Length–weight relationship of 39 selected reef fishes in the Kenyan coastal artisanal fishery

Mbaru, Emmanuel K.; Mlewa, Chrisestom M.; Kimani, Edward

doi:10.1016/j.fishres.2010.09.012

Cited by 24 publications

(11 citation statements)

References 5 publications

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“…Wambiji et al (2008) and also Agembe et al (2010) report higher condition factor of 0.9 to 1.2 for Siganids captured using basket trap and other gears, in the south coast of Kenya. On the other hand, Mbaru et al (2010) report condition factors of 0.01 to 0.4 for L. lentjan and L. fulviflamma caught using nets, which are lower than values reported here. Nandikeswan and Ananda (2013) report GSI of over 4.0 in Terapon puta from Asia, which is higher than levels reported here.…”

Section: Discussioncontrasting

confidence: 98%

“…Fish condition and GSI have been shown to vary with season, diet and fish shape (Nash et al, 2006). Condition factor of 0.2 to 1.2 have been recorded with values close to or above unity, representing fish with superior condition (Agembe et al, 2010;Al-Zibdah and Kan'an, 2009;Mbaru et al, 2010). Depending on fish species and sex, GSI cutoff of between 1 to 10% have been suggested to indicate mature adults (Al-Zibdad and Kan'an, 2009; Kreiner et al, 2001;Zeyl et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya

Maina¹,

Yvone²,

Muthumbi³

et al. 2015

Int. J. Fish. Aquac.

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Although artisanal commercial and net fishers landings has received attention, the morphometrics of bait fisher landings is poorly documented. This is in spite of the importance of such data to infer fished stock growth and developmental status in order to reduce excessive removal of immature and highly fecund fish. This study compares fish species, size and weight, and derived fish condition, Gonadosomatic and Fishing Indices, between hook and line gear baited with polychaetes and hermit crabs, and traps baited with gastropods. Results indicate fishers land over 20 fish types with similar condition and GSI below unity and fishing index of below 20%. Variation in growth indicators was largely attributed to species specific differences, with high value apex predators, such as carangidae, having lower morphometrics than smaller bodied permanent creek and mangrove residents. Participatory effort controls through closure, alternative livelihoods, and voluntary release of immature, coupled with limiting the use of small mesh traps and hooks, may reduce harvesting of immature and lead to improvement of future landings and sustainability of the fishery.

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Section: Discussioncontrasting

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya

Maina¹,

Yvone²,

Muthumbi³

et al. 2015

Int. J. Fish. Aquac.

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Section: Shape Variation and Developmental Patternmentioning

confidence: 99%

“…Lutjanidae family have both positive and negative allometric development [48] [49]. Mbaru et al [48], Gómez et al [50] and Manickchand-Heileman & Phillip [51] reported almost isometric growth in L. bohar, L. vivanus, and L. purpureus respectively. In its early larval stage, L. campechanus (Poey, 1860) has an allometric growth pattern, regarding to length of trunk on the standard [54].…”

Section: Shape Variation and Developmental Patternmentioning

confidence: 99%

Morphometric Analysis on Shape Transition during Growth of the Red Snapper (<em>Lutjanus campechanus</em>, Poey, 1860)

Mendoza-Barrera¹,

Vega‐Cendejas²,

Améndola-Pimenta³

et al. 2018

OJMS

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The red snapper Lutjanus campechanus (Poey, 1860) has a high commercial value that sustains an important fishery in Mexico. In this study, the patterns in morphological variations from early juvenile to adult stages were assessed by geometric methods (GM) in 194 organisms. Changes in shape were more evident and rapid in the early juvenile stage and decreased during adulthood. The principal components analysis of shape (Relative Warp Analysis, or RWA) identified size and body depth as the main sources of variance associated to both juvenile and adult organisms. The outline of the head and the tail showed the most noticeable differences following the ontogenic pathway visualized by thin-plate splines indicating that the ontogenetic pathway of the upper half and the lower half of the dorsal head profile (DHP) are in relatively opposite directions than those from the tail that bends ventrally. The Two-Block Partial Least Square analysis (2B-PLS) and their CR coefficients showed that the two modules had a moderate linear trend (p = 0.001). Although the blocks have morphological changes at different rates, there is a moderate synchrony in growth by modules. This study is the first to report the use of geometrical morphometry in L. campechanus in Mexico.

