Moshe Gophen

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Vertical distribution of zooplankton (Mesocyclops leuckarti, Bosmina longirostris, Diaphanosoma brachyurum, Ceriodaphnia reticulata, Ceriodaphnia rigaudi and Keratella cochlearis) in Lake Kinneret throughout a yearly cycle showed high concentrations at 5–10 m depths and at metalimnic layer. Upward and downward migrations of copepods and cladocerans were(More)
The appearance of Mesocyclops leuckarti (Claus) in Lake Kinneret was found to be as a population with mixed age structure present throughout the year, when average epilimnic temperatures varied between 14 to 28°C. Some Physiological features were studied, at three temperatures (15, 22, and 27°C), in order to give an insight into such an occurrence: the(More)
In laboratory feeding trials, we analyzed the feeding behavior and selectivity of the cichlid, Sarotherodon galilaeum, for zooplankton prey from Lake Kinneret, Israel. The feeding behavior was dependent on fish size. Fish less than 20 mm SL fed on zooplankton as obligate particulate feeders. Fish from 20 to 42 mm SL fed either as particulate feeders or as(More)
Silver carp Hypophthalmichthys molitrix Val. have been stocked in Lake Kinneret, Israel, since 1969. From 1972 to 1981, 11 × 106 fingerlings were introduced into the lake. Total silver carp catch however was only 642 during this period, resulting in a progressive increase in the silver carp population. Silver carp feed mostly on phytoplankton from February(More)
Monthly averages of standing stock wet biomass of zooplankton in Lake Kinneret (Israel) varied between 11 and 76 g m−2 during 1969–1981, with the exception of two months. Averaged contributions of different groups were: Cladocera 58%, Copepoda 35% and Rotifera 7%. Total standing crop wet biomass is highest during January–June, averages varied between 35 and(More)
Tilapia zillii is a polyphilic, guarding nest spawner which is widespread in west and north Africa and in the Middle East. A study of the nesting and courtship behaviour of this species in Lake Kinneret (Sea of Galilee), revealed that nesting and brood care differ according to the exposure of the nesting site to wave action and the nature of the substrate.(More)
Lake Hula and its surrounding swamps were drained in the 1950s. Forty years later a draw down of groundwater table and peat soils degradation resulted in damage to agricultural crops and increase of nutrient fluxes to the down stream located Lake Kinneret. A reclamation project was implemented, including the construction of the new Lake Agmon wetlands.(More)
Diel vertical migration (DVM) behaviour is a predator avoidance mechanism observed within many zooplankton species in the presence of zooplanktivorous fish. A 24-h survey was carried out in June 1998 to investigate diel variation in the vertical distribution of fish, zooplankton and phytoplankton (chlorophyll) in Lake Kinneret, Israel. Fish revealed diel(More)