Resources

Description

A feeding demonstration trial was conducted at the Jiaguanghu Fish Farm in Huainan City, Anhui Province, to demonstrate fingerling to market growth performance of channel catfish using the ASA 80:20 pond production model and soy-based feed. This was the second year of a two-year trial at the Jiaguanghu farm that began in 2000 with a catfish fry to fingerling pond trial. In the 2001 trial, catfish fingerlings were stocked in three ponds of size 3.0-mu each at a density of 600 channel catfish and 100 silver carp fingerlings per mu. Catfish were fed a 32/6 extruded, floating pellet feed formulated as an all-plant protein ration, with soybean meal as the primary protein source. Channel catfish grew from 59 g to an average weight of 672 g per fish in 156 days of feeding. Gross production of channel catfish and silver carp averaged 402 kg/mu and 77 kg/mu, respectively. Average survival rates for channel catfish and silver carp were 99.7% and 98.5%. Channel catfish FCR with the soymeal-based feeds averaged 1.44:1. Average net economic return was RMB 1,633/mu. Return on investment (ROI) averaged 35.5%. The ASA 80:20 technology and extruded, soy-based feeds simplified production management and yielded better fish performance and improved water quality, and required less labor, than the farm’s traditional practices. Harvested catfish were of uniform size, and had good body shape and minimal fat deposition. No off-flavor was experienced in fish from the three trial ponds. Local farmers visited throughout the trial to monitor progress and expressed interest in adopting the technology and feed based on their observations of catfish performance.

Language
English

Date Published
October 31, 2001

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

A feeding trial was conducted at the Xu Xing Zhuang Fish Culture Farm in Beijing to demonstrate fry to fingerling growth performance of longnose catfish (Leiocassis longirostris) using the ASA 80:20 pond production model and soymeal-based fry and fingerling feeds. Fish were stocked in three ponds of size 5.0-mu each at a density of 5,000 longnose catfish and 1,000 silver carp fry per mu. Catfish were fed a combination of soymeal-based 41/11 fry and 36/7 fingerling feeds. Longnose catfish grew from 0.8 g to an average weight of 45 g per fish in 110 days of feeding. Gross production averaged 186 kg/mu for longnose catfish and 70 kg/mu for silver carp. Average survival rates for longnose catfish and silver carp were 83% and 100%, respectively. Longnose catfish fed the combination of ASA soy-based feeds yielded an average FCR of 1.18:1. Average net economic return was RMB 1,921 per mu. Return on investment (ROI) averaged 33.6%. Longnose catfish exhibited good growth performance, FCR, survival and economic return in this trial, and are a promising pond culture species in feed-based production systems for the China freshwater aquaculture industry.

Language
English

Date Published
October 31, 2001

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

A feeding trial was conducted at the Harbin West Suburb Fish Farm in Heilongjiang Province to demonstrate the fingerling to market growth performance of bigmouth buffalo fish using the ASA 80:20 pond production model and a soymeal-based growout feed. Fish were stocked in two, 7-mu ponds at densities of 800 bigmouth buffalo and 100 silver carp fingerlings per mu. Bigmouth buffalo grew from 60 g to an average weight of 464 g per fish in 120 days of feeding. Gross production averaged 337 kg/mu for bigmouth buffalo and 82 kg/mu for silver carp. Average survival rates for bigmouth buffalo and silver carp were 90.7% and 93.5%, respectively. Bigmouth buffalo FCR with the all-plant protein, soymeal-based feed was 0.99:1. Average net economic return was RMB 2,514/mu per mu at market prices of RMB 16.2/kg for bigmouth buffalo and RMB 2.4/kg for silver carp. Average ROI per mu was 80.2%. Results of the feeding demonstration showed that bigmouth buffalo fed well on the extruded, floating feed, and exhibited good growth performance, FCR, survival and economic return with the ASA soymeal-based feed and 80:20 production technology. Bigmouth buffalo appeared to have been underfed in the trial, and it is recommended to increase the feeding rate if larger fish are required for the market.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

