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  • Estabelecimento do período de veda da pesca artesanal do camarão penaeideo na Baía de Inhambene

    Uetimane, Avene Eduardo (Instituto Nacional de Investigação PesqueiraMaputo, Mozambique, 2018-03)
    Abstract in english: The study to establish the closure season of artisanal penaeid shrimpp fishing in Inhambane Bay, located in the province with the same name in the south of Mozambique, was carried out between June 2013 and May 2014, covering four fishing pre-defined as shrimp londing sits along Bay.The specimens in total of 100 individuals of each species from each of 2 day sampling period used for this work wereobtained from fishermen using beach seine and it covered the periods of live and dead tide of each month for 12consecutive months. The main objective of this work was to study the reproductive biology aspects and size structure of Fenneropenaeus indicus, with a view to establishing the period for the closure season to protect the artesanal fishery database juveniles shrimp in the Bay of Inhambane.Monthly data extracted from the statistical database of small-scale fishing "Pescart" on fisheries statistics over a series of five consecutive years since 2009, have shown that Fenneropenaeus indicus dominated catches with an average of over 65%. At all sampling sites the shrimp lengths variation was not significant, in spite of a very great abundance in Jogo, followed by Nhaduga. Classes with higher frequency range were between 11 and 18 mm. Therefore, it can be hypothesized that juveniles of Fenneropenaeus indicusin the Bay of Inhambane do not remain for a long time in this area. Population structure of the studied species indicated that the amplitude of the variation of the carapace length of the females was between the classes 5 and 29 mm, with molting in classes 10 and 15 mm and with an average value of 15.8 mm while males ranged from 5 to 28 mm with an average value of 15.1 mm.In conclusion the closure season may be stablished for the entire Inhambane Bay, system from October to February, toenable juveniles shrimp to enter the fishing ground, to grow and reach the fishing size to produce sustainable amounts of spawning stock.Abstract in portuguese:O estudo para o estabelecimento do período de veda da pesca artesanal de camarão penaeideo na Baía de Inhambane, província do mesmo nome a sul de Moçambique, foi realizado entre Junho de 2013 e Maio de 2014, abarcando quatro centros de pesca ao longo da Baía, que foram pré-definidos como locais de captura/desembarque de camarão na área de estudo. A obtenção dos espécimens para o trabalho foi feita mediante a aquisição aos pescadores das redes de arrasto para a praia até perfazer um total de 100 indivíduos de cada espécie em cada um dos 2 dias de amostragem, cobrindo períodos de maré viva e morta de cada mês durante 12 meses consecutivos. O objectivo consistiu em estudar aspectos da biologia reprodutiva e estrutura de tamanhos camarão branco (Fenneropenaeus indicus), com vista ao estabelecimento do período de veda para a protecção de juvenis na Baía de Inhambane.Dados mensais extraídos na base de dados da pesca artesanal “Pescart”, ao longo de uma série de cinco anos consecutivos desde 2009, mostraram que Fenneropenaeus indicus dominou as capturas com uma média de mais de 65%. Em todos os locais de amostragem a variação dos comprimentos não foi significante, apesar de se verificar uma abundância muito grande em Jogo, seguida de Nhaduga. As classes com maior frequência estão compreendidas entre 11 e 18 mm, pelo que se pode colocar a hipótese de que os juvenis de Fenneropenaeus indicus na Baía de Inhambane não permanecem durante muito tempo nesta área. A estrutura da população da espécie estudada mostra, que a amplitude da variação do comprimento de carapaça das fêmeas situa-se entre as classes 5 e 29 mm, com modas nas classes 10 e 15 mm e com um valor médio de 15,8 mm enquanto que os machos variam de 5 a 28 mm com um valor médio de 15,1 mm.O período de veda poderá ser definido para toda a Baía de Inhambane a ser implementada a partir do mês de Outubro aFevereiro, para possibilitar que camarão pequeno que dá entrada nesta área de pesca possa crescer e atingir tamanhomaior e produzir quantidades sustentáveis de stock desovante.
  • Teste da eficácia de uma ração comercial de frango para alimentar Tilápia nilótica em tanques de betão em Moçambique

