Mystus Tengara Research Articles

A record of anopthalmia in Mystus tengara (Hamilton, 1822) from Assam

An abnormal case of anopthalmia in a striped catfish Mystus tengara (66.8 mm in standard length) from Assam is reported in this communication. Thirty eight morphological characters of the abnormal specimen were also studied and compared with normal specimens to observe variation in the morpho-meristic traits, if any. In the abnormal specimen, the proportionate height of the dorsal fin (31.1 mm) and nasal barbel length (75.9 mm) was found to be higher compared to that of the normal specimens (21.6 – 26.5 mm and 47.9 – 72.5 mm, respectively). While the body depth of anus was higher in case of normal specimens (19.1 – 29.2 mm) compared to abnormal specimen (14.5 mm). However, no marked variation was observed in meristic characters. This anomaly does not seem to have affected morphological aspects. Factors like weed infestation, pesticide and herbicide application adversely affecting the habitat is believed to be the cause of such deformity. The abnormality does not seem to have affected the overall growth of the fish.

Food and feeding habit of a freshwater catfish, Mystus tengara (Siluriformes: Bagridae)

Feeding is the dominant activity in entire life cycle of fish; thus detailed knowledge on food and feeding habit of any fish species is really essential to get success in culture of that particular fish species. Mystus tengara is a popular food fish due to its good taste; and recently it has also got its entry in ornamental fish markets. No such detail works till date has been performed on food and feeding habit of this fish species. So the present study has been performed to get information on the food and feeding habit of Mystus tengara. Gastro Somatic Index, Relative Length of Gut, Gut Fullness & Feeding Intensity and Gut Content Analysis have been performed as parts of the study. Results of the study have revealed that Mystus tengara is a carnivorous fish and zooplankton is the basic food group for this fish species; rotifera has also been observed as the most preferable food class. During the study, feeding activity of this fish species has never been observed to be discontinuous; though it has been observed to vary according to the breeding season; lowest feeding activity has been observed during intense breeding season while highest feeding activity has been observed during pre-spawning months.

Production of Fish Sauce from Low Cost Small Freshwater Fish and their Qualitative Evaluation

The study was conducted to produce fish sauce from small freshwater fishes like Kholisa (Colisa fasciatus), Tit punti (Puntius ticto), Jat punti (Puntius sophore), Tengra (Mystus vittatus), Taki (Channa punctatus), Gutum (Lepidocephalichthys guntea), Guchi (Macrognathus pancalus), Veda (Nandus nandus), and Bujuri (Mystus tengara) by using different concentrations of salt (25% as Treatment-I, 30% as Treatment-II and 35% as Treatment-III). Fishes were fermented for 9 months by the combined action of microorganisms and enzymes present in fish tissue and viscera in presence of salt. During fermentation the initial protein content in fish was 15.17% which were nearly digested and liquefied at the end of fermentation. Crude protein content on the basis of total nitrogen were found to be 14.58, 13.88 and 12.63% in Treatment-I, II and III respectively while the highest ash content in fish sauce was 22.97% in Treatment-III. Initial Total Volatile Base Nitrogen in fish was 1.92 mg/100g, which reached 20.88, 20.52 and 20.31 mg/100g respectively in three treatments. Initial aerobic plate count (APC) in fish was 5.99 × 106 cfu/g and after fermentation and 15 days of aging the APC in fish sauce was reduced to 1.53 × 104 cfu/ml in Treatment-I, 1.40 × 104 cfu/ml in Treatment-II and 1.27 × 104 cfu/ml in treatment-III. The major bacterial groups identified in fish sauce were Bacillus, Micrococcus, Lactobacillus and Pseudomonas. Considering the values of different parameters and result of panel test, fish sauce produced with 25% salt (Treatment-I) was found to be of best quality.DOI: http://dx.doi.org/10.3329/pa.v24i1-2.19170 Progress. Agric. 24(1&2): 171 - 180, 2013

Sensitivity evaluation in two commonly occurring freshwater fishes after intoxication with cadmium

The present observations were based on effects of cadmium on two commonly occurring freshwater fish, Channa punctatus (Bloch.) and Mystus tengara (Hamilton). The three different concentrations of cadmium chloride as 250µg/L, 500µg/L, 750µg/L and 1000µg/L, were used in the present study. After intoxication the mortality rate, respiratory stress, weight change in liver and kidney for the same were observed. The present observation reveal that as the concentrations of cadmium chloride increases the respiratory stress and mortality rate also increases, but the rate of increase of these parameters is higher in Mystus tengara than Channa punctatus. It has been noticed that as the dose of cadmium chloride increases the weight of liver and kidney in these two fish species decreases rapidly. Whereas the weight declining rate of these organs is higher in Mystus tengara than Channa punctatsus. Thus, Mystus tengara was found to be more sensitive than Channa punctatus to the cadmium.