A feeding demonstration trial was conducted at the Jiao Gang Hu Fish Farm in Huainan, Anhui Province, to demonstrate fry to fingerling growth performance of channel catfish using the ASA 80:20 pond production model and soymeal-based fry and fingerling feeds. Fish were stocked in three, 3-mu ponds at a densities of 8,000 channel catfish fry and 1,000 silver carp fry per mu. Channel catfish grew from 1.6 g to an average of 49.3 g per fish in 101 days of feeding. Gross production averaged 353.5 kg/mu for channel catfish and 50.1 kg/mu for silver carp. Average survival rates for channel catfish and silver carp were 89.4% and 81.5%, respectively. Channel catfish FCR for the combination of ASA 41/11 fry and 36/7 fingerling feeds was 0.93:1. Average net economic return was RMB 5,665/mu per mu, and average ROI was 110.7%. Channel catfish exhibited good growth, feed conversion, survival and economic return with the ASA 80:20 pond technology and soymeal-based feeds. Compared to normal production of channel catfish at the Jiao Gang Hu Fish Farm, fish survival was reported to have increased by 25-30%, FCR was reduced by 100%, and ROI was increased by >60% with the ASA technologies and feeds.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Crucian carp fingerlings were grown to market size in ponds in Chengdu using the ASA 80:20 production model and a combination of local and ASA soymeal-based growout feeds. Fish were stocked in three ponds of approximately 3-mu each at 2,000 crucian carp per mu together with 150 silver carp fingerlings per mu. Crucian carp were stocked at size 20 g and grew to an average weight of 214 g per fish in 164 days of feeding. Gross production averaged 406 kg/mu for crucian carp and 137 kg/mu for silver carp. Net production for crucian carp averaged 366 kg/mu for the 9.9 mu of trial ponds. Average crucian carp survival was 95%. FCR for the combination of local and ASA feeds was 1.63:1. Net economic return was RMB 645 per mu. ROI ranged from 10% to 30.4% for thethree trial ponds. The average ROI for the three ponds was 21.2%. Low economic return in one of the ponds was the result of a silver carp fish kill in mid-August. Results of the feeding demonstration showed that crucian carp reached the target market size 15 days ahead of schedule using the ASA technology and feed.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Fry to fingerling growth performance of Beijing and Suzhou strains of crucian carp were compared in a 4-month feeding trial at the Beijing Xu Xing Zhang Fish Culture Farm. Crucian carp were grown in ponds using the ASA 80:20 production model and soymeal-based 41/11 fry and 36/7 fingerling feeds. Fish stocking density was 5,000 crucian carp fry and 1,000 silver carp fry per mu. Each fish strain was replicated in three ponds. The local Beijing strain of crucian carp grew from 0.6 g to 55 g in 122 days of feeding. Suzhou strain crucian carp imported from a fish farm in Suzhou, Jiangsu Province, grew from 0.6 g to 60 g in the same period. Growth of the Suzhou strain crucian carp was significantly better (P<0.05) than the local Beijing strain. FCR was 1.42:1 for the Beijing strain and 1.34:1 for the Suzhou strain, and was also significantly different (P<0.05). Net income was 15.4% higher and ROI 13.2% higher for the Suzhou strain crucian carp. Results of the trial indicate that the Beijing farm should upgrade its crucian carp breeding stock to a superior strain.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

