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ANNEXES

ANNEX 1

PROJECTED AQUACULTURE PRODUCTION BY 1982 IN THE REVISED NATIONAL AQUACULTURE DEVELOPMENT PLAN

(in tons)

A.Marine and Brackish Waters
 1.Mariculture Remarks
  Abalone500  
  Lobster800 (Semi-culture)
  Mussel170 000  
  Clams14 020185 320 
 2.Coastal Lagoons 
  Oyster210 000  
  Shrimp26 548 (Through habitat improvement and culture)
  Finfish5 000 (Culture)
  Finfish120 000 (Through habitat improvement and culture in fish pens, ponds, etc.)
  Turtles3 305  
  Others8 827371 680(Crabs and algae)
B.Inland Waters
  Medium-and large-sized reservoirs60 000 (Tilapia, carps, native cichlids, catfish, black bass and atherinids)
  Lakes and dams35 000 (1–10 ha: total 15 000 ha; 11–100 ha: total 30 000 ha; tilapia, carps, native cichlids and catfish
  Fish farms11 000106 000(Intensive culture of catfish, Machrobrachium, trout and white fish)
  TOTAL 663 000 

ANNEX 2

ITINERARY OF ECONOMIST AND MISSION LEADER

      Date          Locality                    Purpose of Visit
14 May 1978Arrival in Mexico City 
15Mexico CityConsultation with authorities and counterparts
16–17Mazatlán, San Blas, La PazAerial reconnaissance of potential areas for aquaculture with the World Bank group
18–21Mexico CityConsultation and data collection
22–23Tampico, TamaulipasVisit Laguna de San Andrés
24–26Tuxpan, VeracruzVisit Laguna de Tamiahua
27 May–7 JuneMexico CityInterim discussions and data collection: visit Central Market
8–11 JuneSan BlasVisit coastal areas of Nayarit
12–13Mazatlán, SinaloaVisit Laguna de Huizache-Caimanero and Macrobrachium hatchery in Chametla
14–15Ensenada, Baja CaliforniaReview abalone and oyster culture
16–19Mexico CityInterim discussions
20–22VeracruzVisit Macrobrachium hatchery in Catemaco and tilapia hatchery in Temazcal
23Mexico City 
24–28OaxacaVisit coastal area in Tehuantepec
29 June–16 JulyMexico CityPreparation of final report

ANNEX 3

ITINERARY OF AQUACULTURIST (MOLLUSCS)

      Date        Locality                    Purpose of Visit
13 May 1978Arrival in Mexico City 
15–16Mexico CityConsultations with authorities and counterparts
17–18Villahermosa, TabascoVisit local fishery authorities in Tabasco and aerial survey of the Carmen-Machona and Mecoacan lagoon areas
18Puerto CeibaVisit Aquaculture Centre and oyster parks
19VillahermosaConsultation and data collection
20–21Mexico CityInterim discussions with counterparts
22Tampico, TamaulipasAerial survey of Laguna San Andrés and Laguna Madre
23TampicoVisit by boat Laguna del Pueblo Viejo to observe oyster spat collectors
24–26Tuxpan, VeracruzVisit by boat Laguna de Tamiahua and Río Tuxpan creek; contact centre's staff and collect information
27 May–7 JuneMexico CityInterim discussion with counterparts; visit to Mercado de la Viga
8Tepic, NayaritVisit local fishery authorities and fish culture station and hatchery in San Cayetano
9–11San Blas, NayaritVisit oyster culture parks in San Blas and Camichin, and the hatchery under construction; aerial survey from San Blas to Laguna de Agua Brava
12Mazatlán and Rosario, SinaloaVisit the Macrobrachium and shrimp farm at Chametla, the Caimanero-Huizache lagoons, and observe experimental oyster culture work in Teacapán creek
14–18Tijuana, Baja California and San Diego, U.S.A.Visit various oyster hatcheries (Pacific Mariculture, Granite Canyon Laboratory and Pigeon Point Oyster Hatchery) at Moss Landings and data collection on oyster and other species
19–21 JuneEnsenada, Baja CaliforniaVisit the oyster culture ponds and new oyster hatchery in San Quintín and Erendira, where mussel seed is extracted. Observe the experimental oyster and mussel culture work in Bahía de los Angeles
22–27 JuneLa Paz, Baja CaliforniaVisit the culture site for scallop (Aeguipecten circularis) and other commercial important lamellibranch species in Bahía de la Paz, and the experimental mussel cultivation in Bahía Magdalena
28 June–16 JulyMexico CityPreparation of final report

