Comprehensive University Study Notes on Marine and Freshwater Aquaculture

MULLET (KEFAL) AQUACULTURE

  • Environmental Requirements     - Mullet are euryhaline fish capable of living in salt, brackish, and fresh waters in tropical and temperate regions.     - They exhibit high resistance to biological factors such as temperature, oxygen, and salinity.     - They can survive in lagoons where salinity rises to %0.60\% 0.60 and can adapt to freshwater environments.     - Temperature tolerance ranges from 3.5∘C3.5^{\circ}\text{C} to 35∘C35^{\circ}\text{C}.     - Migration patterns: Mullets migrate from the sea to shores, lagoons, and river mouths for feeding.

  • Feeding Habits     - Post-larvae begin feeding on zooplankton.     - They develop into omnivores, consuming crustaceans, mollusks, algae, and detritus.     - Adult preference: Sarig (1977) reports a preference for copepods before spawning migrations and algae during the spawning season.     - Juveniles primarily prefer diatoms and copepods.

  • Reproduction and Egg Characteristics     - Spawning occurs in sea water at depths of 100−150 m100-150\,m slightly away from the shore.     - Eggs are spherical, transparent, and approximately 1 mm1\,mm in diameter with a rough shell surface.     - Eggs are pelagic and hatch within 4−54-5 days. The yolk sac disappears at day 66 or 77.     - M. capito lab results: Eggs developed in 36−4436-44 hours at 22∘C−23∘C22^{\circ}\text{C}-23^{\circ}\text{C} and floated during development.     - M. cephalus lab results: Eggs sank after 20−2220-22 hours, making collection with plankton nets difficult.

  • Sexual Maturity by Species     - Small Species (M. labeo and M. saliens): Males mature at 3−43-4 years, females at 5−65-6 years.     - Large Species (M. chelo, M. auratus, and M. cephalus): Males mature at 6−76-7 years, females at 7−87-8 years.     - Fecundity: Approximately 1−1.5 million1-1.5\,\text{million} eggs per kgkg of body weight.

  • Spawning Seasons in Mediterranean and Black Sea     - Black Sea: M. cephalus starts first; spawning for M. saliens, M. cephalus, and M. auratus typically completes in September–October.     - Mediterranean: M. saliens spawns first, followed by M. cephalus. M. auratus and M. capito start at the end of November after M. cephalus finishes.     - M. chelo is the latest, spawning during winter months.

  • Species Suitability for Culture     - Mullets are ideal due to high meat quality, wide temperature/salinity tolerance, and low-trophic feeding on benthic algae and plankton.     - Growth performance in ponds (based on trials):         - M. cephalus: Survival %100\% 100, Final weight 402 g402\,g.         - M. capito: Survival %20\% 20, Final weight 110 g110\,g.         - M. saliens: Survival %24\% 24, Final weight 55 g55\,g.         - M. chelo: Survival %10\% 10, Final weight 89 g89\,g.         - M. auratus: Survival %5\% 5, Final weight 70 g70\,g.     - Preferred species for polyculture: M. cephalus (highest growth) followed by M. capito.

  • Wild Fry Collection (Natural Seed Supply)     - Timing: Fry enter rivers two months after spawning.         - M. saliens: July–September.         - M. cephalus: September–January.         - M. capito: January–April.         - M. auratus: April–June.     - Sites: M. saliens in shallow waters; M. capito and M. cephalus at river mouths initially.     - Collection Method: Low-mesh nets; nighttime operations may use 600−1400 W600-1400\,W lights.     - Density per operation: Should be limited to 200−400200-400 fry to prevent crowding-induced mortality.

  • Transport and Acclimatization     - Stocking density for transport: 20002000 fry per 250 L250\,L of water.     - Tank salinity: Mix equal parts of river water and fresh water to reduce salinity by half (3000−5000 mgCl/L3000-5000\,mgCl/L).     - Mortality: Rapid changes in temperature (>3∘C>3^{\circ}\text{C} difference) or salinity (<690 mgCl/L<690\,mgCl/L) cause high mortality.     - Quarantine: Fry are held in fiberglass or concrete tanks for 3−153-15 days, disinfected with formalin, and fed soy flour/fish meal.