A feeding trial was conducted at the Jin Shan Bao Fish Farm in Harbin, Heilongjiang Province, to demonstrate the fingerling to market growth performance of grass carp using the ASA 80:20 pond production model and a soymeal-based growout feed in northeastern China. Harbin is located at 46o north latitude. Fish were stocked in two ponds of approximately 5-mu size at densities of 600 grass carp and 100 silver carp fingerlings per mu. Grass carp grew from 60 g to an average weight of 777 g per fish in 138 days of feeding. Gross production averaged 424 kg/mu for grass carp and 87 kg/mu for silver carp. Average survival rates for grass carp and silver carp were 91% and 98%, respectively. Grass carp FCR with the all-plant protein, soymeal-based feed was 1.54:1. Average net economic return was RMB 896 per mu, for an average return on investment of 36.8%. Results of the feeding demonstration showed that grass carp fed well on the extruded, floating feed, and exhibited good growth performance, FCR, survival and economic return with the ASA soymeal-based feed and 80:20 production technology.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Grass carp growth performance in ponds was compared with two isonitrogenous feeds with different energy and fiber levels. One feed was the standard ASA/China 32/6 freshwater carp growout feed. This feed was formulated to contain 32% crude protein, 6% fat and 2.7% fiber, with dehulled soybean meal as the primary protein source. The second feed was a new ASA 32/3 grass carp growout feed formulated to contain 32% crude protein, 3% fat and 8% fiber, with standard soybean meal as the primary protein source and soy hulls as the fiber source. Both feeds were fed in extruded, floating pellet form to grass carp in a 6-month pond trial at the Xu Xing Zhuang Fish Culture Farm in Beijing. Grass carp fed the ASA 32/6 carp growout feed grew from 100 g to 825 g in 174 days with an FCR of 1.23:1. Grass carp fed the ASA 32/3 grass carp feed grew from 100 g to 815 g in 174 days with an FCR of 1.27:1. Fish growth was significantly different with the two feeds (P<0.05), but there was no significant difference in FCR (P>0.05). Gross production with the 32/6 carp growout feed was 513.7 kg/mu (7,706 kg/ha) for grass carp and 136.1 kg/mu (2,042 kg/ha) for silver carp. Gross production with the 32/3 grass carp feed was 502.3 kg/mu (7,535 kg/ha) for grass carp and 139.0 kg/mu (2,085 kg/ha) for silver carp. The ratio of fed grass carp to filter feeding silver carp was 79/21 and 78/22 for the 32/6 and 32/3 feeds, respectively. Net income per mu was RMB 871 for the 32/6 feed and RMB 1,068 for the 32/3 feed. Return on investment (ROI) was 23.9% with the 32/6 feed and 31.7% with the 32/3 feed. Net income per mu was 22.6% higher and ROI 32.6% higher with the low-fat, high- fiber 32/3 grass carp feed than with the 32/6 carp growout feed because of the significantly lower cost of the 32/3 feed.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Japanese sea bass (Lateolabrax japonicus) growth in cages was evaluated from small fingerling to market size during the 1999 and 2000 production seasons at Nan Ji Island along the east coast of China. Growth from fingerling to sub-market size was evaluated in 1999 with soymeal-based and fishmeal-based feed rations formulated to contain 43% protein and 12% fat, and from sub-market to market size in 2000 with the 43/12 soymeal-based feed ration. The soymeal- and fishmeal-based rations were formulated to be isonitrogenous and isocaloric and were fed in an extruded pellet form. In June 1999, fish were stocked in 8.0-m3 cages at 350 fish per m3 and fed for 153 days. Sea bass grew from 3 g to 297g with the soymeal-based ration, and from 3 g to 289 g with the fishmeal-based ration. There was no significant difference (P>0.05) in fish growth or feed conversion efficiency with the two feeds. FCR averaged 1.53:1 and 1.55:1 for the soymeal- and fishmeal-based rations, respectively. Survival averaged 50% for all cages and treatments. The sea bass were over-wintered and restocked in 8.0-m3 cages at 175 fish per m3 in late April 2000. Sea bass grew from 302 g to 527 g in 90 days on the soymeal-based ration, with an average FCR of 1.54:1. Fish survival averaged 93%. Gross fish production averaged 85.9 kg/m3. Net profit was RMB 28,559 for the three trial cages, or RMB 1,190/m3, at an August 2000 market price of RMB 36/kg.

