditions, prawns attained an average size of 10.40 ± 0.17 cm weighing 23.84 ± 0.32 g in 4 months and the survival rate was found to be more than 75%. The growth rate of prawns was found to increase steadily during the first half (upto mid-October) after which a decline in the growth rate was evident as the mean temperature reached below 18°C. In the polyculture ponds the prawns attained an average size of 10.10 ± 0.03 cm weighing 18.39 ± 0.89g (without C. carpio) and 8.4 ± 0.36 cm weighing 15.23 ± 0.36 g (with C. carpio) in 4 months and their survival rate was less than 70%. Prawns being benthic feeders utilized the leftover food (of the fishes) that settled at the bottom, therefore, saving the feed cost. It was observed that mean size of the fish attained in the polyculture practice was almost similar to that obtained in the monoculture. The ideal prawn polyculture should be practiced with fast growing compatible carps such as Rohu and grass carp. Bottom feeder carps such as Mrigal (C. mrigala) should be avoided in prawn polyculture practice as they compete with prawns in feeding.

The present study was carried out to study the feeding habits of Labeo rohita from culture ponds of Gho-Manhasa fish farm, Jammu. Monthly samples were collected from the ponds to study the gut contents. In case of L. rohita in LrfI (lowest size group) and LrfII, LrfIII 40 guts/group, LrfIV 50 guts (due to non-availability of the size categorized) and 120 guts each in case of LrfV and LrfVI (largest size group) were analysed. For every group 10 guts/month were analysed to study feeding ecology in case of L. rohita. Individual stomach fullness scale was estimated to a subjective scale, ranging from 0 (empty) to 5 (full). The results so obtained were used to compute percentage volume of food items in the gut (%V), percentage of ocurrence of guts having particular food item (%0) and Index of preponderance (IOP). The food of Labeo rohita consisted of plant (algae and macrophytes) and animal matter (protozoa, rotifers, cladocerans, copepods, molluscs, annelids and insects) besides unidentified matter (UM), sand/mud and detritus. Of the total 420 specimens analyzed, only 84 (20%) were found with empty guts and 336 (80%) were found with food components. Index of Preponderance (IOP) revealed that algae, along with protozoans, rotifers and cladocerans were the most preferred food items in the smaller size groups and marked a decline as the size of the fish increased. In the advanced stages, macrophytes, detritus and sand/mud were Found to form a major share of food. Subsequently rohu has been categorized as omnivore-planktophage in early stages of life and herbi-omnivore in adult stages.

The present study was carried out to study the feeding habits of Labeo rohita from culture ponds of Gho-Manhasa fish farm, Jammu. Monthly samples were collected from the ponds to study the gut contents. In case of L. rohita in LrfI (lowest size group) and LrfII, LrfIII 40 guts/group, LrfIV 50 guts (due to non-availability of the size categorized) and 120 guts each in case of LrfV and LrfVI (largest size group) were analysed. For every group 10 guts/month were analysed to study feeding ecology in case of L. rohita. Individual stomach fullness scale was estimated to a subjective scale, ranging from 0 (empty) to 5 (full). The results so obtained were used to compute percentage volume of food items in the gut (%V), percentage of ocurrence of guts having particular food item (%0) and Index of preponderance (IOP). The food of Labeo rohita consisted of plant (algae and macrophytes) and animal matter (protozoa, rotifers, cladocerans, copepods, molluscs, annelids and insects) besides unidentified matter (UM), sand/mud and detritus. Of the total 420 specimens analyzed, only 84 (20%) were found with empty guts and 336 (80%) were found with food components. Index of Preponderance (IOP) revealed that algae, along with protozoans, rotifers and cladocerans were the most preferred food items in the smaller size groups and marked a decline as the size of the fish increased. In the advanced stages, macrophytes, detritus and sand/mud were Found to form a major share of food. Subsequently rohu has been categorized as omnivore-planktophage in early stages of life and herbi-omnivore in adult stages.