Recursos de colección

Aquatic Commons (36.861 recursos)

The Aquatic Commons is a thematic digital repository covering the natural marine, estuarine /brackish and fresh water environments . It includes all aspects of the science, technology, management and conservation of these environments, their organisms and resources, and the economic, sociological and legal aspects.

Subject = Biology

Mostrando recursos 1 - 20 de 5.677

  1. Chronic turbidity and stress in juvenile coho salmon and steelhead trout

    Redding, Joseph M.; Schreck, C.B.
    The goal of this project was to assess the general physiological responses of stress in coho salmon, Oncorhynchus kisutch, and steelhead trout, Salmo gairdneri, with respect to suspended solids in the aquatic environment and to relate these responses to the fish's capacity to survive and perform necessary physiological functions.

  2. The size and structure of pelagic dolphin herds

    Scott, Michael David

  3. Thalassoma lunare (Linnaeus, 1758)

    Ketabi, Ramin; Jamili, Shahla
    Thalassoma lunare is also named the Moon Wrasse because of its yellow caudal fin shapes like crescent moon with long upper and lower lobes. It is an inhabitant of coral reefs and surrounding areas at depths from 1 to 20. T. lunare is the most abundant wrasse species in the Persian Gulf. This species can reach 16 cm in total length in Iran, Persian Gulf, Kish Island. Moon wrasses are active fish, said to be moving all day long. They are also territorial, nipping, chasing, and otherwise harassing fish that get in their way. Being diurnal, wrasses have strong vision,...

  4. Sepia pharaonis (Ehrenberg, 1831)

    Ketabi, Ramin; Jamili, Shahla
    The Sepia pharaonis (pharaoh cuttlefish) is a large cuttlefish species, growing to 80 cm in mantle length. Males are larger than females, the maximum recorded size for males is 80 cm and 5 kg, and for females 50 cm and 2 kg in weight (Iran, Persian Gulf, Kish Island). This cuttlefish lives in warm water (30°C) and is fast growing. They mate and spawn at 110 days and their life span is 240 days. They lay about 1500 eggs which take 14 days to develop at 28°C. Inhabiting the neritic zone, it is often found in depths up to 130...

  5. Valenciennea sexguttata (Valenciennes, 1837)

    Ketabi, Ramin; Jamili, Shahla
    Valencienna sexguttata, the Sixspot goby, is a species of goby native to the Indian Ocean and the western Pacific Ocean. It inhabits bays or lagoons in waters of from 1 to 25 meters with silt or sand substrates with larger pieces of rock under which to burrow. Maximum length is 12 cm in Persian Gulf (Iran, Kish Island). V. sexguttata usually in pairs and lives in a burrow under rocks. Commonly seen in aggregations over large areas in lagoons of atolls. They are tireless workers, remain on all the substrate very clean due to the peculiarity of their power. The...

  6. Gymnothorax undulatus (Lacepède, 1803)

    Ketabi, Ramin; Jamili, Shahla
    The Gymnothorax undulatus (undulated moray) is a distinctive moray eel, taking its name from the pattern of light undulating lines that form a faint net-pattern along its long, sinuous body. Like other moray eels, the undulated moray does not have scales, and so to protect itself from parasites and scrapes, it secretes a protective layer of mucus over the thick, muscular body. The G. undulatus is a nocturnal species that uses its keen sense of smell to actively and aggressively hunt for fish, octopus and crustaceans, consuming almost anything that will fit in its mouth. When prey is captured, it...

  7. Holothuria hilla (Lesson, 1830)

    Ketabi, Ramin; Jamili, Shahla
    Holothuria hilla is belong to soft-bodied holothuroid, a nocturnal species and is found on inner reef flats, usually in seagrass beds or coral rubble, to depths of 3-20 m. During the day H. hilla can be found under coral rubble, emerging at night to feed. Detritivorous deposit feeder.. During the day it was found under coral rubble, emerging at night to feed. Members of the class Holothuroidea are gonochoric and have only one gonad. H. hilla has asexual and sexual reproduction. This species is usually rare, it is likely that the species has proliferated on rarely site by asexual reproduction...