Language
English

Date Published
October 24, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Japanese sea bass (Lateolabrax japonicus) growth in cages was evaluated from fingerling to sub-market size with extruded pellet and fresh fish rations in an ASA feeding trial at Xiangshan, Ningbo along the coast of Zhejiang Province, China. The extruded feed was a soymeal-based ration containing 43% crude protein and 12% fat and fed in extruded, floating pellet form. Fresh fish was fed in chopped form. Sea bass fingerlings were stocked in 8.0-m3 cages at 200 fish per m3. Sea bass grew from 10.6 g to 178.3 g in 102 days on the ASA extruded feed, with an FRC of 1.82:1, and from 11.0 g to 178.3 g in 102 days on the fresh fish ration, with an FCR of 6.78:1. Gross production averaged 31 kg/m3 with the extruded feed and 29.6 kg/m3 with the fresh fish ration. Net income and ROI were RMB 478/m3 and 62.7%, respectively, for sea bass fed the extruded ASA feed, and RMB 341/m3 and 40.4% for sea bass fed the fresh fish diet. Feed cost per kilogram of fish growth was RMB 9.46 with the ASA feed and RMB 14.92 with the fresh fish diet. Results demonstrated a 40% higher net income, 55% higher ROI, and 37% lower feed cost with the soymeal-based extruded feed than with a traditional fresh fish diet. The added benefits of quality consistency, less nutrient loading of the aquatic environment, ease in shipping and storing, and absence of potential pathogens make manufactured feed a better choice than fresh fish for feeding Japanese sea bass.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Growth performance of normally pigmented and albino channel catfish was compared in cages at Min Qing Reservoir in Fujian Province. Catfish were cultured in floating cages using the ASA LVHD cage technology model and a soymeal-based, 32% protein floating feed. Normally pigmented and albino channel catfish were stocked in six, 1-m3 cages at a density of 400 fish/m3. Each treatment was replicated in three cages. Normally pigmented channel catfish grew from 83 g to 494 g in 142 days of feeding. Albino catfish grew from 83 g to 392 g in the same period. FCR was 1.56:1 for the normal catfish and 1.67:1 for the albino catfish. Gross production and survival averaged 193.8 kg/m3 and 90.4% for the normal catfish, and 148.8 kg/ m3 and 91.5% for the albino catfish. Fish growth, survival and production per m3 were significantly higher (P<0.05) for the normally pigmented catfish group, but there was no significant difference in FCR (P>0.05) for the two groups. Average net economic return and ROI for the normal catfish were RMB 1,384/m3 and 72.4%, respectively. Average net economic return and ROI for the albino catfish were RMB 1,309/m3 and 70.8%. Net return and ROI were significantly different (P<0.05). Normally pigmented catfish yielded a higher net return and ROI than albino catfish, despite albino catfish having a 29% higher market value. Results of this trial were opposite of U.S. studies that found no production differences between normally pigmented and albino channel catfish, and indicate there is probably significant inbreeding in the albino catfish stock tested in this trial.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Sub-market size yellow croaker (Pseudosciaena crocea) were weaned from a fresh fish diet to an extruded pellet feed and grown to market size in cages in ASA feeding trials at Nanji Island, Wenzhou, and Xiangshan, Ningbo. The extruded feed was a soymeal-based ration containing 43% crude protein and 12% fat and fed in extruded, floating pellet form. Yellow croaker were stocked in 22.5-m3 cages at 31 fish per m3 in the Wenzhou trial, and at 75 fish per m3 in 8-m3 cages in the Ningbo trial. In the Wenzhou trial, yellow croaker grew from 164 g to 327 g in 123 days on the extruded feed, with an FRC of 1.67:1 and 96.7% survival. Net income for the Wenzhou trial was RMB 7,043 per cage, or RMB 313/m3 for the 22.5-m3 cages. ROI was 83.2%. In the Ningbo trial, yellow croaker grew from 103 g to 248g in 118 days on the extruded feed, with an FRC of 2.24:1 and 93.3% survival. Net income for the Ningbo trial was RMB 3,480 per cage, or RMB 435/m3 for the 8-m3 cages. ROI was 72%. Fish growth and FCR in the Ningbo trial were affected by a parasitic infestation midway through the trial. Both trials demonstrated good croaker growth performance and economic return with the soymeal-based, extruded feed. High net income and ROI demonstrated the feasibility of weaning sub-market size yellow croaker from fresh fish to an extruded feed and growing them to market size on the extruded feed. The added benefits of quality consistency, less nutrient loading of the aquatic environment, ease in shipping and storing, and absence of potential pathogens make extruded feed a superior choice than fresh fish for feeding yellow croaker in cages.