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“…Intra and inter-species difference was reported in the coefficient of condition due to the individual biology of the fish viz., gonad maturation process in male and female, body size, accumulation of lipid and muscle growth (Barnharm and Baxte, 1998), environmental conditions of the habitat such as different salinity regime (Nehemia et al, 2012) and different length class that had been sampled during the study period (Mbaru et al, 2011;Shukor et al, 2008).…”

mentioning

confidence: 99%

Length-weight relationship and relative condition factor of Liza subviridis (Valenciennes, 1836) in Pinang River Estuary, Balik Pulau, Penang, Malaysia

et al. 2017

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(isometric) for females. Independent t-test showed that female b value was higher than that of the males (p<0.05) with no significant difference between the wet and dry seasons (independent t-test, p>0.05). The mean Kn of L. subviridis was 1.01±0.13; however, no significant difference was detected between wet and dry seasons and between male and female samples (independent t-test, p>0.05).Keywords: Length-weight relationship, Liza subviridis, Relative condition factor, Wet and dry season Length-weight relationship and coefficient of condition provide useful information for understanding the biology and ecology of fish in terms of estimating the average weight corresponding to a known length group (Froese, 2006) and in evaluating the relative well-being of a fish population (Bolger and Connolly, 1989). This in turn would provide inputs for development of stock assessment models for sustainable management of fish in an aquatic ecosystem (Mendes et al., 2004). The lengthweight relationship of fishes belonging to the family Mugilidae have been extensively studied worldwide (Moorthy et al., 2003;Lawson and Jimoh, 2010;Dankwa, 2011;Renjini and Nandan, 2011;Gondal et al.,2014).The present study was undertaken to establish the length-weight relationship and relative condition factor of Liza subviridis (Valenciennes, 1836) in a small estuarine area of Pinang River Estuary, Balik Pulau, Penang, Malaysia, which is subjected to various anthropogenic activities. A few researchers have studied the same species in the Merbok Estuary of Kedah (Nor Aziella, 2012) and in the Vellar Estuary of India (Rahman et al., 2013). However, these studies were conducted in large estuarine systems with less anthropogenic effect compared to the Pinang River Estuary considered in this study. The total length of the fishes sampled were measured to the nearest 0.1 cm using measuring board and weighed to the nearest 1 g using a portable scale (OHAUS model LS2000). The shape of the anus was used to differentiate the sex, which was further confirmed by examining the gonads after dissecting the abdomen.The length-weight relationship was calculated as W = aL b (Froese, 2006), where W is total weight (g), L is total length (cm) (from the tip of the snout to the tip of caudal fin), a is constant proportionality (intercept value) and b is allometry coefficient (slope). where, sd ln L and sd ln W are the standard deviations of the ln length and weight. The value of b is significantly different from the cubic law if the t calculated is greater than the t distribution table value for n-2 degrees of freedom. 107The confidence limit of population of L. subviridis was calculated based on formula by Zar (2010):where b is the slope calculated from the length-weight relationship, S 2 is the mean square error and SD TL is the standard deviation of total length.The relative condition factor (Kn) was calculated using the following formula, Kn = W/W' (Le Cren, 1951), as cited by Froese (2006), where W is the total weight (g); W' is aL b , where a and b are the interc...

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Length–weight relationship of 39 selected reef fishes in the Kenyan coastal artisanal fishery

Cited by 24 publications

References 5 publications

Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya

Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya

Morphometric Analysis on Shape Transition during Growth of the Red Snapper (<em>Lutjanus campechanus</em>, Poey, 1860)

Length-weight relationship and relative condition factor of Liza subviridis (Valenciennes, 1836) in Pinang River Estuary, Balik Pulau, Penang, Malaysia

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Length–weight relationship of 39 selected reef fishes in the Kenyan coastal artisanal fishery

Cited by 24 publications

References 5 publications

Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya

Morphometric and developmental characteristics of fish landed by artisanal bait fishers at the Mida Creek, Kenya

Morphometric Analysis on Shape Transition during Growth of the Red Snapper (&lt;em&gt;Lutjanus campechanus&lt;/em&gt;, Poey, 1860)

Length-weight relationship and relative condition factor of Liza subviridis (Valenciennes, 1836) in Pinang River Estuary, Balik Pulau, Penang, Malaysia

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Morphometric Analysis on Shape Transition during Growth of the Red Snapper (<em>Lutjanus campechanus</em>, Poey, 1860)