  8. Scorpaenopsis barbata  (Rüppell, 1838)

    Ketabi, Ramin; Jamili, Shahla
    Scorpaenopsis barbata, lives along sandy beaches, rocky coastlines and coral reefs and in shallow waters. Its name refers to the fleshy outgrowth of skin protruding from its chin. They have a wide mouth and broad spiny head and venom glands that may occur at the base of fin spines which can produce deep and painful wounds. The feathery fins which cover the scorpion fish body help in the camouflaging of the animals into the surrounding coral. Also, the coral- like frilly, fleshy flaps of skin protruding from its chin add to the species camouflage ability and help the fish to...

  9. Platax teira (Forsskål, 1775)

    Ketabi, Ramin; Jamili, Shahla
    Platax teira, also known as the teira batfish, longfin batfish, longfin spadefish is known to associate with floating seaweed, debris and artificial reefs. We report for the first time from Persian Gulf (Kish Island, Iran). Maximum length is 40-50 cm in Persian Gulf. Juveniles and adults occur inshore on protected reefs and in mangrove areas and also on wrecks and deep reefs to 20 m; they may be solitary, in pairs, or in large schools. Small juveniles with floating debris and form aggregations as they find each other. They can be pelagic to large sizes and form schools under large...

  10. Gobiodon citrinus  (Rüppell, 1838)

    Ketabi, Ramin; Jamili, Shahla
    Gobiodon citrinus, the Poison Goby, is a species of goby native to the Indo-West Pacific: Red Sea south to Delagoa Bay, Mozambique and east to Samoa, north to southern Japan, south to the Great Barrier Reef, we report for the first time from Persian Gulf (Kish Island, Iran). Maximum length is 6 cm in Persian Gulf. They are reef dwellers being found at depths of from 2 to 8 meters (in Kish Island, Iran) and in association with Acropora corals. The mucus produced by this fish is toxic. Juveniles have bright yellowish tones (with some darker variations according to geographic...

  11. Doryrhamphus excisus abbreviatus (Dawson, 1981)

    Ketabi, Ramin; Jamili, Shahla
    D. excisus abbreviatus is classified by IUCN Red List, it is belong to a group of brightly-coloured flagtail pipefish. This species is endemic to the Red Sea from the Gulf of Suez south to Massawa and Jiddah on the east coast, we report for the first time from Persian Gulf (Kish Island, Iran). Most Doryrhamphinae pipefishes will breed readily in captivity when given enough shelter and can live for about five to ten years. Males may be brooding at 33 mm Standard Length (Dawson 1981). Male Doryrhamphus brood eggs semi-exposed under the trunk, and sometimes have a thin skin covering...

  12. Pseudochromis olivaceus  (Rüppell, 1835), Olive Dottyback

    Ketabi, Ramin; Jamili, Shahla
    Pseudochromis olivaceus (Olive Dottyback) was always found in association with coral overhangs or large rubble pieces on hard bottom substrates, and would retreat under the rubble or overhang when approached. P. olivaceus is species of Pseudochromis native to Gulf of Aqaba, Indian Ocean: Red Sea, we report for the first time from Persian Gulf (Kish Island, Iran). Relatively large specimens of P. olivaceus that inhabit these corals were observed preying on settlers of Dascyllus spp. Maximum length is 8 cm in Persian Gulf. They are reef dwellers being found at depths of from 4 to 8 m and in association...

  13. Pempheris vanicolensis (Cuvier, 1831)

    Ketabi, Ramin; Jamili, Shahla
    Pempheris vanicolensis has reported for the first time from Persian Gulf (Kish Island). Various aspects of the biology of P. vanicolensis Cuvier & Valenciennes, a recent Lessepsian (Suez Canal) immigrant into the Mediterranean, are given. Red Sea and Mediterranean populations were compared, and the results indicate that the spawning season is shortened in the Mediterranean, continuing from April to September, as opposed to year-round in the Red Sea. Descriptions of a ripe ovary and post-larva from the Mediterranean are given. Individuals reach a mean size of 10.8 cm in their first year, and 14.4 cm in the second year. Little change has...

  14. Boloceroides spp.

    Ketabi, Ramin; Jamili, Shahla
    Boloceroides spp. are looking like an untidy mop, this anemone is sometimes seen in sea grass areas on many of our shores. It is possibly seasonal. Sometimes, large numbers are seen (up to 10-20 animals in a trip) and then none at all.  Tiny swimming anemones may sometimes be confused with Sea grass anemones which have translucent tentacles with tiny spots. The swimming anemone harbors symbiotic single-celled algae (zooxanthellae). The algae undergo photosynthesis to produce food from sunlight. The food produced is shared with the sea anemone, which in return provides the algae with shelter and minerals. The oral disk and tentacle muscles...