  • Artificial Propagation (Seed Production)     - Broodstock: 44-year-old fish, 32−50 cm32-50\,cm length, 1−1.2 kg1-1.2\,kg.     - Maturation monitoring: Eggs sampled via 0.85 mm0.85\,mm polyethylene tube in oviduct. Female is ready for injection if egg diameter is at least 0.6 mm0.6\,mm.     - Hormones/Vitamins:         - Synahorin (Chorionic gonadotropin + mammal pituitary).         - Gonadotropin (RU units or IU).         - Vitamin E (Acetate-dl-alpha-tocopherol).         - Dose: Total 2.5−62.5-6 mullet pituitaries combined with 10−60 RU10-60\,RU Synahorin and 0.300 mg0.300\,mg Vitamin E.     - Injection site: Back muscles.     - Spawning: Controlled in 200 L200\,L aquariums or stripped manually (Dry or Wet methods).     - Fecundity: 1 million1\,million eggs per kgkg.

  • Larval Rearing     - Density: 1010 larvae per LL.     - Size: Hatchlings are 2.5−3.5 mm2.5-3.5\,mm. At day 44, eyes pigment and feeding begins.     - Feeding sequence:         - Initial: Fertilized oyster eggs/larvae (400−500400-500 per mlml) or rotifers.         - Algae: Dunaliella, Chlorella, Isochrysis (10 million10\,million cells per LL).         - Zooplankton: Brachionus plicatilis (5000−100005000-10000 per LL).         - Advanced: Artemia.     - Critical survival periods: Days 3−43-4 and 11−1411-14. Total survival is typically max %20\% 20.

  • Adult Rearing Methods     - One-year Freshwater Culture: Multi-culture with carp. Stocking 3000030000 fry (0.3 g/22 mm0.3\,g/22\,mm) per hectare. Result: M. cephalus reaching 500 g500\,g at year's end.     - Two-year Freshwater Culture (Israel): Fed grain/pellets. Stocking density 750−1200 fish/h750-1200\,fish/h. Target weight >1 kg>1\,kg.     - Lagoon ("Valli") Culture (Italy): Polyculture with eels, seabream, and sea bass. Production levels 90−200 kg/h90-200\,kg/h.     - Salt Pan Culture (France): Reconverted salt ponds. Production levels 100 kg100\,kg mullet and 50 kg50\,kg eel per hectare.

RED SEABREAM (MERCAN BALIĞI) CULTURE

  • Development History     - Species: Pagrus major.     - Japan started trials in 1887; major success achieved in 1958; economic scale since 1962.

  • Biology and Growth     - Length estimates: 15 cm15\,cm (Year 1), 20 cm20\,cm (Year 2), 25 cm25\,cm (Year 3), 35 cm35\,cm (Year 5), 40 cm40\,cm (Year 7), 50 cm50\,cm (Year 10).

  • Broodstock and Spawning     - Hormones: Gonadotropin, Synahorine, and Macrobin injected intramuscularly (200 μg/kg200\,\mu g/kg daily doses).     - Natural spawning: Happens at sunset in June at 15−22∘C15-22^{\circ}\text{C}. Eggs are 1.2 mm1.2\,mm diameter with a 0.25 mm0.25\,mm oil droplet.     - Yield: 1 million1\,million eggs from a 4 kg4\,kg female; 300,000300,000 eggs from a 1 kg1\,kg (44-year-old) female.

  • Incubation     - Water hygiene: Eggs washed with clean seawater; dead eggs (white) must be removed via siphon.     - Hatching time: 6060 hours at 15∘C15^{\circ}\text{C}; 4040 hours at 18∘C18^{\circ}\text{C}. Development stops below 10∘C10^{\circ}\text{C}.     - Light: 100−3000 lux100-3000\,lux.

  • Larval Feeding and Management     - Density: 2020 larvae per LL.     - Sequence:         - Days 1−101-10: Rotifers (2020 per larva/day).         - Days 10−3010-30: Artemia (2020 per larva/day).         - Days 30−5030-50: Chopped shrimp and fish meat.     - Salinity: Reduced to %0.24\% 0.24 over 3030 days.     - Survival: Typically only %5−10\% 5-10. High mortality when yolk sac is depleted and eyes color (Days 4−74-7).