ANNEX 4

ITINERARY OF AQUACULTURIST (BRACKISHWATER FISH FARMING)

      Date        Locality                    Purpose of Visit
22 May 1978Arrival in Mexico City 
23 Consultations with authorities and counterparts
24–25Paraíso and Sánchez Magallanes, TabascoReconnaissance of Laguna del Carmen, La Palma, Machona, Redonda y Tupilco (by boat)
26Puerto Ceiba, Paraíso, TabascoConsultation with technical personnel of Tampico Centre for tropical aquaculture; reconnaissance of Laguna Mecoacán (by boat)
27–28Villahermosa, TabascoAerial survey of Laguna del Carmen, La Palma, Machona, Redonda, Tupilco and Mecoacán; meeting with technical personnel of State Fisheries Office
29 May–1 JuneMexico CityMeeting and group discussion with mission members
2Tampico, Valle Hermoso and Matamoros, TamaulipasAerial reconnaissance of Laguna San Andrés, Laguna de Catan and Laguna Madre: conference with technical personnel of the Aquaculture Centre of Valle Hermoso
3Laguna Madre, La Pesca and Tampico, TamaulipasObserve shrimp traps, activities related to monitoring of physico-chemical parameters of Laguna Madre and infrastructures at La Pesca
4Laguna San Andrés and Tancol, TamaulipasAppraise possible areas for fish culture along the mouth of Rio El Tigre; visit freshwater fish hatchery, Tancol.
5Tampico, TamaulipasConsultation with the State Fishery authorities and technical personnel of the Tampico Aquaculture Centre
6 JuneTuxpan, VeracruzReconnaissance (by boat) of certain portions of Lake Tampamachoco, and discussion with technical personnel of the Tuxpan Aquaculture Centre
7Mexico City 
8–11 JuneTepic, San Blas and Camichín, NayaritCourtesy call on State Fishery authorities of Nayarit, aerial reconnaissance of Laguna Agua Brava, inspection of facilities and consultation with technical personnel of the Aquaculture Centre of San Blas, inspection of probable sites for brackishwater ponds along tidal rivers
12–13Rosario, ChametlaSee Laguna del Caimanero and Marisma Huizache; observe shrimp farm under construction and progress of oyster investigations in the Teacapan River
14–16Culiacán, SinaloaConsultation with technical personnel of the Aquaculture Centre of Coyuca; visit mullet nursery ponds; reconnaissance of Coyuca, Nuxco and Chautengo Lagoons
24–27Tehuantepec, OaxacaInvestigate availability of milkfish fry near mouth of Laguna Superior and Inferior, visit fish pens and ponds of the Aquaculture Centre of Tehuantepec; visit Aquaculture Centre's projects on shrimp culture in small lagoons in Laguna Mar Muerto; survey for milkfish fry in Aquachil
28TehuantepecDiscussions with technical personnel of Aquaculture Centre
29–30Tonala, ChiapasReconnaissance of La Joya and Mar Muerto Lagoons
1–16 JulyMexico CityPreparation of final report

ANNEX 5

ITINERARY OF AQUACULTURIST (FRESHWATER FISHFARMING)

      Date        Locality                    Purpose of Visit
30 May 1978Arrival in Mexico City 
31Mexico CityConsultations with counterparts
1 JuneEl Rodeo, MorelosVisit existing hatcheries and nearby lagoon
2–6Mexico CityConsultation with authorities and counterparts
7–8Infiernillo Dam and Zacapu, MichoacánIdentify potential sites for white fish farm and pilot plant
9–11Tizapan, JaliscoIdentify sites for fish farm and hatcheries
12Mexico CityMeetings with counterparts
13Nuevo LeónIdentify potential sites for fish farms and hatcheries
14–15Coahuila- ditto -
16–18Don Martín Dam, SinaloaVisit the Macrobrachium rosenbergii pilot plant and commercial catfish farm of Rosario
19–20Mexico CityMeeting with counterparts
21–22Temascal, VeracruzVisit the Macrobrachium hatchery project at Catemaco, and existing hatchery at Temascal
23–24Villahermosa, TabascoIdentify sites for extensive aquaculture projects
25–26Mexico CityMeeting with counterparts
27–28PueblaIdentify sites for commerical fish farms
29–30TlaxcalaIdentify sites for commercial fish farms
1–14 JulyMexico CityPreparation of final report

