Spawning pattern of the Nematopalaemon hastatus (Crustacea: Palaemonidae) (Aurivilius, 1898), exploited in the artisanal shrimp fishery in the outer Cross River estuary

Ofor, C.O. (2003) Spawning pattern of the Nematopalaemon hastatus (Crustacea: Palaemonidae) (Aurivilius, 1898), exploited in the artisanal shrimp fishery in the outer Cross River estuary. In: 16th Annual Conference of the Fisheries Society of Nigeria (FISON) , 4-9 November 2001 ,Maiduguri, Nigeria, pp. 161-164.

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Abstract

Some aspects of the reproduction of Nematopalaemon hastatus in the artisanal shrimp fishery in the outer Cross River estuary (Nigeria) was investigated. 2 kg samples were taken from the daily catch of the N. hastatus fishery on a twice-weekly basis. The N. hastatus in the sample were then observed for gravidity, using a hand lens, and their post-orbital carapace length (POCL) taken. This was done over a 12-month period. The eggs in formalin-fixed samples showed colour changes from light orange to dark brown with maturation. Gravid females with eggs in different stages of maturation, from light orange to dark brown were observed in the samples. The reproduction occurs all year-round. The proportion of gravid females observed in samples had two distinct peaks in June and November, and two distinct troughs in May and October. The lowest length at which gravidity was observed was 6.0 mm POCL. There were no Penaeus notialis in the samples

Item Type: Conference or Workshop Item
Title: Spawning pattern of the Nematopalaemon hastatus (Crustacea: Palaemonidae) (Aurivilius, 1898), exploited in the artisanal shrimp fishery in the outer Cross River estuary
Personal Creator/Author:
CreatorsEmail
Ofor, C.O.
Page Range: pp. 161-164
Date: 2003
Event Title: 16th Annual Conference of the Fisheries Society of Nigeria (FISON)
Event Type: Conference
Event Location: Maiduguri, Nigeria
Event Dates: 4-9 November 2001
Issuing Agency: Fisheries Society of Nigeria
Uncontrolled Keywords: Nigeria, Cross Estuary, Cross River; artisanal fishing; developmental stages; eggs; estuaries; reproductive cycle; sexual maturity; sexual reproduction; shrimp fisheries; spawning; spawning seasons; Nematopalaemon hastatus
Subjects: Fisheries
Biology
Item ID: 3612
Depositing User: Ms Maria Kalentsits
Date Deposited: 07 Jul 2010 07:15
Last Modified: 29 Sep 2011 17:06
URI: http://aquaticcommons.org/id/eprint/3612

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