  • Nutritional Requirements     - Protein: Growth continues up to %55\% 55 protein levels.     - Carbohydrates: Glucose at %20\% 20 is preferred; levels above %30\% 30 cause liver fat/glycogen issues.     - Fats: Optimum fish oil level is %10\% 10. Vegetable oils (corn/soy) are less effective due to lack of long-chain unsaturated fatty acids.     - Vitamins: Deficiencies in B6, Choline, and Pantothenic acid lead to high mortality.     - Minerals: Phosphorus (P) is mandatory at 680−1360 mg680-1360\,mg per 100 g100\,g.

STURGEON (MERSİN BALIĞI) CULTURE

  • Biology     - Maturity: Males 6−126-12 years, females 12−1712-17 years.     - Egg characteristics: 1−3 mm1-3\,mm diameter, dark gray to black, sticky (attach to gravel).     - Hatching: In 3−103-10 days at 12−17∘C12-17^{\circ}\text{C} (roughly 90 degree-days90\,\text{degree-days}).

  • Broodstock Maturation     - Pituitary extraction: Taken from a point 1−2 cm1-2\,cm behind the eyes using a hollow drill. Stored in acetone at 5∘C5^{\circ}\text{C}.     - Pituitary weight: 30−150 mg30-150\,mg (fresh), 10−80 mg10-80\,mg (dry).     - Preparation: Ground to flour and dissolved in %0.7\% 0.7 saline water.     - Injection doses (PIT units in mgmg):         - A. stellatus: 35−50 mg35-50\,mg (15−17∘C15-17^{\circ}\text{C}).         - A. guldenstaedtii: 60−80 mg60-80\,mg (12−14∘C12-14^{\circ}\text{C}).         - Huso huso: 150−300 mg150-300\,mg (8−14∘C8-14^{\circ}\text{C}).

  • Spawning and Stripping     - Males: Sperm collected in aluminum vessels; viable for 4040 minutes at room temp, or long-term at −50∘C-50^{\circ}\text{C}.     - Females: Strip eggs using a mid-ventral incision from anus to throat.     - Stickiness prevention: Fertilized eggs are mixed with fine clay (red mud) for 4545 minutes to prevent clumping.

  • Hatchery and Larvae     - System: Yusenko-type hatchery (4 basins per unit). Eggs aerated every 1515 seconds.     - Larvae: Hatch with large yolk sacs. Density 40−6040-60 larvae per cm2cm^2.     - Feed: Artemia after yolk depletion (3−43-4 days), followed by Daphnia and finely chopped white worms (Enkhedrious arbidus).     - White Worm Culture: Grown in boxes (50×70×10 cm50\times 70\times 10\,cm) with soil and saw dust/leaf mix. Fed vegetable syrup.

  • Pond Maturation     - Stocking: 4−64-6 fingerlings per m2m^2 in 0.5−2 h0.5-2\,h ponds.     - Fertilization: 34 kg34\,kg Nitrogen and 30 kg30\,kg Phosphorus per 2 h2\,h every 1010 days.     - Result: Reach 3−5 g3-5\,g in 30−4030-40 days for river release.

YELLOWTAIL (SARI KUYRUK) CULTURE

  • Environmental Standards     - Best growth temperature: 18−27∘C18-27^{\circ}\text{C}; lethargy below 11∘C11^{\circ}\text{C}; mortality at 9∘C9^{\circ}\text{C} or above 32∘C32^{\circ}\text{C}.     - Salinity: Prefers >16 ppm>16\,ppm. Density 1.0251.025.     - Oxygen: Average demand 500 ml/kg/hr500\,ml/kg/hr. Avoid levels below 3 mg/L3\,mg/L.

  • Seed Collection and Rearing     - Wild collection: 15 mm15\,mm larvae arrive on shores in April-May. Captured via purse seine nets.     - Artificial Hatching: Eggs hatch in 51−6851-68 hours at 18−24∘C18-24^{\circ}\text{C} (%60\% 60 hatch rate).     - Cannibalism: Sorting into 3 size groups is mandatory to prevent up to %50\% 50 mortality.     - Larval Growth: 10 mm10\,mm (Day 20), 50 mm50\,mm (Day 49), 63 mm63\,mm (Day 60).

  • Cage culture     - In-shore vs. Off-shore: Hanging cages for high-wave areas; floating cages for sheltered bays.     - Growth Rate: Stocked in May (7−60 g7-60\,g), reaching 200−700 g200-700\,g in August, and 700−2000 g700-2000\,g by December.     - Feed: Primarily raw fish (Anchovy, Mackerel). Caution: Oxidized fats in anchovies can cause %100\% 100 mortality.     - Commercial Feed: High protein (%45\% 45), low carb (∼%15\sim \% 15). Carbohydrate digestion is poor (∼%30\sim \% 30).

