In:
European Scientific Journal, ESJ, European Scientific Institute, ESI, Vol. 13, No. 33 ( 2017-11-30), p. 444-
Abstract:
In this study, the seasonal variation in sex ratio, macroscopic stages of sexual maturity, gonado-somatic ratio, hepatostatic ratio, condition factor, and size-weight relationship in Auxis thazard from Gulf of Guinea were studied from January to December 2016. Sex ratio observed was in favor of males (1: 0,78; X² observed = 20,16 ˃ theoretical X² = 3,84 ; p ˂ 0,05). The variation of maturity stages associated with GSI, HSI, and K during different seasons of the year showed that this specie spawns throughout the year. Length-weight relationship was W = 0,0039 L 3, 4108 (R2 = 0,93 ; N = 291) for males, W = 0,0036 L 3, 4376 (R2 = 0,91 ; N = 227) for females, and W = 0,004 L 3, 4118 (R2 = 0,92 ; N = 519) for the combined sexes. The b value was significantly higher than the theoretical value of 3 for males (t-test, t = 233,218, p ˂ 0,05), for females (t-test, t = 227,776, p ˂ 0,05), and for all individuals (t-test, t = 315,821, p ˂ 0,05). This situation however indicates a faster increase of the fish in weight rather than in length.
Type of Medium:
Online Resource
ISSN:
1857-7431
,
1857-7881
DOI:
10.19044/esj.2017.v13n33
DOI:
10.19044/esj.2017.v13n33p444
Language:
Unknown
Publisher:
European Scientific Institute, ESI
Publication Date:
2017
detail.hit.zdb_id:
2648284-8
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