TUYỂN TẬP 25 ĐỀ THI HỌC SINH GIỎI MÔN TIẾNG ANH LỚP 6 NĂM 2023 CÓ ĐÁP ÁN (SƯU...
Proliferation of aquatic education
1. Fish Nutrition and FeedingFish Nutrition and Feeding
•• Energy requirements are lower for fishEnergy requirements are lower for fish ((For a fish, floating in the water consumes less energyFor a fish, floating in the water consumes less energy
than standing and walking on legs).than standing and walking on legs).
•• Fish are poikilothermic (coldFish are poikilothermic (cold--blooded) animalsblooded) animals (their body temperature is equal to that of its(their body temperature is equal to that of its
environment)environment) and thus they do not use feed to maintain body temperature asand thus they do not use feed to maintain body temperature as
warmwarm--blooded animals doblooded animals do (e.g. poultry, pigs and cows).(e.g. poultry, pigs and cows).
•• Fish require some lipids such as omegaFish require some lipids such as omega--33’’s that warms that warm--blooded animals do not.blooded animals do not.
•• Fish can absorb some minerals from water through the gills.Fish can absorb some minerals from water through the gills.
•• Lose less energy in protein catabolism and excretion of nitrogenLose less energy in protein catabolism and excretion of nitrogen
–– 1 ATP / N in Ammonia1 ATP / N in Ammonia
–– 4 ATP / molecule of Urea (2 Nitrogen)4 ATP / molecule of Urea (2 Nitrogen)
–– 10 ATP/4 N in Uric acid10 ATP/4 N in Uric acid
Conversion EfficiencyConversion Efficiency
(Fish vs. Warm(Fish vs. Warm--blooded Animals)blooded Animals)
2. Conversion EfficiencyConversion Efficiency
•• Fish require less energy for proteinFish require less energy for protein
synthesis.synthesis.
•• Fish poorly utilize carbohydrates forFish poorly utilize carbohydrates for
energy:energy:
-- Following glucose ingestion, blood glucose levels rise rapidly,Following glucose ingestion, blood glucose levels rise rapidly,
but may take hours to decrease.but may take hours to decrease.
-- Turnover of glucose in trout is 10X slower than in ratsTurnover of glucose in trout is 10X slower than in rats
Fish Have LowerFish Have Lower
Maintenance RequirementMaintenance Requirement
•• Lower Maintenance EnergyLower Maintenance Energy
–– Rainbow TroutRainbow Trout
•• Maintenance Energy = 57kcal/kg bwtMaintenance Energy = 57kcal/kg bwt
–– MammalsMammals
•• Maintenance Energy = 70Maintenance Energy = 70--83 kcal/kg83 kcal/kg
bwtbwt
3. HI
GE DE ME
FE
Net E
Digestion
Recovery ERecovery E
MaintenanceMaintenance
Temp. regulationTemp. regulation
Basic MetabolismBasic Metabolism
UE, GE
Metabolism
DE
ME
GE (Gross energy)GE (Gross energy) = the amount of heat that is released when a substance is
completely oxidised in a bomb calorimeterbomb calorimeter containing 25-30 atmospheres of oxygen.
1 cal (calorie) = 4.184 joules
1 kcal (kilocalorie) = 4 184 joules
CalorieCalorie = The energy required to raise the temperature of 1 g water from 14.5 to 15.5◦C.
5. ﻣﺎهﻲ در اﻧﺮژي ﻣﺼﺮف آﻠﻲ هﺎي ﺷﺎﺧﺺ
ﺷﺪﻩ ﺧﻮردﻩ اﻧﺮژيI =
ﻣﺘﺎﺑﻮﻟﻴﺴﻢM =
رﺷﺪG =
دﻓﻊE =
100 I = 44 M + 29 G + 27 Eﮔﻮﺷﺘﺨﻮار ﻣﺎهﻴﺎن
100 I = 37 M + 20 G + 43 Eﺧﻮار ﮔﻴﺎﻩ ﻣﺎهﻴﺎن
I = M + G + EI = M + G + E
Energy BudgetsEnergy Budgets
IntakeIntake (( II = Income)= Income)
•• MacronutrientsMacronutrients
–– CarbohydratesCarbohydrates
–– Fats/OilsFats/Oils
–– ProteinsProteins
•• MicronutrientsMicronutrients
–– VitaminsVitamins
–– EssentialEssential
•• Fatty AcidsFatty Acids
•• Amino AcidsAmino Acids
•• SugarsSugars
Energy UseEnergy Use ((EE = Expenditure)= Expenditure)
•• RespirationRespiration
•• OsmoregulationOsmoregulation
•• MovementMovement
•• FeedingFeeding
•• DigestionDigestion
•• ReproductionReproduction
I = E Growth = 0
I < E Growth = -
I > E Growth = +
6. Fish DiversityFish Diversity
•• Because there are so many fishBecause there are so many fish
species, extreme variation in fishspecies, extreme variation in fish
digestive systems exist amongdigestive systems exist among
the families.the families.