ANNEX 6

FISHERY PRODUCTION BY MAJOR SPECIES 1967–76

(in tons)

YEAR1967196819691970197119721973197419751976
NATIONAL TOTAL233 433240 072231 982254 472285 654301 890358 000389 969451 330524 689
FOR HUMAN CONSUMPTION197 667194 429185 862201 443232 074241 786268 079259 166293 535282 360
Shrimp42 61536 06133 68042 87243 52447 11746 07647 70543 78647 244
Lobster1 5711 3371 3641 5541 7281 5921 7961 6761 6611 690
Tunas and related8 9717 6049 45010 68014 87213 88717 64719 62427 76525 368
Sardine29 63427 88930 02335 30650 57553 31464 47655 08476 19664 182
Snapper5 1386 1305 1894 3474 9065 3104 2524 5603 8473 533
Oyster20 16824 48432 76432 76428 89726 82325 55626 81326 98829 226
Abalone2 6913 4042 8942 8182 6852 2441 9752 5472 6922 709
Snooks2 8152 8322 5662 6474 5072 7723 4092 3472 0152 191
Mackerels5 9747 0566 4696 6657 0209 7889 9888 5739 0117 463
Turtle10 69214 5745 0494 1702 300214 8092 6403 6973 256
Groupers4 6305 7177 6708 71810 40713 94211 88713 39113 01510 974
Mullet4 1014 0953 8813 1993 7163 8464 8814 1865 5194 330
Shark1 6941 6292 2751 9852 7983 1045 6886 7026 1927 128
Mojarras2 2312 5072 9273 0382 9985 6358 4488 00811 03311 178
Shark2 7592 8432 5872 6873 4853 2634 8325 4374 9876 196
Croakers2 0302 3032 3492 7673 1222 2363 5592 3962 7182 742
Octopus1 6071 9412 1511 5072 4333 6771 9073 3153 5514 547
Clams2 5181 8412 0502 0722 1383 5832 6603 0222 9442 829
Others45 82840 18230 87031 64739 96339 63244 23341 14045 91844 574
FOR INDUSTRIAL USE35 76645 64346 12053 02953 58060 10489 921130 803157 795242 329
Sardine------29 45829 90145 44679 048
Anchovy------13 61938 52355 74877 640
Gulf-weed20 14228 22926 72529 18723 49030 04728 20537 12727 48041 570
Seaweed1 7071 2559129491 6986691 8913 1454 3244 571
Fish meal10 16311 43314 64819 41721 50924 574----
Fish oil360549473483787732----
Others3 3944 1773 3622 9936 0964 08216 74822 10724 79739 500

Source: National plan of Fishery Development

ANNEX 7

EXPECTED OYSTER PRODUCTION BY 1982, AS PROJECTED BY THE DIRECTORATE-GENERAL OF AQUACULTURE

(in tons)

   TAMAULIPASVERACRUZTABASCOCAMPECHENAYARITSINALOASONORABAJA CALIF.BAJA CALIF. (South) OTHER STATES
OriginYearTotalLaguna MadreLaguna de San AndrésPueblo Viejo TamiahuaAlvarado CamaroneraMecoacán Machona Carmen San Blas CamichínB. Ceuta E. Pabellón   Guerrero Oaxaca Jalisco Colima
 1978             
Natural banks   17 9301001 0006 200100  5 0803 600--501  --1 800
Semi-culture   25 90010088012 500-    8 5003 400-2201  ---300
Culture     1 980-120--    420-70  7201  1001  25050  250
Sub-total   45 8102002 00018 700100  14 0007 00070  9401  1501  25050  2 350
 1979             
Natural banks   18 5001001 0006 200100  5 0803 600-2201  501  --1 800
Semi-culture   36 3801001 76014 500100  11 5007 100-7201  ---600
Culture   19 5167001 2404 1001 8002 1 4201 3003 000  3 181   5751  900800  500
Sub-total   74 0469004 00024 8002 000  18 00012 0003 000  4 121   6251  900800  2 900
 1980             
Natural banks   18 3501001 0006 200300  5 0803 600-220   50   --1 800
Semi-culture   55 1612003 00019 500700  15 04012 800-2 921   ---1 000
Culture   33 8421 2002 5005 1002 800  2 8802 6005 500  6 362   1 500   1 2001 300  900
Sub-total 107 3531 5006 50030 8003 800  23 00019 0005 500  9 503   1 550   1 2001 300  3 700
 1981             
Natural banks   18 3501001 0006 200300  5 0803 600-220   50   --1 800
Semi-culture   70 1024006 00022 0001 500  17 16015 200-5 842   ---2 000
Culture   61 8842 5005 0007 4005 200  5 7605 2008 500  12 724   3 000   2 2002 600  1 800
Sub-total 150 3363 00012 00035 6007 000  28 00024 0008 500  18 786   3 050   2 2002 600  5 600
 1982             
Natural banks   18 3501001 0006 200300  5 0803 600-220   50   --1 800
Semi-culture   88 20280010 00025 0002 500  18 40017 040-11 462   ---3 000
Culture 103 2285 0009 0009 2007 100  11 5209 36011 500  25 448   5 000   3 0003 500  3 600
Sub-total 209 7805 90020 00040 4009 900  35 00030 00011 500  37 130   5 050   3 0003 500  8 400

