EVALUATION OF REPRODUCTION AND GROWTH IN CULTURE OF NATIVE MEXICAN TROUTS (Oncorhynchus spp) FROM...
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Transcript of EVALUATION OF REPRODUCTION AND GROWTH IN CULTURE OF NATIVE MEXICAN TROUTS (Oncorhynchus spp) FROM...
EVALUATION OF REPRODUCTION AND GROWTH IN CULTURE OF NATIVE MEXICAN TROUTS
(Oncorhynchus spp) FROM NORTHWESTERN CHIHUAHUA , MEXICO.
NATIONAL RESEARCH CENTER OF AQUACULTURE
EL ZARCO
S.A.G.A.R.P.A.
MVZ. Gerardo Zamora
MEXICAN NATIVE TROUT DISTRIBUTION
Robert J. Behnke
GENERAL OBJETIVES OF PREVIOUS REPORTS
• CONTINENTAL DISTRIBUTION OF SALMONIDS.• MIGRATION AREAS OF MEXICAN TROUTS.• HEAT STRESS TOLERANCE.• TAXONOMY STUDIES• GENERAL DESCRIPTIONS
COPE 1886 NELSON, E.W. 1898.
MEEK 1904 EVERMANN 1908
NEEDHAM 1955 MILLER, R.R. 1950’S
LEOPOLD, FINDLEY and. HENDRICKSON
ACTUAL STATUS
• COMMERCIAL TROUT FARMS – 54 in Chihuahua and 12 in Durango
• INVOLUNTARY MIGRATION– GENETIC CROSSES WITHOUT OBJETIVES– GENETIC CONTAMINATION
• LOST OF ORIGINAL TRAITS
• TRAPS DEVELOPMENT• OFFICIAL NORM FOR GENETIC PROPOUSES.
– (IN PROGRES)
MEXICAN NATIVE TROUT (Oncorhynchus spp.)
IN CAPTIVITY
• REPRODUCTIVE TRAITS EVALUATION • GROWTH TRAIT EVALUATION• DESCRIPTION AND ETHOLOGY
OBJETIVES
MEXICAN NATIVECAPTURE
• CAPTURED:OCTUBER, 1999 • PLACE: EL LARGO, CHIHUAHUA• RIVERS:• CHUHUICHUPA Lat 29º45’23“ N Long 108º26‘18“ W
• GUAYNOPA Lat 29º31‘46“N Long 108º31‘08“ W
• ALTITUDE 1700 A 1800 m. o.s.l.• DEEP: 30 - 120 cm. • WATER TEMP. 12°C A 14°C
CAPTURED
Plastic bag
AIR TRANSPORTACION
NATIONAL CENTER FOR AQUACULTURE EL ZARCO
S.A.G.A.R.P.A.
• EGG – EYED AND OFFSPRING RAINBOW TROUT PRODUCTION
• NATIVE MEXICAN GENETIC BANK ( ex situ) FOR RESEARCH
NATIVE TROUT DESCRIPTION
• TOTAL LENGTH AVERAGE 12 cm. • DORSAL FIN EDGE: ORANGE BRIGTH• FINS: RED BRITGH • VENTRAL AND ANNAL FINS: EDGE WITH. • SPARR SPOTS: EARLY AGES.• MALES: BRIGTH COLORS
REPRODUCTIVE INDIVIDUAL OF NATIVE TROUT
GONADS IN DEVELOPMENT
REPRODUCTIVE FEMALE August 2001
REPRODUCTIVE MALE August 2001
REPRODUCTIVE METHODS
OBSERVATION AND EVALUATIONPERIODICALLY
ARTIFICIAL REPRODUCTION JANUARY TO MARCH 2000
dry method
RESULTS• EGG PRODUCTION: 88 TO 150 eggs• DIAMETER of the EGG 3.6± 0.2 mm • EGG WEIGHT 39 ± 5 mg.• INCUBATION 11º C WATER
TEMPERATURE
EMBRYO DEVELOPMENT
• EGG EYED 18 DAYS
• FERTILITY 60%
• HATCH
30 TO 35 DAYS• VIABILITY
80%
• VITELIN SAC ABSORTION 28 A 31 DAYS • VIABILIDAD 70%• GROWTH
• 60 DAYS WEIGHT 63 mg. LENGTH 2.1 cm• 455 DAYS WEIGHT 14 gr. (10-29 gr) LENGTH 12
cm. (10 -17 cm)
ETHOLOGY
• MALES: AGRESIVE AND NERVOUS
• LIVE FOOD ONLY
• RESISTENCE TO MANAGEMENT
DISCUSSION
• No previous results has been reported.
• This can be a new specie o variety of Oncorhynchus
BEHAVIOR COMPARATION WITH DOMESTIC TROUT (Oncorhynchus
mykiss)
• SAME EMBRYONAL DEVELOPMENT TIME
• VITELIN SAC ABSORPTION REQUIRES (28 to 31 vs 18 days)
• SLOW GROWTH
• ONLY LIVE FOOD
• NATURAL BREEDING
RECOMMENDATION
• MORE STUDIES IN DIFFERENT STAGES TO EVALUATE GROWTH.
• MOLECULAR GENETICS• mtDNA GENETIC SECUENCESTO ANALYZE
GENETIC STRUCTURE• GENETIC RELATIONS WITH OTHER PACIFIC
SALMONIDS
GRATEFULNESS
• SECRETARIA DE AGRICULTURA, GANADERIA, DESARROLLO RURAL, PESCA Y ALIMENTACION
• DELEGACION ESTATAL EN EL ESTADO DE MEXICO• COMISION NACIONAL DE ACUACULTURA Y PESCA• CONALEP EL ZARCO ESTADO DE MEXICO• APOYADO POR LA FEDERACION MEXICANA DE PESCA
DEPORTIVA EN AGUAS INTERIORES A.C.• FACULTAD DE MEDICINA VETERINARIA YZOOT.U.N.A.M.
Oncorhynchus mykiss var. nelsoni
STREAM SAN RAFAEL, SIERRA DE SAN PEDRO MARTIR, B.C.N.