- •Р.А. Юсупова
- •От автора
- •Unit 1 aquaculture Active vocabulary
- •1 Aquaculture
- •1.1 Read the following international words and translate them. (Mind the part of speech).
- •1.2 Give Russian equivalents of the following words and word combinations.
- •1.3 Read and translate the text with the help of a dictionary.
- •1.4 Answer the questions
- •1.6 Translate the given Russian words into the English ones:
- •1.7 Match the words with their definitions.
- •1.8 Read the text without a dictionary. Aquaculture’s beginnings
- •2 Ancient and modern aquaculture
- •2.1 Read the following international words and translate them. (Mind the part of speech).
- •2.2 Give Russian equivalents of the following words and word combinations.
- •2.3 Read and translate the text with the help of a dictionary.
- •2.4 Give English equivalents:
- •Vocabulary
- •4.5 Give English equivalents:
- •4.6 Translate the given Russian words into the English ones:
- •4.7 Match the words with their definitions.
- •4.8 Topics for discussion
- •Feeding the world through agriculture
- •5 Control over reared species
- •5.1 Read the following international words and translate them. (Mind the part of speech).
- •5.2 Give Russian equivalents of the following words and word combinations.
- •5.3 Read and translate the text with the help of a dictionary.
- •5.4 Give English equivalents:
- •5.9 Answer the questions
- •Unit 2 fish culture Active vocabulary
- •6 The big two in fish culture
- •Choose the equivalents:
- •Aquaculture species in the united states
- •1 Rainbow, brown
- •7.4 Give English equivalents:
- •4Bullhead
- •7.13 Render the following verbs with ing-forms into infinitives and translate them:
- •8 Culture systems
- •8.1 Read the following international words and translate them.
- •8.2 Give Russian equivalents of the following words and word combinations.
- •8.3 Read and translate the text with the help of a dictionary.
- •8.4 Give English equivalents:
- •8.5 Match the words with their definitions.
- •8.6 Fill in the gaps using the words given below:
- •8.7 Answer the questions
- •8.8 Read the text without a dictionary. Types of aquaculture opeations
- •Vocabulary
- •8.9 Match the words with their definitions.
- •8.10 Answer the questions
- •Vocabulary
- •Vocabulary
- •10.5 Translate the given Russian words into the English ones:
- •Vocabulary
- •Vocabulary
- •Vocabulary
- •Vocabulary
- •12.5 Answer the questions
- •13 Potential adverse effects
- •13.1 Read and translate the text with the help of a dictionary.
- •Vocabulary
- •13.2 Answer the questions
- •14 Carp Aquaculture
- •Carp as ornamental fish
- •15 Tilapia Fish farming
- •Nutrition
- •Exotic species
- •Uses other than supplying food
- •In aquaria
- •16 Trout Anatomy
- •Habitat
- •As food
- •River fishing
- •17 Salmon Life cycle
- •Species
- •Atlantic Ocean species
- •Pacific Ocean species
- •Salmon fisheries
- •Salmon aquaculture
- •18 Shrimp Farming
- •Marketing
- •Life cycle
- •19 Grass carp
- •Ecology
- •Invasive species
- •Use as weed control
- •Fishing for grass carp
- •Triploid Grass Carp
- •20 Channel catfish
- •21 Pond
- •Technical definitions
- •Formation
- •Characteristics
- •22 Cage
- •Site Criteria
- •Pond Problems
- •Water Quality
- •Temperature
- •Turbidity
- •23 Raceway
- •Site selection
- •Water flow
- •Maximum load
- •Waste water
- •Appendix
- •Proverbs
- •Библиографический список
17 Salmon Life cycle
In some only a few cells grow on top of theyolk, in the lower right the blood vessels surround the yolk and in the upper left the black eyes are visible, even the little lens.
S
Eggs in different stages of development.
Salmon eggs are laid in freshwater streams typically at high latitudes. The eggs hatch intoalevin or sac fry. The fry quickly develop into parr with camouflaging vertical stripes. The parr stay for six months to three years in their natal stream before becoming smolts, which are distinguished by their bright silvery colour with scales that are easily rubbed off. It is estimated that only 10% of all salmon eggs survive to this stage. The smolt body chemistry changes, allowing them to live in salt water. Smolts spend a portion of their out-migration time in brackish water, where their body chemistry becomes accustomed to osmoregulation in the ocean.
The salmon spend about one to five years (depending on the species) in the open ocean where they gradually become sexually mature. The adult salmon then return primarily to their natal stream to spawn. In Alaska, the crossing-over to other streams allows salmon to populate new streams, such as those that emerge as a glacier retreats. The precise method salmon use to navigate has not been established, though their keen sense of smell is involved. Atlantic salmon spend between one and four years at sea. (When a fish returns after just one year’s sea feeding it is called a grilse in Canada, Britian and Ireland.) Prior to spawning, depending on the species, salmon undergo changes. They may grow a hump, develop canine teeth, develop a kype (a pronounced curvature of the jaws in male salmon). All will change from the silvery blue of a fresh run fish from the sea to a darker colour. Salmon can make amazing journeys, sometimes moving hundreds of miles upstream against strong currents and rapids to reproduce. Chinook and sockeye salmon from central Idaho, for example, travel over 900 miles (1,400 km) and climb nearly 7,000 feet (2,100 m) from the Pacific ocean as they return to spawn. Condition tends to deteriorate the longer the fish remain in fresh water, and they then deteriorate further after they spawn, when they are known as kelts. In all species of Pacific salmon, the mature individuals die within a few days or weeks of spawning, a trait known as semelparity. Between 2% and 4% of Atlantic salmon kelts survive to spawn again, all females. However, even in those species of salmon that may survive to spawn more than once (iteroparity), post-spawning mortality is quite high (perhaps as high as 40 to 50%.)
To lay her
roe,
the female salmon uses her tail (caudal fin), to create a
low-pressure zone, lifting gravel to be swept downstream, excavating
a shallow depression, called a
male
ocean phase Chinook
male
freshwater phase Chinook
Each year, the fish experiences a period of rapid growth, often in summer, and one of slower growth, normally in winter. This results in ring formation around an earbone called the otolith, (annuli) analogous to the growth rings visible in a tree trunk. Freshwater growth shows as densely crowded rings, sea growth as widely spaced rings; spawning is marked by significant erosion as body mass is converted into eggs and milt.
Freshwater streams and estuaries provide important habitat for many salmon species. They feed on terrestrial and aquatic insects, amphipods, and other crustaceans while young, and primarily on other fish when older. Eggs are laid in deeper water with larger gravel, and need cool water and good water flow (to supply oxygen) to the developing embryos. Mortality of salmon in the early life stages is usually high due to natural predation and human-induced changes in habitat, such as siltation, high water temperatures, low oxygen concentration, loss of stream cover, and reductions in river flow. Estuaries and their associations wetlands provide vital nursery areas for the salmon prior to their departure to the open ocean. Wetlands not only help buffer the estuary from silt and pollutants, but also provide important feeding and hiding areas.
Salmon that are not killed by other means show greatly accelerated deterioration (phenoptosis, or “programmed aging”) at the end of their lives. Their bodies rapidly deteriorate right after they spawn as a result of the release of massive amounts of corticosteroids.