7. •• Carnivores: large stomach, short intestineCarnivores: large stomach, short intestine
hybrid striped bass salmonidshybrid striped bass salmonids
•• Omnivores: moderate size stomach & intestineOmnivores: moderate size stomach & intestine
channel catfishchannel catfish
•• Herbivores: small stomachs, long intestineHerbivores: small stomachs, long intestine
tilapia grass carptilapia grass carp
•• Trituration and digestion processes also varyTrituration and digestion processes also vary
Diversity of GI TractDiversity of GI Tract
Diversity of GI TractDiversity of GI Tract
trout
carnivore
catfish
omnivore
carp
omnivore
milkfish
planktivore
10. Feeding FrequencyFeeding Frequency
•• Types of GI TractsTypes of GI Tracts
–– Herbivores => Omnivores => CarnivoresHerbivores => Omnivores => Carnivores
•• Size of AnimalSize of Animal
–– Larvae => Juveniles => Adults =>Larvae => Juveniles => Adults =>
BroodstockBroodstock
-- Frequency => 1Frequency => 1--20 times per day20 times per day
Gross Energy ValuesGross Energy Values
•• Carbohydrates (Glucose)Carbohydrates (Glucose)
–– 3.77 kcal/g in fish 1.4 kcal/g3.77 kcal/g in fish 1.4 kcal/g
•• Proteins (Casein)Proteins (Casein)
–– 5.84 kcal/g5.84 kcal/g
•• Fat (Soybean oil)Fat (Soybean oil)
–– 9.28 kcal/g9.28 kcal/g
12. Nutrient RequirementsNutrient Requirements
•• Fish require some lipids such asFish require some lipids such as
omegaomega--33’’s that warms that warm--bloodedblooded
animals do not.animals do not.
Saturated vs. Unsaturated Fatty AcidsSaturated vs. Unsaturated Fatty Acids
•• Saturated fatty acids (SFA)Saturated fatty acids (SFA): the SFA: the SFA’’s of a lipids of a lipid
havehave no double bondsno double bonds between carbons in chainbetween carbons in chain
•• Polyunsaturated fatty acids (Polyunsaturated fatty acids (PUFA): more than onePUFA): more than one
double bond in the chain (double bond in the chain (ωω--33,, ωω--66,, ωω--77,, ωω--9)9)
Higher unsaturated fatty acids (Higher unsaturated fatty acids (HUFA): more than 4HUFA): more than 4
double bond in the chain (double bond in the chain (ωω--33,, ωω--66,, ωω--77,, ωω--9)9)
•• most common polyunsaturated fats contain themost common polyunsaturated fats contain the
polyunsaturated fatty acids (PUFAs)polyunsaturated fatty acids (PUFAs) oleicoleic,, linoleiclinoleic
andand linolenic acidlinolenic acid
•• unsaturated fats have lower melting pointsunsaturated fats have lower melting points
23. FCRFCR = dry feed fed/body weight gain
(Economic Conversion Ratio) ECR(Economic Conversion Ratio) ECR = cost of diet= cost of diet ×× FCRFCR
Weight gainWeight gain (%)= [(final weight – initial weight)/ initial weight] × 100
Specific growth rate (SGR)Specific growth rate (SGR) (%)= [(final weight – initial weight ) / number of days] × 100
Protein efficiency ratio (Protein efficiency ratio (PERPER)) = net weight gain (wet weight)/ protein fed
PER in fish meal = 3.1PER in fish meal = 3.1 -- 3.7 PER in soybean meal = 1.63.7 PER in soybean meal = 1.6
24. Condition factorCondition factor also known as coefficient of conditioncoefficient of condition or lengthlength--weight factorweight factor
KK =
WW is the fish weigthfish weigth in grams, L is its lengthlength in cm.
Example: The fish is 15.5 cm15.5 cm long and weighs 50 g50 g. Then the condition factor is:
K = = 1, 34
Variations in a fish's condition factor primarily reflect state of sexual maturitysexual maturity and degreedegree
of nourishment.of nourishment. Condition values may also vary with fish ageage, and in some species, with
sexsex.
To assess the stoutness of the fish the condition factor may be calculated according
to the following formula:
))ﭼﺎﻗﻲ ﺿﺮﻳﺐﭼﺎﻗﻲ ﺿﺮﻳﺐ==رﺷﺪ ﺷﺎﺧﺺرﺷﺪ ﺷﺎﺧﺺ((
25.
