Movilidad del cangrejo ermitaño Clibanarius aequabilis (Decapada: Anomura) en función de la temperatura

[ES] Se describe el efecto de la temperatura en la movilidad (medida como distancia recorrida) del cangrejo ermitaño Clibanarius aequabilis. Se observa que el nivel de movilidad aumenta a medida que la temperatura pasa de 18 ºC a 20 ºC, pero desciende cuando la temperatura se incrementa hasta los 22 ºC.

Efecto de la temperatura en la motivación del cangrejo ermitaño "Clibanarius aequabilis" en la alimentación y cambio de concha

[ES] Se describe el efecto de la temperatura en la motivación (medida como el tiempo invertido), tanto en acciones de alimentación como de cambio de concha, en el cangrejo ermitaño Clibanarius aequabilis. A temperaturas altas (27 ºC) el tiempo que emplean los animales para aproximarse al alimento o para realizar un cambio de concha aumenta de forma significativa en relación al invertido a 20 ºC.

An evaluation of mark and recapture techniques for estimating tigerfish biomass in Lake Kariba

The effectiveness of 2 mark and recapture techniques was evaluated using tiger fish, Hydrocynus vittatus. The 2 techniques used were: tagging with a plastic tag and fluorescent spray marking. While the tagging method resulted as the logical method to use within the constraints of the tiger fish study, it cannot be considered completely reliable for the estimation of population size in Lake Kariba.

Report on the 1980/81 angling census in the Sanyati Gorge, Lake Kariba

The angling census carried out in the Sanyati Gorge, August 1980 - March 1981, is reported. The results are compared to those obtained in the 1973 census. The objectives of the census were: 1) to determine the extent of angling mortality on tigerfish (Hydrocynus vittatus) thereby quantifying this previously neglected component of total mortality; and 2) to assess the economic importance of tigerfish to the recreational fishery on Lake Kariba.

A re-examination of tigerfish growth rates in Lake Kariba

Growth rates of male and female tigerfish Hydrocynus vittatus were determined from length/frequencies of fish from the Sanyati Basin and Sinamwenda estuary, Lake Kariba. Growth rates were similar in both sexes for the first two years, after which females grew faster and reached a greater length. Fish from the Sanyati Basin appeared to grow slightly faster than those from the Sinamwenda Estuary.

Annual report 1992

An account is given of the activities conducted by the Lake Kariba Fisheries Research Institute during the year 1992, which include the following research programmes: Comparative study of growth of Limnothrissa miodon (Boulanger) in Lake Kariba; Effort calibration for the Kapenta fishery; Pre-recruitment ecology of the freshwater sardine L.miodon (Boulanger) in Lake Kariba; The ecology of the inshore fishery of Lake Kariba - biology of Synodontis zambezensis; Mercury in the tigerfish (Hydrocynus vittatus), green happy (Serranochromis codringtoni) and Tanganyika sardine (L.miodon) from Lake Kariba, Zimbabwe; and, Assessment of the potential development of a Synodontis fishery on Lake Kariba, Zimbabwe.

1981 fisheries statistics, Lake Kariba - Zimbabwe waters

The 1981 statistics of the open water fishery (sardine, Limnothrissa miodon , and tigerfish, Hydrocynus vittatus) and inshore fishery (cichlids, labeoa, mainly L. altivelis , distichoclids, mainly Distichodus schenga , tigerfish, H. vittatus , mormyrids, mainly Mormyrus longirostris and M. deliciosus , and catfish, Clarias gariepinus) in Lake Kariba are presented.

1994 fisheries statistics, Lake Kariba - Zimbabwe shore

The report provides catch records for the Kapenta and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1994. Kapenta usually constitute about 90% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. Whereas kapenta represent a unit stock which is harvested by both Zimbabwe and Zambia, the artisanal fishery exploits inshore species which generally occupy water less than 10m deep along the shoreline, considered to be 2 separate stocks. The main species in the inshore fishery are Oreochromis mortimeri, Sargochromis codringtonii, Tilapia rendalli, Labeo altivelis, Hydrocynus vittatus, Mormyrus longirostris, Clarias gariepinus and Synodontis zambezensis.

1995 fisheries statistics, Lake Kariba - Zimbabwe shore

The report provides catch records for the Kapenta and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1995. Kapenta usually constitute about 90% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. Whereas kapenta represent a unit stock which is harvested by both Zimbabwe and Zambia, the artisanal fishery exploits inshore species which generally occupy water less than 10m deep along the shoreline, considered to be 2 separate stocks. The main species in the inshore fishery are Oreochromis mortimeri, Sargochromis codringtonii, Tilapia rendalli, Labeo altivelis, Hydrocynus vittatus, Mormyrus longirostris, Clarias gariepinus and Synodontis zambezensis.

1996 fisheries statistics, Lake Kariba - Zimbabwe shore

The report provides catch records for the Kapenta and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1996. Kapenta usually constitute about 90% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. Whereas kapenta represent a unit stock which is harvested by both Zimbabwe and Zambia, the artisanal fishery exploits inshore species which generally occupy water less than 10m deep along the shoreline, considered to be 2 separate stocks. The main species in the inshore fishery are Oreochromis mortimeri, Sargochromis codringtonii, Tilapia rendalli, Labeo altivelis, Hydrocynus vittatus, Mormyrus longirostris, Clarias gariepinus and Synodontis zambezensis.

1997 fisheries statistics, Lake Kariba - Zimbabwe shore

The report provides catch records for the kapenta (Limnothrissa miodon) and inshore fisheries in the Zimbabwean waters of Lake Kariba for the year 1997. Kapenta usually constitute about 94% of the total catch from Lake Kariba; for statistical purposes catches are recorded for the 5 hydrological basins - Mlibizi, Binga, Sengwa, Bumi and Kariba. The kapenta, which occupy the open pelagic waters of the lake, represent a unit stock which is harvested by both Zimbabwe and Zambia; the artisanal fishery exploits inshore species which generally occupy water less than 10m deep along the shoreline. The Zambian and Zimbabwean inshore fisheries may therefore be considered to be exploiting 2 separate stocks. The main species in the inshore fishery are Oreochromis mortimeri, Sargochromis codringtonii, Tilapia rendalli, Labeo altivelis, Hydrocynus vittatus, Mormyrus longirostris, M.anguilloides and Clarias gariepinus.

Morphological overlap of fish community in Vamanapuram River, south Kerala

The morphological characteristics and overlap of fish community in Vamanapuram River have been studied in detail. In the 12 study sites, 19 fish species were encountered. Based on the body shape, four different types are apparent. The elongate bodied fishes (RBD<1.5) like Hemiramphus xanthopterus and Xenentodon cancila are grouped under one category. The deep bodied fishes (RBD>3.5) like Puntius filamentosus, P. ticto, P. vittatus, P. melanampyx, P. sarana, Etroplus maculatus and E. suratensis come under a separate category. Fishes with round to square cross section like Garra mullya and Glossogobius giuris form a separate group. All the other species are grouped as generalized bodied fishes. The morphological overlap studied for the Vamanapuram fish community showed that out of 190 combinations, 30 combinations have high overlaps (≥ 67). P. melanampyx has maximum number (6) of high overlaps. Puntius spp., which constituted 49.5% of the total population, have a mean morphological overlap of 52%. The morphological overlap of fish species in relation to the trophic structure is discussed in detail.