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The article discusses the elevated rearing densities necessary for profitable aquaculture operations are generally related to declining water quality, which may affect fish welfare and juvenile quality. The motivation for this research was to provide information on the potential effects of chronic exposure to ammonia on juvenile Atlantic cod raised in recirculating aquaculture systems since ammonia build up is frequently reported in such systems. Ammonia can significantly reduce growth, and can adversely affect different organs and functions.

The goal of this study was to determine the basic haematological profile of common carp ( Cyprinus carpio L.) spawners of eight breeds reared under identical conditions and sampled in spring after overwintering. Significant differences were found among the breeds for haemoglobin level (Hb), haematocrit value (PCV), mean corpuscular volume (MCV) and mean corpuscular haemoglobin (MCH) values. The number of red blood cells (RBC), mean corpuscular haemoglobin concentration (MCHC), number of leukocytes (WBC) and leukocyte differential count (WBC DIFF) did not differ significantly among the respective breeds. The highest Hb, PCV and MCH values were found for Ropsha scaly carp (ROP) and Amur wild carp (AS) (Hb 109 ± 17 and 106 ± 15 g l−1; PCV 0.40 ± 0.06 and 0.40 ± 0.06 l l−1; MCH 69 ± 7 and 69 ± 9 pg, respectively). The AS specimens and breeds that originated [ROP, Ukraine scaly carp (US), and Northern mirror carp (M72)] showed significantly higher values of Hb (P < 0.01), PCV (P < 0.01), MCV (P < 0.05) and MCH (P < 0.05), compared to the other four breeds: Hungarian mirror carp (M2), Israeli mirror carp (Dor 70), South Bohemian mirror carp (BV) and Tata scaly carp (TAT). Males showed significantly higher PCV, Hb and RBC values within individual breeds. This study demonstrated that Amur wild carp and breeds originating from it had significantly higher values of erythrocyte profile in comparison with the other breeds studied. [ABSTRACT FROM AUTHOR]

The article discusses the characteristics of synechogobius hasta. This has been identified as a species destined for diversification of Chinese marine aquaculture. The development of high quality formulated feed, based on the nutrient requirements of the species, will help improve economical and environmental sustainability of aquaculture in the country. Dietary lipids play not only important roles as potential sources for energy, essential fatty acids and fat-soluble vitamins, but also have important physiological functions.

On 7 November and 15 December 2006, two specimens of the Lessepsian migrant Fistularia commersonni were caught in trammel nets off the coastal waters of Tricase Porto (southwestern Adriatic, Italy) and Sveti Andrija (southeastern Adriatic, Croatia), respectively. These represent the first records of this species in the Adriatic Sea. [ABSTRACT FROM AUTHOR]

Weight–length relationships (WLR) are reported for 20 fish species from the mangroves of Guadeloupe (Lesser Antilles). The fishes were collected using fishing hoop nets. In the present study, the regressions were calculated after separating juveniles and adults. The b coefficient in the WLR varied between 2.37 and 3.85, with a mean of 3.15 ± 0.15. [ABSTRACT FROM AUTHOR]