    Murama, José; Malichocho, Celina; Muiocha, Delfina (Instituto Nacional de Investigação PesqueiraMaputo, Mozambique, 2015-10)
    O presente estudo teve como objectivo avaliar a taxa de crescimento dos alevinos revertidos de peixe tilapia nilótica Oreochromis niloticus ou Tilapia nilotica alimentados com a ração do Higest® que é peletizada e apresenta um nível proteico de 30%, sendo uma ração comercial e amplamente disponível em Moçambique mas formulada para frangos.Para efeitos de controlo, foi usada a ração AQUA-plus® que é uma ração extrusada que contém 45% de proteína típicapara peixes e importada da Africa do Sul. O estudo foi conduzido no Laboratório de Pré-testagem do Instituto deInvestigação Pesqueira em Maputo. O aparato experimental era composto por seis tanques rectangulares de betão com3 capacidade de 600 m cada sendo três tanques para o tratamento e outros três para controlo. No período de 91 dias (16 de Agosto a 14 de Novembro de 2013) foram povoados em cada tanque 91 alevinos de Tilapia niloticus cujo peso ecomprimento médio total no início era de 0,68±0,29 g e 3,25±0,48cm respectivamente. O crescimento foiacompanhado por meio de biometrias quinzenais. Diariamente eram monitorados parâmetros físico-químicos da água.As variáveis físico-químicas nos tanques, não apresentaram diferença significativa (P> 0,05), água apresentoucondições limnológicas razoáveis para o crescimento do peixe, com excepção da temperatura que se apresentava baixao com 21,82 C e o oxigénio dissolvido que esteve em torno de 3,14 ± 0,17 mg/L. Os peixes alimentados com a ração decontrolo da AQUA– Plus® obteve relativamente um maior ganho de peso (5,02 ± 0,97 g) e comprimento (3,30 ± 1,32cm) e melhor índice de conversão alimentar (0,33 ± 0,77) em comparação com a ração experimental da Highest® cujoíndice de conversão foi de 0,38 ± 0,85. Os resultados demonstram a necessidade de alimentar alevinos de tilapia com uma dieta formulada para atender as exigências nutricionais específicas de peixes. Desta forma, não se recomenda o uso da ração Higest®, de frangos para alimentar peixes.
  • A preliminary assessment of the scad and mackerel stocks at Sofala Bank, Mozambique

    Borges, F.; Gislason, H.; Sousa, M.I. (1984)
    Scads (Decapterus russellii, D. macrosoma, Selar crumenophthalmus), Indian mackerel (Rastrelliger kanagurta) and horse mackerel (Trachurus trachurus) are the main pelagic species caught in a bottom trawl fishery at Sofala Bank and at Boa Paz. Information on catch and effort is presented together with available data on distribution, spawning, size at first maturity, growth, mortality and biomass of the species. As the present catch and fishing mortality are low compared to the estimates of biomass and total mortality it is concluded that the fishery may be expanded further in the future.
  • Hydrology and fish distribution at the Sofala Bank (Mozambique)

    Da Silva, A.J. (1984)
    A brief review is made of the hydrologic conditions at the Sofala Bank, mainly based on the research data obtained from 1978 to 1982. A description is attempted of the circulation pattern and the distribution of water masses in the area, four hydrologic regimes being identified. These are compared with the distributions of different pelagic and demersal fish species. A tendency is found for different groups of species to prefer different hydrologic regimes.
  • A study on growth of Metapenaeus monoceros (Fabricius) of Maputo Bay

    Brinca, L.; Palha De Sousa, L. (1984)
    Biological data on Metapenaeus monoceros has been regularly collected in Maputo Bay since 1968. The main objective of this report is to study growth as a function of the size, since this is one of the basic parameters for population dynamics. As the possibility of studying shrimp growth by modal progression analysis depends very much on the space-time configuration of sampling, the years 1968 and 1969 were chosen to study growth of the population available to the bottom trawl used by the fishing industry. In those years sampling was very frequent (twice a week) and the samples were collected from a rather small fishing area. Complementary data on the spawning, juvenile phase and recruitment to the fishery was used to establish the relationship between the different stages of the life cycle and to obtain an age/length key. Data on juveniles in estuaries was only available for 1969 and 1973.
  • Circulation system and areas of potentially successful tuna fishing with surface methods off Mozambique

    Da Silva, A.J. (1984)
    Charts with 3-months running means of thermal data collected during 1977-1982 are used to describe the seasonal variability of the circulation pattern off Mozambique, and to identify the areas of tuna vulnerability to surface gears. The main conclusions reached by Sætre and Jorge da Silva (1984) have received further support. Areas of potentially successful exploitation of tunas by surface methods have been identified during the whole year, with emphasis for November-April.
  • Mortality rates estimates for Metapenaeus monoceros (Fabricius) of Maputo Bay

    Brinca, L.; Palha De Sousa, L. (1984)
    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.
  • Relatório do cruzeiro realizado no Banco de Sofala pelo navio SRTM "Sebastopolsky rybak" de Novembro a Dezembro de 1982: camarāo de águas pouco profundas

    Mascarenhas, V.; Brinca, L. (1984)
    From November 18th to December 17th 1982, the SRTM "Sebastopolsky Rybak" carried out research cruises on the Sofala Bank in the area between 16°20'S and parallel 19°40'S. The authors analyze data collected on biological characteristics, sexual maturity and localization of Penaeus indicus, Metapenaeus monoceros, Penaeus japonicus, Penaeus monodon and Penaeus latisulcatus.
  • Relatório do cruzeiro realizado no Banco de Sofala pelo navio SRTM "Sebastopolsky ribak" de Setembro a Outubro de 1982: camarāo de águas pouco profundas

