Reproduction, age and growth of the kelee shad, Hilsa kelee (Cuvier, 1829) (pisces: fam. Clupeidae) with informations on its fishery in Maputo Bay, Mozambique

Age, growth and reproduction of H. kelee were studied, and a brief description of its fishery in Maputo Bay (Mozambique) is given. Most material was collected from gill net fisheries during 1977-1980, but some was taken from shrimp trawlers operating in the same area during 1980-1981. Main spawning takes place during October-January with a peak in December. There is also some evidence that spawning takes place during June-July. The size at first maturity was approximately equals 14-15 cm. Ageing was carried out using primary growth rings in the otoliths and length-frequency analysis of fish caught by shrimp trawlers. Von Bertalanffy's growth equation parameters were determined. Males and females grew in similar fashion. There are seasonal trends in the catch composition of the gill net fishery, showing high values during April to September and low during October to December.

Reproduction, age and growth of the Russell's scad, Decapterus russellii (Rüppel, 1828)(Carangidae) from Sofala Bank, Mozambique

Age, growth and reproduction of D. russellii were studied. Most of the material used was caught by the commercial fishing fleet, operating in the Sofala Bank (Mozambique) area. A total of 68,000 fish were examined during the period 1979-1981. There were 2 main spawning periods each year, one in February-March and another in August-September. The sex ratio was about 1:1. Ageing was carried out using primary growth rings in the otoliths and analysis of size-frequency distributions. The parameters of the von Bertalanffy's growth equation were determined. Males and females grew at the same rate.

A pesca do atum no Oceano Indico do sudoeste

The tuna species of greatest interest to the countries of the southwest region of Indian Ocean are described. They are called mermas, small "coastal tunas". These fishes need a lot of food and oxygen, but have a limited tolerance for temperature variations. These are features commonly used in determining the possible areas of occurrence and also the most suitable type of fishing gear.

Recursos de atum nas águas de Moçambique

From 1976 to 1979 tunas of Mozambique were studied for about 40 months using seven research vessels. The main purpose of survey was not to study these resources therefore part of the information is poor and incomplete. During these three years, there were about fourteen months for experimental logline fisheries of deep-water tunas. This work corresponds to a bilateral cooperation program with USSR.

A lagosta de profundidade Palinurus delagoae da costa de Moçambique

Catch and effort data and some biological characteristics of the deep water spiny lobster P. delagoae were presented.

O recurso de camarāo de águas pouco profundas

The shallow-water shrimp lives along the coast of Mozambique. Its distribution is closely linked to the existence of mangroves, where it grows during the first months of life. The adult population live in the bays or offshore, in shallow waters. A description of resource distribution, fishing areas and catch composition is given.

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.

Pequenos peixes pelágicos

The paper describes small pelagic fishes including several marine resources ranked among the most important in abundance(anchovy, horse mackerel and sardines) off the coast of Mozambique.

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.

Aquacultura de mexilhão marinho Perna-perna (L.)

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.

Outros recursos marinhos

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.

Revisão dos conhecimentos sobre os recursos pesqueiros marinhos de Moçambique

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.

Avaliaçāo do estado dum recurso e da pesca

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.

Investigaçāo, gestāo e planifiçāo pesqueiras

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.

Os problemas encontrados no desenvolvimento e planeamento das pescas em Moçambique

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.