Language
English

Date Published
October 31, 2000

Author
United States Soybean Export Council
Description

Yellow croaker (Pseudosciaena crocea) growth in cages was evaluated from fingerling to sub-market size with extruded pellet and fresh fish rations in ASA feeding trials at Xiangshan, Ningbo and Nanji Island, Wenzhou. The extruded feed was a soymeal-based ration containing 43% crude protein and 12% fat and was fed in extruded, floating pellet form. Fresh fish was fed in chopped form. Yellow croaker fingerlings were stocked in 8.0-m3 cages at 200 fish per m3 in the Ningbo trial and 175 fish per m3 in the Wenzhou trial. In the Ningbo trial, yellow croaker grew from 3.2 g to 37.9 g in 103 days on the extruded feed, with an FRC of 1.69:1, and from 3.4 g to 44.0 g in 103 days on the fresh fish ration, with an FCR of 9.92:1. Net income and ROI were 27% and 82% higher, respectively, for fish fed the extruded feed than for fish fed the fresh fish ration in the Ningbo trial. In the Wenzhou trial, yellow croaker grew from 5.4 g to 23.4 g in 62 days on the extruded feed, with an FCR of 1.53:1, and from 5.6 g to 25.4 g in 62 days on the fresh fish ration, with an FCR of 4.98:1. Net income and ROI in the Wenzhou trial were nearly identical for the two feed treatments, but any increase in the cost of fresh fish above the RMB 1.0/kg rate that prevailed during the trial would favor the use of the extruded feed. Results of both trials demonstrated good growth performance, feed conversion and economic return with the soymeal-based extruded feed and ASA cage technology. The added benefits of quality consistency, less nutrient loading of the aquatic environment, ease in shipping and storing, and absence of potential pathogens make manufactured feed a better choice than fresh fish for feeding yellow croaker.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Red drum growth from advanced fry to 3-g fingerlings was compared using wild caught fresh fish and manufactured feed rations. Wild caught fresh fish was fed in a ground, paste form. Manufactured feeds were fed as No. 3 (1.1-1.5 mm) crumbles and 1.5-mm extruded pellets. Red drum fry were stocked in 2.25-m3 cages at a density of 2,500 fish per cage at 36 days post swim-up. Red drum fry grew from an average weight of 0.21 g to 3.24 g and 3.42 g, respectively, on the manufactured feeds and fresh fish paste in 24 days. Feed conversion ratios for the manufactured feeds and fresh fish paste were 1.43:1 and 5.17:1, respectively. Fish survival was 91.5% for fish fed the manufactured feeds, and 81.0% for fish fed the fresh fish paste. While growth was 5% better with the fresh fish paste, higher fish survival and better feed conversion with the manufactured feeds resulted in higher fish production and greater economic return. Results indicate that manufactured feeds can effectively replace fresh fish as the starter food for advanced red drum fry in cages.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

The American Soybean Association (ASA), in cooperation with the China National Fisheries Extension Center (NEC) and the Guangxi Provincial Fisheries Extension Station, conducted cage feeding trials with red drum (Sciaenops ocellata), Japanese sea bass (Lateolabrax japonicus), and blackfin sea bream (Acanthopagrus sp.) at Longmen Town, Qingzhou City, Beihai in 2000. The objective of the trials was to demonstrate that sub-market size fish of each of the three test species could be weaned from a fresh fish diet to a soymeal-based, extruded feed and economically grown to market size on the extruded feed.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

The American Soybean Association (ASA), in cooperation with the China National Fisheries Extension Center (NEC), the Guangdong Provincial Fisheries Extension Center, and the Long Gang Fisheries Research Institute coastal cage culture farm in Dong Shan Bay, conducted feeding trials with green grouper (Epinephelus awoara), red drum (Sciaenops ocellata) and pompano (Trachinotus ovatus) in 2000. The objective of the green grouper and pompano trials was to compare growth and economic performance of these species from fingerling to market size with a traditional fresh fish diet and a soymeal-based, extruded aquafeed. The objective of the red drum trial was to demonstrate that sub-market size red drum could be weaned from fresh fish to a soymeal-based manufactured feed and economically grown to market size on the manufactured feed.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

