Relatorio do cruzeiro realizado no Banco de Sofala pelo arrastao Muleve em Julho-Agosto/1979

In July-August 1979 a first survey of Sofala Bank was carried out with shallow water prawn resources as the main objective. Some preliminary conclusions on the circulation in the Sofala Bank and the influence of the Zambezi River in this area were drawn. Analysis of catch rates and distribution of the different prawn species resulted in the division of Sofala Bank in 6 areas. Particular importance is given to the species Penaeus indicus and Metapenaeus monoceros which constitute 70-90% of catches in depths less than 25 m. The greatest concentrations of P. indicus are found very close to the shore, principally in an area north of Quelimane and another south of Angoche. At the time of the survey 40% of females of this species were in late maturing stages. The species M. monoceros is most abundant in depths greater than 15 m, with concentrations south of Zambezi River and in small areas near Pebane and Angoche.

Pescaria de camarāo e gestāo: alguns exemplos de experiências de outras áreas

In volume 60 of the FAO Statistical Yearbook of Fisheries, we can see that the world shrimp catch in 1985 was 1.9 million tons. This represents an increase, since 1980, of 250 tons (15%). Catches of shrimp is about 2.5% of global marine fishery products. But as we know, its economic value in the global market is much higher, reaching a value of 30%.

Problemas da gestāo dos stocks de camarāo

The worldwide shrimp landings in 1988 were reported to be 2.484.000 tons an increase of about 460.000 tons compared with 1985. The majority of shrimp fishing areas located in the tropical and sub-tropical regions with a contribution of more than 2 million tone. The most important species are the shallow water Penaeid shrimps. This quantity of about 2.5 million tons represents approximately 3% of the world marine catch. In terms of value, it represents almost 30% of the world trade in fish products. Main management objectives include: long term resources conservation; to maximize physical catches; to maximize the total income from catches or foreign exchange; to maximize economic profits; to reduce the shrimp by catch or improve its utilization; other social and economic interests. These objectives are in part interconnected and some are in conflict. Resource conservation is a basic condition for all other management objectives. Management policy definition should be in accordance with national goals and based on available scientific knowledge of the resources and of the fishing industry. The definition and selection of management objectives is an important process, to which the scientists must contribute the best way they can, mainly in providing the necessary information and options for management.

Population dynamics of Penaeus indicus at Sofala Bank, Mozambique: a preliminary study

Length-based methods are used to estimate growth and mortalities of Penaeus indicus at Sofala Bank in Mozambique. This Penaeid shrimp is one of the most important species in the fishery as it constitutes 45% of the catches and has a great influence in their trend. First estimates of growth parameters for this species in Mozambique are presented and a comparison of the derived mortalities with the previous estimates is made.

Stock assessment of Haliporoides triarthrus (Fam. Solenoceridae) off Mozambique: a preliminary analysis

The pink shrimp, Haliporoides triarthrus, is an important species in the deep-water shrimp fishery in Mozambique. Total catches are in the range of 1,500 to 2,700 tons, with the pink shrimp accounting for 70-90%. Estimates of growth parameters and of natural mortality are used for a preliminary assessment of the fishery, based on length-structured virtual population analysis and yield-per-recruit analyses. With an arbitrarily chosen terminal fishing mortality F, the results indicate a situation of overfishing, but realistic parameters must be acquired in order to diagnose the state of the stock

The history and fishery potential of Kisoro Minor Lakes part two: Preliminary survey of Lakes Mutanda and Mulehe fisheries 

The fisheries of Lakes Mutanda and Mulehe during 1998/9 were mainly at subsistence scale and only few fishers operated at irregular intervals. The commercial catch records between 1963 to 1999 showed that Lake Mulehe was landing more fish than Lake Mutanda despite the fact that Lake Mutanda (26.4 km2) was bigger than Lake Mulehe (4.11 cm2). The constant decline of catches was due to irregular restocking and applying low stocking densities of fry. However, restocking should consider using species that withstand low temperature (15-240C) in the district. These include Oreochromis niloticus (Nile tilapia), Macropterus salmoides (Black bass), and Cyprinus carpio (Common carp). Most of these species have either disappeared or declined to very low levels. Due to lack of commercial fish species for harvest, the fishers by 1998/9 resorted to harvesting the haplochromines, Clarias carsoni and edible frogs (Xenopus kigesiensis) as alternative resources. Experimental studies have shown the need and techniques to enhance fish production on these two lakes.

Recolha de camarões reprodutores vivos da espécie Fenneropenaeus indicus da pesca de arrasto semi-industrial na Baía de Maputo

The collection of wild breeders of the Indian white prawn Fenneropenaeus indicus from two semi-industrial trawlers fishing in Maputo Bay is assessed for the period between August and November 1993. The daily mean catch (12-21 prawns dayˉ¹) increased until October but monthly yields were not significantly different (P>0.05). The monthly mean mortality ranged between 8% and 20% and was similar for males and females. More than 70% of the catch comprised small (grade B1: 20-39 g) and medium size (grade B2: 40-59 g) prawns. While males were exclusively of grade B1 (99%), the females were predominantly of grades B2 and B3 (60-80 g). The collection of larger breeders (grade B4: >80 g) was low and represented only 1% of total catches and a maximum of 3% of females. The net profit of breeders collection increased with size (grade) of prawns, and represented a maximum yield of 114% for grade B3. The added value of live prawns exceeded 450% of the cost to the fisherman, but decreased with size of breeders. It is considered that the semi-industrial trawling fishery operating in Maputo Bay has potential for supplying wild breeders of the Indian white prawn for aquaculture. This activity can also contribute to value adding of part of the catch traditionally destined for human consumption.