  15. Koumansetta hectori  Smith, 1957

    Ketabi, Ramin; Jamili, Shahla
    Many aquarists know this fish as Ambylgobius hectori but accepted name is actually Koumansetta hectori. K. hectori, Hector's goby, is a species of goby native to the Indian Ocean (including the Red Sea), first record from Persian Gulf (Kish Island, Iran) to the islands of Micronesia in the western Pacific Ocean. It can be found on sheltered coral reefs at depths of from 3 to 30 meters (though usually between 5 to 20 meters). This species reaches a length of 8.5 centimeters (3.3 in) SL. This attractive little fish measures only 2” at maturity and spends its time hovering over rocks and substrates out in the open water column. Known for their bold yellow stripes, peaceful disposition, the diminutive...

  16. Effect of temperature on genomic and some biological indices during embryonic and larval development of Caspian trout Salmo trutta caspius Kessler, 1877

    Alizadeh Sabet, Hamid Reza
    Since 1966 especially recent decade, Caspian trout (Salmo trutta caspius Kessler, 1877) considered as a strategic endemic species for Caspian Sea fisheries resources also coldwater aquaculture in Iran. Nowadays habitat condition effects on this subspecies during life stages, artificial breeding and incubation period noticed by research and execution sessions of fisheries in Iran. Incubation duration of Caspian trout from artificial fertilization followed by green egg and eyed egg, hatching and yolk sac absorption identified as most sensitive stages for fish and any pollution, stress and deviation by natural life conditions of embryo up to larvae could provide possible mortalities and...

  17. Labroidaes dimidiatus (Valenciennes, 1839)

    Ketabi, Ramin; Jamili, Shahla
    Labroides dimidiatus, is one of several species of cleaner wrasses found on coral reefs from Eastern Africa and the Red Sea to French Polynesia, for the first time from Iran (Persian Gulf, Kish Island). Like other cleaner wrasses, it eats parasites and dead tissue off larger fishes’ skin in a mutualistic relationship that provides food and protection for the wrasse, and considerable health benefits for the other fishes. Some fish mimic cleaner wrasses. For example, a species of blenny called Aspidontus taeniatus has evolved the same behavior to tear small pieces of flesh from bigger fish. Cleaner wrasses are usually found at cleaning stations. Cleaning stations are occupied by different units of cleaner wrasses, such as a group of youths,...

  18. Chrysiptera unimaculata Cuvier, 1830

    Ketabi, Ramin; Jamili, Shahla
    Chrysiptera unimaculata, an algivorous species also living on the coral reef flat and being territorial but not considered as a strict farmer in this location. Maximum length is 8 cm in Persian Gulf. It is living in close association with macrophytes. Adults are found solitarily or in small groups among coastal algal reefs, rubble or over open beach-rock of reef flats exposed to moderate surge and feeds mainly on benthic algae. C. unimaculata is oviparous, distinct pairing during breeding. Eggs are demersal and adhere to the substrate. Males guard and aerate the eggs.

  19. Torpedo sinuspersici  Olfers, 1831

    Ketabi, Ramin; Jamili, Shahla
    Electric rays, thought to be the most primitive of the skates and rays, have stout tails but have rather expansive disc. This group is distinguished by the presence of powerful electric organs, derived from branchial muscles in head region. Torpedo sinuspersici found inshore in sandy bottoms, and well offshore from the surf zone down to 200 m. Also on or near coral reefs (like Kish Island in Persian Gulf). Common in shallow sandy areas. Occasionally hooked by anglers, more often seen by divers; can deliver a strong shock. Flesh is edible. T. sinuspersici can survive for hours after being stranded...

  20. Plotosus lineatus  (Thunberg, 1787)

    Ketabi, Ramin; Jamili, Shahla
    The Striped Catfish can be recognized by its striped coloration, barbels around the mouth, and its body shape which tapers to a point posteriorly. Small juveniles are black and large adults may be less distinctly striped. Plotosus lineatus can reach a maximum length of 32 cm (13 in) and about 40cm in Persian Gulf. The body is brown with cream-colored or white longitudinal bands. The most striking feature of this species is in the fins; in fact the second dorsal, caudal and anal are fused together as in eels. In the rest of the body is quite similar to a...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.