An export oriented marine value chain for farmed seafood production using cobia (Rachycentron canadum) through rural entrepreneurship
This project contributed in the introduction of new marine species Cobia in Indian aquaculture. Four technologies viz., pond culture of cobia, cage culture of cobia, cobia broodstock feed and value added cobia products were developed and approved by NAIP and published in the Compendium released by NAIP.
Technology on Pond grow out culture of cobia was developed for the first time in India by Fisheries College and Research Institute, Thoothukudi with the production of 1kg/sq.m at the stocking density of 1 fish/4 m2 with an average weight of 4 kg in a period of ten months.
Technology on Cage grow out culture of cobia was developed using formulated feed at a stocking density of 4 fish/m3 with the production of 8 kg per m3 with an average weight of 4.5 kg in a period ten months.
First phase of grow out culture of cobia in concrete tanks at 20 per m3(10 g size) attained average weight of 40 g in one month and 150 g in three months. The 40 g size grown cobia juveniles were found to be suitable for cage culture and 150 g found to be suitable for pond grow out culture for achieving 100% survival.
Cobia broodstock feed was developed. Wet feed containing either cuttle fish (5 days) or sardines(2 days) + Ash Gourd (40 mg/kg feed) + Agar agar (20 mg/kg feed) fed ad libitum to cobia of 3 to 4 kg attained 12 – 13 kg in a period of 6 months in 6 m dia HDPE Cage. Ova measured 800 – 900 micron in female brood stock and condensed milt in male cobia brood stock were observed during cannulation.
Five ready to eat cobia fish products viz., canned cobia, sous vide cook chilled cobia fish curry, hot filled chilled cobia fish curry, cobia in retort pouches and cobia pickle; four ready to cook products viz., fresh and frozen cobia, vacuum and modified atmospheric packaged products, cobia Macroni and cobia noodles were developed. Two byproducts viz., collagen and leather were developed from cobia fish waste.
Memorandum of Understanding (MoUs) were signed between TNFU, Nagapattinam and three entrepreneurs viz., Mr.Patnadkar of Ankola, Karnataka State and Mr.Rajkumar of N.N.Chavadi, Nagapattinam district on pond culture of cobia and Mr. Gunasekaran of Kuttiyandiyur, Nagapattinam District on Cobia value added products.
Influence of health promoting additives on the growth, gonad development and disease resistance of goldfish, Carassius auratus (Linnaeus, 1758)
Three health promoting additives (mannan oligosaccharides, nucleotides and beta carotenoids)
have shown improvement in growth, gonad development and disease resistance of goldfish Carassius auratus when compared to control.
Among all the three additives, the beta carotenoids at 300ppm (0.03%) showed the highest value in the growth (mean weight gain - 3.072 g, mean weight gain per day- 0.0545g, specific growth rate - 0.698g), gonad development (gonado somatic index- male 3.487g and female 4.035g) and the disease resistance of goldfish against Aeromonas hydrophila was higher with the survival rate of 95%.
Experimental Gold Fish
Beta Carotenoids Incorporated Feed
Establishment of ‘Biosecured Ornamental Fish Brood Bank’
at Madhavaram, Chennai
Biosecured ornamental fish brood bank’ was established at Madhavaram Campus of Tamilnadu Fisheries University. Quality brood stocks were developed for economically viable ornamental fishes like Danio devario, Puntius gelius, Puntius phutunio, Barilius barila, Badis badis, Colisa lalia , Colisa sota and Colisa fasciatus to popularize the native varieties of fishes.
Innovative culture practices in ornamental fish rearing were demonstrated using biosecured raceway system, biofloc based liner ponds and FRP cages as pond-in-pond systems. Quality ornamental fish brooders and seeds having good colour, finnage and health are being supplied to the farmers at subsidized rates.
Beta Carotenoids Incorporated Feed
Beta Carotenoids Incorporated Feed
Role of supplemented energy sources on spermatological parameters of selected cultivable carps
Egg yolk at 5, 10 and 15% and glucose at < 1% were supporting the motility duration of the spermatozoa of common carp and mrigal. The initial mean motility duration of carpio was 265.66± 4.5s and that of C. mrigala was 230.66± 7.5s. At the end of 42nd day of cryopreservation, the mean motility duration of C. carpio spermatozoa cryopreserved with glucose at 0.25% and egg yolk at 5% resulted in mean motility duration of 110.33±3s and 149±2.6s, respectively (P>0.05). The spermatozoa of C. mrigala cryopreserved with glucose at 0.5% and egg yolk at 10% resulted in the highest mean motility duration of 204±3.6s and 145±4s, respectively (P>0.025).
The highest percentage of live cells could be noticed only with glucose at 0.25% and egg yolk at 5% for carpio spermatozoa. The highest mean percentages of live cells were 71% and 78%, respectively for the above two energy sources.
Therefore, glucose and egg yolk served as energy supporters that have led to higher mean motility duration and higher percentage of live cells for Cyprinus carpio and Cirrhinus mrigala.