Sensory and Microbial Quality of Retail Finfish With Emphasis on Antibiotic-Resistant Bacteria

The sensory and microbial quality of commercially important retail finfish of Kolkata, India was evaluated emphasizing oxytetracycline and chloramphenicol resistant bacterial contamination. The finfish had total viable counts (TVCs) in the range of log 4.30/g in Labeo bata to log 7.93/g in Mystus tengara. The counts of oxytetracycline and chloramphenicol resistant bacteria were in the range of log 2.00–6.79/g and log 1.70–5.80/g fish, respectively. About 72% of the Kolkata market finfish harbored viable bacteria exceeding the acceptable international limit of 5.0 × 105/g. Up to 3.45 and 29.86% of TVCs were resistant to chloramphenicol and oxytetracycline, respectively. The marine fish sold in the Kolkata market were of marginal to inferior quality with the highest mean quality index point (QIP) range of 6.80–10.20. Most freshwater fish were of fresh to marginal quality and recorded QIP in the range of 3.80–8.20. Though the freshwater fish were judged fresh by the quality index method in comparison to the marine counterparts, they recorded high viable counts. The results of the present study call for the need to educate the fish handlers on appropriate hygiene and safe handling of fish and the public about fish-borne bacterial diseases and the impact of antibiotic resistant bacteria on human health. They also show the potential for fish to be a source of antibiotic bacteria for human consumers.

Effect of Freezing Time on the Nutritional Value of Mystus gulio (Nuna tengra), Mystus tengra (Bazari tengra) and Mystus cavasius (Ghulsha tengra)

Three different species of tengra; Nuna tengra (Mystus gulio), Bazri tengra (Mystus tengara), Gholsha tengra (Mystus cavasius) were kept in freezing condition for 20 days to investigate the effect of freezing (-5°C) time on the nutrient composition (protein, lipid, moisture). The average weight of the sample was 46.5gm, 23.94gm, and 15.48gm for Nuna tengra, Gholsha tengra and Bazri tengra respectively. Samples were collected from Gollamari, Khulna. The amount of protein and lipid reduced while amount of moisture increased with prolongation of freezing time. The amount of moisture for Mystus tengara, Mystus cavasius, Mystus gulio increased from 76.12% to78.02%, 75.35% to 77.25%and 76.03% to 78.23% respectively. At fresh condition the protein content of Mystus tengara, Mystus cavasius, Mystus gulio were 16.26%, 15.52% and 14.80% and at the end of the experiment protein were 14.97%, 13.91% and 13.43%. At fresh condition the lipid content of Mystus tengara, Mystus cavasius, Mystus gulio were 6.15%, 5.98% and 6.20% and after twenty days of it’s freezing the observed lipid content were 4.9%, 5.37% and 4.86%. However, at the end of the study, no significant (p>0.5) difference was observed among different nutrient level due to increasing freezing time. DOI: http://dx.doi.org/10.3329/jsf.v8i1-2.14634 J. Sci. Foundation, 8(1&2): 119-122, June-December 2010

Redescription of the Striped Catfish Mystus tengara (Hamilton, 1822) (Siluriformes: Bagridae), India

The Bagrid Catfish Mystus tengara was described from a pond located in India under the genus Pimelodus. The validity of the fish has been confused and has frequently been treated as a synonym of Mystus vittatus. In this study, the species is rediagnosed and redescribed on the basis of fresh material collected from the Ganga-Brahmaputra drainage. M. tengara is diagnosed from congeners in having a unique combination of the following characters: body with a distinct tympanic spot and four brown stripes which are separated by a pale narrow interspace; origin of adipose-fin not reaching the base of the last dorsal-fin ray, 31-42 gill rakers on first branchial arch, eye rounded with a diameter 19.0-23.8 % HL and dorsal spine length 12.3-17.2 % SL, maxillary barbel length 254.5-360.5 % HL. A key for the identification of Mystus species from Ganga-Bramaputra drainage is also provided.

