Opportunities for the development of seaweed farming as a supplementary income for small-scale fishermen in Nador lagoon: Experimental cultivations of Gracilaria gracilis (Stackhouse)

Year 2019, Volume: 2 Issue: 1, 12 - 26, 30.01.2019

Jawad Kassila , Hassan Nhhala Thierry Givernaud Mahdi Monsouri Azzedine Abrehouch Abdelhakim Mosfioui

Abstract

The development of seaweed farming in Nador lagoon (NE Morocco,
Mediterranean Sea) offers the best hope for raising incomes in fishing
communities. The feasibility of growing red seaweed, Gracilaria
gracilis (Gigartinales, Rhodophyta) in off-bottom and floating
longline systems was investigated in Bouareg location. Several constraints such
as epiphytism and wood borers arose in off-bottom cultures. The weight gains of G. gracilis in off-bottom cultures
tested in winter, were low. The lowest daily growth rate (DGR) was recorded in
sheet-lines (1.91 % day^-1, p < 0.01) while the highest’s RGR
were observed in net-lines and ropes-lines (2.72 and 2.77 % day^-1 respectively, p < 0.01). Plants of G. gracilis grew well in the floating
longline culture tested at spring. The weight growth rates ranged between 2.54
and 4.26 % day^-1. The highest growth
rate in Nador lagoon was observed in treatment stocked with 0.6 kg m^-2. The high stocking density (0.8 kg m^-2) leaded to low growth most probably due
to stress on the seaweed when competing for space and resources. Over a 60-day
cycle, the harvest of G. gracilis cultivated
on floating longline system in Nador lagoon was estimated at about 101 t FWT ha^-1 year^-1.
With 8:1 as wet to dry ratio, the production yield per cropping was estimated
at 3,156 kg (DW) per ha. However, the total sales per year was estimated at
about $ 6,564 per ha. The Gracilaria farming
may provide supplementary income to artisanal farmers in Nador lagoon.   

Keywords

Gracilaria gracilis, culture, Nador lagoon, income

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