1 Culture system in oyster parks. To consolidate breeding grounds production will not be extracted
2 Seed transferred from the Laguna de San Andrés where the excess has not been utilized

ANNEX 8A

ESTIMATED COSTS AND RETURNS (PER RAFT) OF OYSTER CULTURE (SEED SETTLING ON RACK AND GROWING ON RAFT) IN THE STATE OF NAYARIT

  Mex.$
Construction Costs  
 Materials 50 096   
 Boat 2 400
 Motor 5 140
  57 636   
Annual Operating Costs  
 Labour 5 386
 Fuel and oil 1 460
 Interest 6 916
 Depreciation1 10 302   
 Miscellaneous 1 000
  25 064   
Production (6 428 kg/raft/year)  
 Cost of production/kg           3.90
Revenue (6 428 × Mex.$ 8) 51 424   
Profit 26 360   
Average annual rate of return on investment46 percent 

1 Depreciation period is 10 years for boat, 3 years for motor and 6 years for construction materials

ANNEX 8B

ESTIMATED COSTS AND RETURNS OF A 1.2 HA OYSTER FARM (SEED SETTLING ON RACKS AND GROWING ON THE BOTTOM) IN THE STATE OF VERACRUZ

  Mex.$
Fixed Cost  
 Construction 661 172
Operating Cost  
 Labour 1 004 160   
 Rent of boats 520 800
 Interest (12 percent on construction)   79 340
 Depreciation1 661 172
 Miscellaneous   80 215
  2 345 687  
Production (1 200 t/1.2 ha/year)  
 Cost of production/kg                1.96
Revenue (1 200 × Mex.$ 3 750) 4 500 000   
Profit 2 154 313   
Average annual rate of return on investment326 percent 

1 Depreciation period for construction materials is 1 year.

ANNEX 8C

ESTIMATED COSTS AND RETURNS (PER HA) OF OYSTER CULTURE (SEED SETTLING ON RACKS AND GROWING BOTH ON RACKS AND ON THE BOTTOM) IN THE STATE OF TABASCO

   Mex.$
Fixed Cost   
 Boats (2 × Mex.$ 35 000)  70 000
 Motor (2 × Mex.$ 40 000)  80 000
 Materials and labour for construction  52 470
   202 470  
Annual Operating Costs   
 Labour  70 410
 Gas and oil    4 068
 Maintenance  12 618
 Interest (12 percent on fixed cost)  24 296
 Depreciation1  119 802  
 Miscellaneous  12 146
   243 340  
Production185 t/ha/year  
 Cost of production/kg                1.32
Revenue (185 × Mex.$ 3 500)  647 500  
Profit  404 160  
Average annual rate of return on investment199 percent 

1 Depreciation period is 10 years for boat, 3 years for motor and 1 year for construction materials

ANNEX 9

PRICE AND CONSUMPTION OF OYSTER

YearPer caput
consumption
(kg)		Price/kg
(Mex.$)		Per caput
income
(Mex.$ 1 000)		Consumer price index
19680.520.53  7.4100.0
19690.680.52  7.9103.5
19700.660.62  8.5108.8
19710.560.74  8.9114.6
19720.501.23  9.8120.3
19730.461.5711.4134.8
19740.472.2214.5166.8
19750.452.3517.0191.8
19760.482.3620.1222.1
19770.424.1023.7286.7