  • Diseases     - Benedinia seriolae: Flat parasite (6−7 mm6-7\,mm). Treatment: 10−13 ppm10-13\,ppm nitrofurazone or freshwater bath.     - Axine heterocerca: Gill parasite. Treatment: %9−10\% 9-10 saline bath for 33 minutes.     - Green Liver Syndrome: Caused by oxidized fats. Treatment: 17 g17\,g Glucuronolactone per kgkg feed.

FLATFISH (YASSI BALIK) CULTURE

  • Main Species     - Plaice (Pleuronectes platessa) and Sole (Solea solea).     - Black Sea Turbot (Scophthalmus maeoticus).

  • Reproduction     - Spawning: February–May.     - Hormones: 500 IU500\,IU HCG after sedation with MS-222.     - Incubation: 30,000−40,00030,000-40,000 eggs per trough. Hatch in 33 weeks at 6∘C6^{\circ}\text{C}; 48−5048-50 hours at 20−22∘C20-22^{\circ}\text{C}.

  • Larval Rearing and Metamorphosis     - Metamorphosis to benthic form takes 6−76-7 weeks. Accelerates with high Artemia feeding (16−1816-18 days).     - Survival: Typically max %28\% 28.     - Stocking (Heated water): Growth increases in effluent from nuclear power stations (10−23∘C10-23^{\circ}\text{C}). Stocking up to 900 fish/m2900\,fish/m^2.

  • Turbot (Kalkan)     - Stocking density: 41 kg/m341\,kg/m^3.     - Feed: 50−60%50-60\% protein pellets.     - Growth: 4 g4\,g to 1.5 kg1.5\,kg in 24−3024-30 months.

EEL (YILAN BALIĞI) CULTURE

  • Life Cycle     - Leptocephalus: Pelagic larva, transparent, 56 mm56\,mm, lasts 2.5−32.5-3 years.     - Elver (Glass Eel): 6−7 cm6-7\,cm, enters rivers when temp >8∘C>8^{\circ}\text{C}.     - Yellow Eel: Stage of growth in fresh water (%5−15\% 5-15 body fat).     - Silver Eel: Pre-migration stage (%25−28\% 25-28 body fat, enlarged eyes).

  • Feeding and Growth     - Temperature limit: No feeding below 10∘C10^{\circ}\text{C}; optimum at 25∘C25^{\circ}\text{C}.     - Commercial Feed: 55−62%55-62\% white fish meal, 15−23%15-23\% alpha-starch. Mixed with fish meat in 3:73:7 ratio.     - Growth restriction: Harvested at 150−200 g150-200\,g. Weights >300 g>300\,g are avoided due to poor feed conversion (4.5−74.5-7).

  • Culture Systems     - Static Water: Density up to 2.5 kg/m22.5\,kg/m^2. Oxygen provided by phytoplankton. Uses a "Havuzcuk" (mini-pond) at the water inlet for nocturnal oxygenation.     - Circulation System: 100 kg100\,kg production from 3.3 m23.3\,m^2.     - Tunnel System: Uses underground clay pipes (23 cm23\,cm diameter, 4.8 m4.8\,m length).

  • Diseases and Parasites     - Cotton Cap (Saprolegnia): Fungal growth on head/tail in spring/autumn.     - Red Fin: Bacterial (Aeromonas punctata). Occurs when temp >28∘C>28^{\circ}\text{C}.     - Gas Bubble Disease: Seen in fry due to hyper-oxygenation.

SALMONID CULTURE

  • Species Overview     - Pacific Salmon: Chum (O. keta), Sockeye (O. nerka), Pink (O. gorbuscha), Coho (O. kisutch), Chinook (O. tschawytscha).     - Atlantic Salmon: Salmo salar.

  • Pacific Salmon Lifecycle Duration     - Pink: Shortest cycle (2 years total).     - Chinook: Largest (up to 45 kg45\,kg).     - Chum: High fecundity (2000−50002000-5000 eggs/kg).