A feeding trial was conducted at the Tai Xing Fish Stock Farm in Tai Xing, Jiangsu Province, to demonstrate the fry to fingerling growth performance of wuchang bream using the ASA 80:20 production model and ASA soymeal-based fry and fingerling feeds. Fish were stocked in three, 2.0- mu ponds at densities of 5,000 wuchang bream and 800 silver carp fry per mu. Wuchang bream grew from 0.2 g to an average weight of 43.8 g per fish in 117 days of feeding. Gross production averaged 189.1 kg/mu for wuchang bream and 60.5 kg/mu for silver carp. Average survival rates for wuchang bream and silver carp were 86.4% and 96.4%, respectively. Wuchang bream FCR for the combination of ASA fry and fingerling feeds was 1.36:1. Net economic return for the three trial ponds averaged RMB 392.61/mu per mu. ROI averaged 18%. Results of the feeding demonstration showed that wuchang bream fed well on extruded, floating feed, and exhibited good growth performance, FCR, survival and economic return with the ASA soymeal-based feeds and 80:20 production technology.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Yellow croaker growth from the advanced fry to fingerling stages was compared using fresh fish and manufactured feed rations. Fresh fish was fed in a ground, paste form. A manufactured starter feed was fed in No. 2 crumble form. Croaker fry were cultured in 2.25-m3 cages at a density of 2,500 fish per cage. Yellow croaker fry grew from an average weight of 0.67 g to 3.4 g and 3.2 g, respectively, on the fresh fish paste and manufactured feed in 45 days. Croaker had difficulty ingesting the crumble feed because of the small particle size. Observations suggest an optimal feeding regime of two weeks on crumble feeds, followed by extruded pellets beginning at fish size 0.7 g.

Language
English

Date Published
October 31, 2000

Author
Michael C. Cremer, Zhang Jian and Zhou Enhua
Description

Channel catfish (Ictalurus punctatus) growth in 1-m3 cages was evaluated with three extruded feed rations with varying soybean meal and fishmeal inclusion rates. One ration was formulated as an all- plant protein diet with dehulled soybean meal as the primary protein source. The second ration was formulated with dehulled soybean meal as the primary protein source, but with 5% fishmeal. The third ration was formulated with fishmeal as the primary protein source. All three rations were designed to be nutritionally the same, with 32% protein and 6% fat. Channel catfish stocked at 400 fish per m3 grew from 69g to 467 g, 500 g and 532 g, respectively, on the all-plant protein soy-based, soy-based with 5% fishmeal, and fishmeal-based rations. Growth was significantly different (P<0.05) among the three rations. FCR for the soy-based, soy-based with 5% fishmeal, and fishmeal-based rations was 1.45:1, 1.34:1 and 1.25:1, respectively. Net production for the soy-based, soy-based with 5% fishmeal, and fishmeal-based rations averaged 157 kg/m3, 171 kg/m3 and 183kg/m3, respectively. Survival averaged 99% for all feed treatments. Net economic return at the prevailing market price of RMB 21/kg was RMB 2147/m3, RMB 2373/m3 and RMB 2570/m3, respectively, for the all-plant protein soy-based, soy-based with 5% fishmeal, and fishmeal-based feed rations. Return to investment averaged 124%, 134% and 139% for the soy-based, soy-based with 5% fishmeal, and fishmeal-based ration treatments, respectively. Net economic return and return to investment were significantly different (P<0.05) among the three feed treatments.

Language
English

Date Published
October 31, 1999

Author
Michael C. Cremer and Zhang Jian
Description

Three fingerling sizes of crucian carp were grown to market size in ponds using the ASA 80:20 production model and a soy-based diet. Fish were Fengzhen crucian x Xingguo red common carp bred in 1998 at the Tai Xing Fish Stock Farm in Jiangsu Province. Fish were stocked at 1000 crucian carp per mu together with 60 silver carp per mu. Fingerlings of sizes 63 g and 44 g grew respectively to 411 g and 383 g in 212 days of feeding. Fingerlings of size 32 g grew to 363 g in 214 days of feeding. The 63-g fingerlings reached a market size of 250 g in 150 days, while the 44-g and 32-g fish reached 250 g in 158 and 165 days, respectively. Stocking fingerlings of different sizes may be a good management strategy for fish farmers interested in extending the marketing season for crucian carp. Feeding for 212 to and 214 days yielded 363-g to 411-g fish having high market value because of their large size. FCR with the ASA all-plant protein, soy-based diet averaged 1.50 to 1.61. Use of this diet in the extruded, floating form allowed the Tai Xing farm manager to closely monitor fish feeding performance and fish health and prevented over-feeding of fish and wasting of feed.

Language
English

Date Published
October 31, 1999

Author
Michael C. Cremer and Zhang Jian