Source: Compiled from available data in the Department of Fisheries, Mexico

ANNEX 10

MAJOR FEED MILLS AND THEIR CAPACITIES

PlantsCapacity
(t)
Guadalajara, Jalisco192 000
Autlán, Jalisco33 000
Texcoco, Mexico192 000
Merida, Yucatán84 000
Tlaxcala, Tlaxcala19 800
Matamoros, Tamaulipas42 000
Delicias, Chihuahua21 000
Total583 800

Source: Alimentos Balanceados de Mexico (ALBAMEX)

ANNEX 11

COST OF THE MAJOR FISH FEEDS/TON PRODUCED LOCALLY

SpeciesMex.$
Trout (42 percent protein)7 705
Catfish (38 percent protein)6 965
Ornamental aquarium fish9 705
White fish6 965
Carp, tilapia, etc. (22 percent protein)3 750

Source: Compiled from available data in the Department of Fisheries, Mexico

ANNEX 12

ESTIMATED COSTS AND RETURNS OF A 25-HA SHRIMP FARM, SAN BLAS, NAYARIT

I.Fixed Cost Mex.$
 Construction:  
  Clearing of 25 ha at Mex.$ 3 000/ha 75 000
  Dike construction, 65 620 m3 at Mex.$ 30/m3 1 968 000
 Sluices, wooden; including construction and setting:  
  Main gate (one)Mex.$ 4 300            
  Drain gates (two)1 700 
  Secondary gates (forty)58 800   64 800
 Removal of tree stumps and levelling at Mex.$ 3 000/ha 75 000
 Contingencies (5 percent of construction cost) 109 140
 Equipment:  
  20 in pump with 50 hp diesel motor175 000    
  Outboard motor, 25 hp35 000 
  Fibreglass boat, 7.75 m × 1.75 m × 0.55 m25 000 
  Pump 6 in vertical or angle with 6 HP diesel engine20 000 
  1 light truck pick-up120 000    
  Nets and seines10 000385 000
 Buildings:  
  Caretaker's house 50 000
  TOTAL 2 726 940
    
II.Operating Costs  
 Fixed salaries:  
  1 technician atMex.$ 15 000/m        
  1 caretaker at      4 000/m 
  2 night watchmen at             4 000/each/m324 000
 Casual labour (360 man-days at Mex.$ 100/day) 36 000
 Feeds (60 t at Mex.$ 7 600/t) 456 000
 Pumping (15 percent water exchange daily, or 30 000 m3/day for 200 days, at Mex.$ 0.016/m3) 96 000
 Seeds (1 600 000 at Mex.$ 0.01 each) 16 000
 Fertilizers:  
  20 t of chicken manure (Mex.$ 400/t)   8 000 
    1 t triple superphosphate   3 070 
    1 t urea  2 63013 700
 Gasoline, oil and electricity 8 200
 Exigencies (5 percent of operating cost) 47 495
 Depreciation:  
  Dikes (30 years)65 620 
  Gates (1 year)  9 260 
  Equipment (10 years)38 500 
  Building (20 years)  2 500115 880
 Interest on fixed costs (12 percent) 327 232
  TOTAL 1 440 507
    
III.Production, Revenue, Profit and Return  
 Production   20 000 kg  
 Revenue      (at Mex.$ 138/kg) 2 760 000
 Profit           (2 760 000 - 1 440 507) 1 319 493
 Average rate of return on investment - 48 percent  

ANNEX 13

GOVERNMENT HATCHERIES AND THEIR PRODUCTION

Centres in OperationSpecies ProducedProduction Capacity of Fingerlings 1978
Benito Juarez, ChiapasTilapia4 000 000
Canatlan, DurangoMajor carp, black bass and mojarra (Cichlasoma sp)   900 000
Chapingo, MexicoMirror carp   900 000
El Morillo, TamaulipasCatfish   400 000
El Peaje, San Luis PotosíBlack bass, tilapia and carp4 000 000
El Rodeo, MorelosCarp, tilapia, black bass and frogs (Rana sp)2 500 000
El Zarco, Distrito FederalRainbow trout4 500 000
Jala, ColimaOrnamental fish   500 000
Jaral de Berrio, San Felipe Gto.Mirror carp, tilapia, mojarra (Leponis sp.) black bass1 100 000
La Tortuga, VeracruzCatfish, tilapia, black bass1 000 000
Las Pintas, JaliscoCarp and tilapia   400 000
Pabellon, AguascalientesMirror carp, black bass and mojarra2 500 000
Patzcuaro, Michoacán
Mirror carp, black bass, tilapia charal, (Chirostoma sp.), acumara (Algansea sp.) white fish
9 600 000
Pucuato, MichoacánTrout1 500 000
San Cayetano, NayaritCatfish, black bass, tilapia and frogs1 040 000
Tancol, TamaulipasCatfish, black bass, guapote (Cichlasoma sp.)1 000 000
Temascal, OaxacaTilapia and catfish6 000 000
Tezontepec, HidalgoMirror carp, grass carp and tilapia3 500 000
Tlacolula, Oaxaca    600 000
Zacatepec, MorelosOrnamental fish   600 000
TOTAL 46 540 000  