Redescription of the striped catfish Mystus carcio (Hamilton) (Siluriformes: Bagridae)

Pimelodus carcio, originally described in 1822 by Francis Hamilton, has long been treated as a junior synonym of either Mystus tengara or M. vittatus. In this paper we revalidate and redescribe the species and diagnose it from other striped Mystus by the following combination of characters: small adult size, maturing at 44.0 mm standard length; adipose-fin base shorter than or equal to dorsal-fin base; pelvic fin reaching anal-fin origin; pectoral girdle with coracoid shield exposed ventro-laterally below pectoral fin; eyes rounded and large, dorsally orientated on head; vomerine tooth-patch interrupted at midline. The species is distributed in the Ganga-Brahmaputra drainage of northeast India and Bangladesh.

Length-weight relationships of 14 Indian freshwater fish species from the Betwa (Yamuna River tributary) and Gomti (Ganga River tributary) rivers

Summary The length-weight relationships (LWRs) were studied of 588 fish covering eight families, 13 genera and 14 species (Notopterus notopterus, Gudusia chapra, Labeo calbasu, Puntius sarana, Cirrhinus mrigala, Ompok bimaculatus, Mystus tengara, Mystus cavasius, Sperata aor, Sperata seenghala, Eutropiichthys vacha, Wallago attu, Rhinomugil corsula, and Mastacembelus armatus) captured in the Betwa River (tributary of the Yamuna River) and Gomti River (tributary of the Ganga River) from December 2007 to January 2009. The b values varied between 2.4 (M. armatus) and 3.52 (P. sarana), with the mean b = 2.96 at P < 0.001 for all species. The observations are significant for conservation and management because the Betwa River has been approved under India’s first interlinking plan with the Ken River, and no length-weight data had thus far been reported for the Gomti River. The objective was to evaluate the LWRs of these two unstudied rivers for fisheries management.

A comparison of ovarian recrudescence in the catfish, Mystus tengara (Ham.), exposed to short photoperiods, to long photoperiods, and to melatonin

The present studies revealed antigonadotrophic properties of melatonin. Treatment of the catfish, Mystus tengara (Ham.), with melatonin during February and April (preparatory phase) resulted in decreased ovarian weight and arrested ovarian recrudescence. The treatment with melatonin was more effective in arresting ovarian recrudescence than exposure to short photoperiods (1 hr/day). It is suggested that melatonin secretion may be increased in the absence of light stimuli.

Morphology of ovarian changes during the reproductive cycle of the fish, Mystus tengara (Ham.).

A study has been made of the morphological and histological changes of the cat fish (Mystus tengara) ovary during its reproductive cycle in natural and confined waters. This fish is oviparous and breeds once a year during the rainy season (July throught September). Factors responsible for bringing about spawning in fishes are discussed and the onset of spawning in Mystus is attributed to monsoon rains. In the ovarian cycle 7 phases have been recognised, whic are based on the gross morphological changes in the ovary, the percentage and duration of different developmental stages of oocytes, the average diameter and the gonosmatic index. They are: 1) immature virgin (November-February); 2) preparatory virgin (March-April); 3) maturing virgin (April-May); 4) pre-spawning virgin (June); 5) spawning (July-August); 6) depletion (September), and 7) recoupment (October-November). Oocyte growth has been divided into 9 stages. The ova diameter and gonosomatic index are maximum in July and minimum in November and December.

Present Fisheries Status of Sariakandi Fish Pass, Sariakandi, Bogra

J. bio-sci. 14: 133, 2006

Seminal vesicles and sperm duct of an Indian catfish, Mystus tengara (Ham.), with particular reference to their seasonal cycle.

Seminal vesicles and sperm duct of an Indian catfish, Mystus tengara (Ham.), with particular reference to their seasonal cycle.

The Occurrence and Significance of Follicular Atresia in the Catfish, Mystus tengara (Ham.) (Teleostei)

The Occurrence and Significance of Follicular Atresia in the Catfish, <i>Mystus tengara</i> (Ham.) (Teleostei)