The past, present and projected scenarios in the Lake AIbert and Albert Nile fisheries: implications for sustainable management

Lake Albert is one of the largest lakes in Uganda that still supports a multi-species fishery which as a result of variable adult sizes of the species, causes management challenges especially in relation to gear mesh size enforcement. Prior to the 1980s, commercial species were 17 largesized fishes especially Citharinus citharinus, Distichodus niloticus and Lates spp. that were confmed to inshore habitats of the lake and were thus rapidly over fished. Frame and catch assessment surveys conducted in this study revealed a >80% dominance of small size fish species (Neobola bredoi and Brycinus nurse) and a 40 -60% decrease in the contribution of the large commercial species. Sustainability of small size fish species is uncertain due to seasonal fluctuations and low beach value. At about 150,000 tons of fish recorded from Lake Albert and Albert Nile, the beach value was estimated at 55.3 million USD. Despite the noted decline in catches of the large sized fishes their contribution was more than 50% of total beach value. Therefore, management measures should couple value addition for the small sized species and maintain effort regulation targeting recovery of the large previously important commercial species

East African Fisheries Research Organization Annual Report 1954/1955

This Report covers the period 1st January, 1954, to 30th June, 1955. Scientific work of the organization carried out during the reporting period included the following: Hydrology, Mollusca, Arthropoda , Tilapia, Haplochromis , The Fishes of Uganda , species of fish occurring in Lake Victoria, Analysis of commercial catches, Experimental fishing, The Relative fecundity of Tilapia species, The breeding behaviour of Tilapia, The rings on Tilapia Scales, The Growth of very young fish, The reproductive cycle of non-cichild fishes, The food of fish, some notes on the food of crocodiles, Varanus Lizards and Otters and List of Publications

Camarāo de profundidade: relatório dos cruzeiros realizados com o n/i "Ernst Haeckel" em Agosto-Setembro 1980, Novembro-Dezembro 1980, Janeiro-Fevereiro 1981, Janeiro-Fevereiro 1982

Reports of cruises carried out off Mozambique between parallels 21 degree 00 and 26 degree 20'S and at depths of 400 and 800 meters including abundance indices, catch composition, geographic and bathymetric distributions of shrimp catches are presented. The main species found were Hymenopenaeus triarthrus and Aristeomorpha foliacea which represent 64 to 72% of total catches.

Informaçāo geral sobre o manancial de camarāo de profundidade e a sua exploraçāo nas águas da República Popular de Moçambique

The deep-water shrimp were already studied many years ago, but their commercial fishing on large scale, only developed from the seventies. Two Luso-U.S. fishing companies (1966), and a Luso-South African company (1963- 1968), dedicated to the fishing of deep-water crustaceans, including Haliporoides triarthrus species (Araújo, 1973). Also Champion (1973) described commercial catches of Plesiopenaeus edwardsianus, Aristaeomorpha foliacea and Haliporoides triarthrus in the waters of Mozambique. The first Spanish vessels began fishing activity in 1968 (Freitas and Araújo, 1973) but all of these companies captured mainly penaideos on the continental shelf.

Peixes demersais: águas marinhas

This paper deals with demersal fish. The authors described the characteristics of species composition, biology, distribution of catches by area and depth. They also provided the biomass of two main fishing areas: Boa Paz and Sofala Banks.

Environmental and social impact monitoring of the Bujagali Hydropower Project (BHPP), Uganda Fisheries Component: monthly patterns in physico-chemical conditions and fish catch in the immediate vicinity of the Bujagali Hydropower construction site, 29th September - 28th October 2007

Following the commencement of construction works of a 250 MW hydropower plant at Dumbbell Island in the Upper Victoria Nile in September 2007, BEL requested NaFIRRI to conduct continuous monitoring of fish catches at two transects i.e. the immediate upstream transect of the project site (Kalange-Makwanzi) and the immediate downstream .transect (Buyala-Kikubamutwe). The routine monitoring surveys were designed to be conducted twice a week at each of the tWo transects. It was anticipated that major immediate impacts were to occur during construction, and these needed to be known by BEL as part of a mitigation strategy. For example, the construction of it cofferdam could be accompanied by rapid changes in water quality and quantity downstream of the construction. These changes in turn could affect the fish catch and would probably be missed by the quarterly monitoring already in place. Therefore, a major cbjective of the more regular and rapid monitoring was to discern immediate impacts of construction activities by focusing on selected water quality parameters (total suspended solids, water conductivity, temperature, dissolved oxygen and pH) and fish catch characteristics (total catch, catch rates and value of the catch)

Mortality rates estimates for Metapenaeus monoceros (Fabricius) of Maputo Bay

The species Metapenaeus monoceros in Maputo Bay recruits to the fishery almost all over the year, but the main recruitment occurs over a short period of time, each year, during April-May. Growth curves were constructed by following the progression of modes over a period of time. The von Bertalanffy growth parameters were estimated as L∞=31.9 mm and K(monthly)=0.25, for males, and L∞=48.3 mm and K(monthly)=0.14, for females (Brinca and Sousa, 1984). Using data on growth and length composition of the catches, the following methods were applied to estimate mortality rates of M. monoceros: estimation of natural mortality by using approximative methods; use of c.p.u.e. data; catch curves; cohort analysis; average age and length methods.

Monitoring of the socio-economics status of fisher communties on Lake Victoria, Uganda

The objectives of the study was to provide information on the changes in the socio- economis status of the fisher communities.The study aimed at contributing to the following selected OVIs of the IFMP log frame:"10% increased in incomes from fish catches by fishing crews by EOP",20% women in BMUs reporting increased household incomefrom fishing by EOP","50% women and fishing crews in BMUs reporting greater say in fisheries decision making.