Weight-length relationships for fish species discarded in commercial fisheries of the Algarve (southern Portugal)

Abstract

Weight and length descriptive statistics are reported for 73 fish species discarded in the commercial fisheries from the south coast of Portugal. Parameters of the weight-length relationship were estimated for 57 of these species. These are the first weight-length parameters reported for 20 of these species. For an additional 16 species for which no weight-length parameters have been reported, the parameter a was estimated by setting b ¼ 3.0. Samples were used from five gear types: crustacean trawler, fish trawler, pelagic purse seine, demersal purse seine and trammel net. Samples were obtained from depths ranging from <30 m to >500 m and included pelagic and demersal species.

Distribution and morphometric characters of the Mediterranean longnosed skate, Dipturus oxyrinchus (Chondrichthyans: Rajidae) in the Gulf of Gabes (Tunisia, Central Mediterranean)

“…Similar results were observed in the North Aegean Sea (b at 3.26 and 3.31 for males and females respectively) [4] . Mori et al [19] (b=3.40) and Kadri et al [20] (b=3.53) reported a positive allometric growth pattern both in sex combined of D. oxyrinchus collected from Algarve (Southern Portugal) and in the North Aegean Sea. The b values vary according to species, sex, age, seasons and feeding.…”

“…The b values vary according to species, sex, age, seasons and feeding. In addition, changes in physiological conditions, different amounts of available food, life span or growth increment can affect the b growth exponent [20,21] . The occurrence of sexual differences in growth is well documented in elasmobranchs, with females usually growing longer [22][23][24][25] .…”

Length-weight Relationship and Condition Factor of Fish Populations in Temengor Reservoir: Indication of Environmental Health

“…Moreover, in this study, factors such as habitat, seasonal effect, stomach fullness, preservation techniques, maturity stage, age and sex which also affect the length-weight relationship (Cherif et al 2008;Ozaydin et al 2007) were not taken into consideration. For these reasons, the estimated length-weight relationship and the values of a and b should be considered as mean annual values, as proposed by several authors (Andreu-Soler et al 2006;Borges et al 2003;Veiga et al 2009). …”

Length-Weight Relationship of Brown Comber, Serranus hepatus, Linnaeus, 1758 from Iskenderun Bay, Northeastern Mediterranean, Turkey

“…There is no information on the lenght-weight relationships (LWR) of this species in Iskenderun Bay, North-eastern Mediterranean Sea. However, brown comber in the other areas of the Mediterranenan were studied satisfactorily on the LWRs by some researchers during recent years (Gonçalves et al,1997;Abdallah, 2002;Borges et al, 2003;Bilecenoğlu, 2009;Çiçek et al, 2006;Dulcic and Glamuzina, 2006;Dulcic et al, 2007;Sangün et al, 2007;Gürkan and Bayhan, 2010;Özgen, 2012;Soykan et al, 2013;Yapıcı et al, 2012;Özvarol, 2014;Akalın et al, 2015;Erdoğan and Torcu-Koç, 2016). In this study, length-weight relationships (LWR) of S. hepatus were examined for the first time in a population of Iskenderun Bay.…”