26. ﮐﭙﻮرﻣﺎهﻴﺎنﮐﭙﻮرﻣﺎهﻴﺎن
ﮐﭙﻮرﻣﺎهﻴﺎن ﺧﺎﻧﻮادﻩ)Cyprinidae(ﻴﺮﻳﻦﺷ ﺁب ﺎﯼهﺎهﯽﻣ ﺎﯼهﺎﻧﻮادﻩﺧ ﺮﻳﻦﻣﻬﻤﺘ از ﻳﮑﯽ
ﺴﺘﻨﺪه.ﺎﻣﻞﺷ و ﻮدﻩﺑ ﺎهﺎهﯽﻣ ﺎﻧﻮادﻩﺧ ﺮﻳﻦﺑﺰرﮔﺘ ﺎﻧﻮادﻩﺧ ﻦاﻳ٢٢٠و ﻨﺲﺟ٢۴٢٠ﻪﮔﻮﻧ
ﺖ اﺳ.ﺪﮔﯽ زﻧ ﻮرت ﺻ در ﺎ ﻳ و ﻮدﻩ ﺑ ﻴﺮﻳﻦ ﺷ ﺁب ﻪ ﺑ ﻖ ﻣﺘﻌﻠ ﺁن ﻀﺎﯼ اﻋ ﺎم ﺗﻤ ْﺎ ﺗﻘﺮﻳﺒﺁب در
ﺴﺘﻨﺪه ﻴﺮﻳﻦﺷ ﺁب ﻪﺑ ورود ﻧﻴﺎزﻣﻨﺪ ﺗﻮﻟﻴﺪﻣﺜﻞ ﺑﺮاﯼ ،ﺷﻮرﻟﺐ.ﯽﭘﺮورﺷ ﺎﯼهﺎهﯽﻣ ﺮﻳﻦﻣﻬﻤﺘ
ﮐ و ﺮﮔﻨﺪﻩﺳ ﻮرﮐﭙ ،ﻮرﺁﻣ ﺎﻳ ﻮارﺧﻒﻋﻠ ﻮرﮐﭙ ،ﻮﻟﯽﻣﻌﻤ ﻮرﮐﭙ ﻞﻣﺜ ﯽﺁﺑ ﮔﺮمﺎﻳ اﯼﺮﻩﻧﻘ ﻮرﭙ
هﺴﺘﻨﺪ ﺧﺎﻧﻮادﻩ اﻳﻦ ﺑﻪ ﻣﺘﻌﻠﻖ ،ﻓﻴﺘﻮﻓﺎگ.ﺑﺎﺪودﺣﺪودﺣ١١٠١١٠ﺁب ﺎﯼهﺎهﯽﻣ ﺮوﻩﮔ ﺮﻳﻦﺑﺰرﮔﺘ ﻪﮔﻮﻧﺁب ﺎﯼهﺎهﯽﻣ ﺮوﻩﮔ ﺮﻳﻦﺑﺰرﮔﺘ ﻪﮔﻮﻧ
ﺮان اﻳ ﻴﺮﻳﻦ ﺷﺮان اﻳ ﻴﺮﻳﻦ ﺷﻮﻧﺪ ﺷﯽ ﻣ ﺖ ﻳﺎﻓ ﺮان اﻳ ﺎط ﻧﻘ ﺮ اآﺜ در ًﺎ ﺗﻘﺮﻳﺒ و ﻨﺪ ﺑﺎﺷ ﻲ ﻣ.ﺎﯼ هﺎهﯽ ﮐﭙﻮرﻣ از
ﻣ ﻴﺎﻩﺳ ،ﮐﻮرﻣﺎهﯽ ﺳﺲ ﺟﻤﻠﻪ از ﻣﺎهﯽ ﺳﺲ اﻧﻮاع ﺗﻮانﻣﯽ اﻳﺮان ﻣﻌﺮوف،ﻔﻴﺪﺳ ﺎهﯽﻣ ،ﺎهﯽ
ﺑﺮد ﻧﺎم را ﮐﻮﻟﯽ ﺳﻴﺎﻩ و ﮐﻠﻤﻪ.
The high diversity and expansive distribution of cyprinids have contributed to a long
history of human use (of both cultured and wild-caught stocks) as food, bait, sport,
forage, and ornamentals. A few species are used to control nuisance plants or other
problem organisms (for example, disease-carrying snails).
Cyprinids exhibit considerable variation in morphology, diet, and habitat use. The largest
member of the family is the Giant Barb (Catlocarpio siamensis) of southeastern Asia,
which may reach almost 3 m total length3 m total length (TL) (Smith, 1945). In contrast, the miniature
translucent species Danionella translucidaDanionella translucida from Myanmar (formerly Burma) attains
only 12 mm standard length (SL), and is the smallest freshwater fish known (Roberts,
1986; Britz, 2003).
CyprinidaeCyprinidae
27. Danionella translucida
Catlocarpio siamensis
Trophic diversity is also great, and the family includes planktivoresplanktivores (Bighead Carp,
Hypophthalmichthys nobilisHypophthalmichthys nobilis, and Silver Carp, Hypophthalmichthys molitrixHypophthalmichthys molitrix), herbivoresherbivores
(Grass Carp, Ctenopharyngodon idellaCtenopharyngodon idella), piscivorespiscivores (Colorado Pikeminnow,
Ptychocheilus lucius), and omnivoresomnivores (Common Carp, Cyprinus carpioCyprinus carpio).
Many species have specialized diets, which are reflected in particular morphological
adaptations (for example, the Black CarpBlack Carp, Mylopharyngodon piceusMylopharyngodon piceus, has pharyngealpharyngeal
teethteeth modified for crushing mollusks). Cyprinids live in a wide variety of habitats from
stagnant ponds and small streams to large lakes and swift-flowing rivers.