    Mascarenhas, V.; Brinca, L. (1984)
    In September-October 1982, the Soviet ship "Sebastopolsky Rybak" conducted a cruise on the Sofala Bank in the area between 16°20'S and parallel 19°40'S. Two surveys were made, one from South to North (depth 10-110 meters) and vice versa. The type of coverage used was systematic. The Sofala Bank was divided into seven sub-areas. During this cruise sub-areas 3 and 4 were covered. Sub-area 5 has not been fully covered.
  • Camparaçāo entre os cruzeiros de investigaçāo realizados no Banco de Sofala pelo navio SRTM "Sebastopolsky rybak" em Setembro-Outubro e Novembro-Dezembro de 1982: camarao de [águas pouco profundas]

    Mascarenhas, V.; Brinca, L. (1984)
    During the last 4 months of 1982, two research cruises had been carried out at the Sofala Bank by the SRTM"Sevastopolsky Rybak". The authors analyze and compare data on biological characteristics, sexual maturity and localization of Penaeus indicus and Metapenaeus monoceros.
  • Report on the oceanographic investigations carried out at the Sofala Bank by the Soviet trawler "Sevastopolsky rybak" in September-December 1982

    Da Silva, A.J. (1984)
    In September-December 1982 a fisheries research cruise was carried out at the Sofala Bank by the SRTM "Sevastopolsky Rybak". Oceanographic investigations have been conducted in association with the fisheries research. Three coverages were made of the Sofala Bank each lasting for slightly less than three weeks. This will allow for three descriptions of the oceanographic conditions in the area, with some reference being made to variability. This paper is just a preliminary report of those investigations.
  • Os problemas encontrados no desenvolvimento e planeamento das pescas em Moçambique

    David e Silva, F. (1984)
    The author outlines the role of fisheries in the national economy of Mozambique and describes the way in which the objectives of fishery development reflect the aims of development in the economy. The history of the country is described and the steps to increase the fishery sector are detailed with a presentation of problems encountered.
  • Relatório do cruzeiro realizado no Banco de Sofala pelo navio Pantikapey em Julho-Agosto de [1981]: peixes demersais

    Timochin, I. (1984)
    Thanks to an agreement between the Institute of Fisheries Research of Mozambique and the Soviet part Azcherniro and Ingribpomrazvedka, surveys in the waters of Mozambique were conducted from June to August 1981 on the ship Pantikapei. The survey made along the Sofala Bank and Boa Paz (16°00-21°00'S) was at a depths of 11 and 90 meters. Demersal and pelagic fisheries experiments were conducted using acoustic devices. This paper described the results obtained on demersal fishery resources.
  • Ensaio sobre a forma de comunicaçāo dos resultados da investigaçāo de recursos pesqueiros à administraçāo pesqueira. Tema 1: Síntese dos resultados e métodos de análise utilizado na avaliaçāo do recurso de camarao de águas pouco profundas do Banco de Sofala.

    Brinca, L.; Santos, E. (1984)
    The main goal of this paper is to provide samples of fishing methods analyses applied to studies on shrimps stock assessment in the Sofala Bank. Especially the authors provide the administrators with the main limits of application of described methods.
  • Investigaçāo, gestāo e planifiçāo pesqueiras

    Saetersdal, G. (1984)
    The paper deals with the main objectives and functions of research, management and fisheries planning, as well as their correlation and organization. Several aspects of general application and more specific issues of fisheries research are stressed. The author provides a perspective of the fishing sector in Mozambique, using for this purpose regional and global comparisons. Some brief comments on current tasks for fisheries research in Mozambique are given.
  • Avaliaçāo do estado dum recurso e da pesca

    Cadima, E.L. (1984)
    One of the key sectors of fisheries research is assessment and exploration which should have as main goal the support to the fishing industry: analyzing the effects of fishing on stocks, determining the potential stock to be exploited and the formulation of rules for an appropriate exploitation and preservation of resources. In this paper the author intends to analyze some aspects of the investigation in support to fishery management.
  • Aquacultura de mexilhão marinho Perna-perna (L.)

    Ribeiro, F. (1984)
    The Mozambican experimental project on mussel culture began in 1977 to promote cheap food production with high protein value for domestic market. The species Perna perna (L.) has been selected due to its abundance, sustainable culture processes and better yields.
  • Peixes demersais: águas marinhas

    Timochin, I.; Palha de Sousa, B. (1984)
    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.
  • Revisão dos conhecimentos sobre os recursos pesqueiros marinhos de Moçambique

    Sætre, R. (1984)
    A marine fish resources first assessment of Mozambique was made in 1979 (Sætre and Paula e Silva, 1979). Up to now, information on resources has increased significantly as result of the work done by the IIP’s technicians. A brief review of data is given.
  • Outros recursos marinhos

    De Paula e Silva, R. (1984)
    The paper describes marine fish resources living in Mozambican waters. Resource data on distribution areas, reproduction, age, growth and stock size are described. Actual price of the commercially exploited stocks are also given. The problems involving the assessment of catch areas are discussed.

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