Source: Compiled by the General Directorate of Aquaculture, Department of Fisheries, Mexico

ANNEX 14

PRODUCTION AND AVERAGE PRICE OF MACROBRACHIUM FOR THE PERIOD 1968–77

YearProduction (t)Average price/kg Mex.$Per caput income Mex.$ 1 000Consumer price index
196818515.05  7.4100.0
196916817.08  7.9103.5
197020017.00  8.5108.8
197126316.73  8.9114.6
197238816.33  9.8120.3
197374616.3811.4134.8
197469714.8414.5166.8
19751 017   29.8917.0191.8
19761 396   42.7220.1222.1
197784058.5723.7286.7

Source: Compiled by the Department of Fisheries, Mexico

ANNEX 15

ESTIMATED COSTS AND RETURNS OF 1 HA FARM OF MACROBRACHIUM ROSENBERGII

  Mex.$
Fixed Cost:  
 Pond construction 300 000
 Water system 100 000
 Nets 10 000
 Storage 18 000
 Other 10 000
  438 000
Annual Operating Cost:  
 Feed (3 t × 3.3 conversion ratio × Mex.$ 4 000) 39 600
 Postlarvae (140 000/ha) 21 000
 Labour (2.4 man-month × 15 000) 36 000
 Interest (12 percent) 51 600
 Land lease 2 400
 Depreciation1 27 000
 Maintenance 10 000
 Miscellaneous 10 000
  197 600
Revenue (production 3 t/ha x Mex.$ 130/kg) 390 000
 Profit 192 400
Average rate of return on investment44 percent 

1 Depreciation period is 30 years for pond, 20 years for water system, 5 years for nets, 20 years for storage and 10 years for others

ANNEX 16

ESTIMATED COSTS AND RETURNS OF LARGE-SCALE (100 HA) TILAPIA FARMING

  Mex.$
Fixed Cost:  
 Pond construction 8 680 000
 Water supply and drainage 720 000
 Transport trucks 300 000
 Nets 25 000
 Storage 400 000
  10 125 000
Annual Operating Costs:  
 Feed (528 × Mex.$ 4 000) 2 112 000
 Labour (4 000 man-days × Mex.$ 70) 280 000
 Fingerlings 306 000
 Land lease 240 000
 Interest on fixed cost (12 percent) 1 215 000
 Depreciation1 393 333
 Miscellaneous 200 000
  4 746 333
Revenue (4 t/ha x 88 ha x Mex.$ 15 000/t) 5 280 000
 Profit 533 227
Average rate of return on fixed cost5.3 percent 

1 Depreciation period is 30 years for pond, 20 years for inlet and outlet 7 years for transport truck, 5 years for netting and 20 years for storage

ANNEX 17

ESTIMATED COSTS AND RETURNS OF SMALL-SCALE (1 HA) TILAPIA FARMING

  Mex.$
Fixed Cost:  
 Pond construction (including water supply and drainage) 130 000
 Nets 10 000
 Storage 15 000
  155 000
Annual Operating Costs:  
 Fingerlings (Government subsidy)             -
 Feed (6 t × 2 000) 12 000
 Labour (40 man-days × Mex.$40) 1 600
 Land lease 2 400
 Interest (7.6 percent) (Government subsidy) 17 700
 Depreciation1 3 575
 Miscellaneous 1 000
  38 275
Revenue (4 t/ha × Mex.$ 12 000/t) 48 000
Profit  9 725
Average rate of return on fixed cost6.3 percent 

1 Depreciation period is 30 years for pond, 20 years for water system, 5 years for nets, 20 years for storage and 10 years for others

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