  • Atlantic Salmon Rearing     - Egg incubation: 440−510 degree−days440-510\,degree-days (Approx 50−6050-60 days at 8−10∘C8-10^{\circ}\text{C}).     - Alevin stage: 20−3020-30 days.     - Smoltification: Transition from fresh to salt water. Atlantic salmon take 1616 months to reach smolt stage (∼40 g\sim 40\,g).     - Density: Max 30 kg/m330\,kg/m^3. Higher densities cause "Fin Rot."

  • Water Quality Parameters     - Ammonia: Max 0.0125 mg/L0.0125\,mg/L.     - Carbon Dioxide: Max 10 mg/L10\,mg/L.     - Oxygen: At 20∘C20^{\circ}\text{C}, demand is 350 mg/kg fish/hour350\,mg/kg\,fish/hour.

SEA BREAM (ÇİPURA) AND SEA BASS (LEVREK) CULTURE

  • Gilt-head Seabream (Sparus aurata)     - Biology: Protandrous hermaphrodite (Male at year 1-2, Female at year 3-4).     - Optimal temperature: 22−25∘C22-25^{\circ}\text{C}. Lethal below 3∘C3^{\circ}\text{C}.     - Hatchery: Light at 1500 lux1500\,lux (surface). Salinity %35\% 35.     - Feeding: Rotifers (25/ml25/ml) starts day 5−105-10. Artemia nauplii (45/ml45/ml) starts day 1515.

  • European Sea Bass (Dicentrarchus labrax)     - Biology: Dioecious (Separate sexes). Spawns at 12−15∘C12-15^{\circ}\text{C}.     - Growth: 2 g2\,g fingerlings reach pazar weight in 12−1812-18 months.     - Diseases: Vibrioz (Vibrio anguillarum) is the primary bacterial threat, especially in winter or during stress.

RAINBOW TROUT (ONCORHYNCHUS MYKISS) CULTURE

  • Environmental Tolerance     - Spawning: 7−13∘C7-13^{\circ}\text{C}. Growth stops at 7−10∘C7-10^{\circ}\text{C}.     - Oxygen: Minimum 6−7 mg/L6-7\,mg/L in ponds. Consumption increases for 44 hours after feeding.     - pH range: 6−96-9. Lethal threshold at 4.5−54.5-5.

  • Incubation periods (Degree-days)     - Rainbow Trout: 300−350 degree−days300-350\,degree-days.     - Brown Trout: 410−460 degree−days410-460\,degree-days.

  • Feeding Strategy     - Rates: 0.55%0.55\% of body weight at 3−4∘C3-4^{\circ}\text{C}; 3.10%3.10\% at 7−12∘C7-12^{\circ}\text{C}.     - Protein: High energy diets require %35\% 35 protein; standard larvae diets %50−55\% 50-55.

  • Medications and Baths     - Salt: %3\% 3 for 3030 mins for parasites.     - Malachite Green: 1/250,0001/250,000 for 11 hour for eggs (anti-fungal).     - Formalin: 1/40001/4000 for 11 hour for Costia.     - Copper Sulfate: 1/20001/2000 for 1−21-2 mins for gill disease.

ENVIRONMENTAL IMPACT AND BIOTECHNOLOGY

  • Environmental Footprint     - Nutrient Load per Ton of Fish: 78 kg78\,kg Nitrogen (NN) and 9.5 kg9.5\,kg Phosphorus (PP).     - Sediment Impact: Redox potential becomes negative; methane/H2S gas bubbles can burn fish gills.     - Benthic Change: Dominance of indicator species like Capitella capitata near cages.

  • Biotechnology Applications     - Gynogenesis: Production of offspring with only maternal DNA using UV-irradiated sperm and pressure/heat shocks (XXXX only).     - Triploidy: Induced through heat/pressure shock to retain the second polar body, resulting in sterile 3N3N fish with better growth post-maturity.     - Tetraploidy: Retention of polar bodies to create 4N4N broodstock.     - Sex Reversal: Use of androgens (Methyltestosterone) to create phenotypic males from genetic females to produce %100\% 100 female populations.

INTEGRATED COASTAL ZONE MANAGEMENT (ICZM)

  • Principles     - Principle 4: The Sea is the focal point.     - Principle 9: "Develop with nature"—use waves, tides, and winds as energy sources.     - Principle 11/12: Sustainability and multi-use over single-use systems.

  • Conflicts     - Balancing marine transport, fishing, tourism, and industry to minimize "externalities" (uncompensated environmental costs).