<abstract xmlns="http://www.w3.org/1999/xhtml">In Mexico, studies of octopus <italic>Paroctopus digueti</italic> are scarce, thus the objective of this research is to evaluate some of its biological aspects in Ohuira Bay, Ahome, Sinaloa, Mexico. From autumn 2016 to autumn 2017, a total of 217 organisms of <italic>P. digueti</italic> were collected, from which 166 were females, 31 ovigerous females and 20 males. The lengths of the mantle (ML), tentacles or arms (AL) and total length (TL) were recorded as well as the total weight (TW) of each organism. The software FiSAT II was used to obtain the growth parameters by mediating seasonal size frequencies. Considering both sexes, the average registered mantle length was 40.31±2.5 mm. For the analysis of ML-TL y ML-AL, the data were adjusted to a linear-type model. For the relationship between ML-TL, the minimum determination coefficient was observed during spring R2 = 0.335, and the highest was registered in winter R2 = 0.6452. With regards to the allometry coefficient (<italic>b</italic>), it was different among the 4 climatic seasons. The theoretical ML growth curve showed both sexes of ML∞= 73.50 mm, K = 1.30 year−1 and t0= 0.10. The estimated values from the growth equation revealed faster growth (ML∞= 63 mm) within the 1.2 years of their lives, reaching a maximum length at 2.5 years of age. The total weight growth curve of <italic>P. digueti</italic> octopus was formed by an exponential first stage up to six months and the second logarithmic stage from seven months to approximately 1.8 years. In the summer there were slightly lower coefficients and percentages of instantaneous growth coefficients (IGC) for the lengths and total weight of octopus <italic>P. digueti</italic>. The highest Fulton’s condition index (k) was recorded in winter. The sex ratio was significant in a proportion of 9.85 F:1 M.</abstract>

Unidad Los Mochis. Departamento de Biología

Instituto Politécnico Nacional, CIIDIR-Unidad Sinaloa, Departamento de Acuacultura

Growth and Sex Ratio of Octopus <italic>Paroctopus Digueti</italic> (Perrier &amp; Rochebrune, 1894) in a Wild Population

<abstract xmlns="http://www.w3.org/1999/xhtml">Buško Blato Reservoir, the third largest hydro accumulation in Europe, is situated in the south-eastern part of the karstic Livanjsko Polje Valley. This aquatic ecosystem is distinguished by a very rich ichthyofauna and the presence of four endemic fish species. Numerous studies focus on ichthyological researches of Buško Blato Reservoir. Its ichthyofauna has been exposed to changes in ecological factors, which in turn reflected on the structure and composition of fish populations. The main objective of this paper was to assess the current state and predict future trends in the ichthyofauna structure and dynamics based on the field data and comprehensive analyses of literature data. The results of the research indicated the presence of 11 fish species from four families, which is the largest number of fish species ever recorded in this ecosystem. <italic>Sander lucioperca</italic>, <italic>Lepomis gibbosus</italic>, <italic>Pseudorasbora parva</italic> and <italic>Tinca tinca</italic> were recorded for the first time in this ecosystem, while some previously recorded species were not found. The results of the analyses clearly indicate the presence of natural interspecific competition and significant level of threats to the endemic fish species caused by human activities.</abstract>

University of Sarajevo-Institute for Genetic Engineering and Biotechnology

Long-Term Trends in the Structure and Dynamics of the Fish Communities in Buško Blato Reservoir

<abstract xmlns="http://www.w3.org/1999/xhtml">Effects of dietary supplementation of <italic>Pleurotus pulmonarius</italic> stalk meal on growth, gut microflora and intestinal morphology of <italic>Clarias gariepinus</italic> were assessed in this study. The stalk meal was incorporated at 0.0 g/100 g (Control), 2.5 g/100 g (PSM 2), 5.0 g/100 g (PSM 3), 7.5 g/100 g (PSM 4) and 10.0 g/100 g (PSM 5). <italic>Clarias gariepinus</italic> (n=375), with an initial weight of 10.84±0.04 g, were allotted at 25 fish/60 litres of water in a completely randomised design for each diet treatment in triplicate. Feeding trial was conducted for eight weeks. Weight gain, specific growth rate, survival rate, feed intake and feed conversion ratio were not significantly different across all diet treatments. However, the production performance index of the fish and protein efficiency ratio were higher in fish fed PSM 3 diet than other treatments. Total viable bacteria count in the gut ranged from 7.56 (PSM 2) to 8.34 log10 cfu/g (PSM 4), while lactic acid bacteria count was between 5.00 (control) and 7.03 log10 cfu/g (PSM 3). <italic>Escherichia coli</italic> were identified in the gut of the control group but were not detected in those fed supplemented diets. More colonies of <italic>Salmonella</italic> and <italic>Vibrio</italic> species were observed in the control but fewer colonies in the diets supplemented groups. The proximal, middle and distal villus length, proximal, middle and distal cryptal depth, proximal and distal absorption area of fish fed supplemented diet were higher than those of the control. Conversely, proximal, middle and distal villus width and middle absorption area were not significantly different. In spite of observable favourable gut microflora and gut histomorphology of fish fed supplemental <italic>P. pulmonarius</italic> stalk meal diet, these attributes did not manifest in growth performance indices.</abstract>

Department of Fish Technology and Product Development

Department of Aquaculture and Fisheries Management

Agricultural Biochemistry and Nutrition Unit, Department of Animal Science

Growth, Gut Morphology and Microflora of African Catfish <italic>Clarias gariepinus</italic> Fed Mushroom (<italic>Pleurotus pulmonarius</italic>) Stalk Meal Supplemented Diets

<abstract xmlns="http://www.w3.org/1999/xhtml">Accessory respiratory is generally accepted to have evolved independently on numerous occasions in adaption to aquatic hypoxia in freshwater habitats. In general, the air-breathing organ in fish is believed to be structurally modified to supplement respiration. In this study, intuitive evidence for elaborate structural modifications of the intestine, an air-breathing organ in mud loach (<italic>Misgurnus anguillicaudatus</italic>), compared with two other obligate aquatic breathers, grass carp (<italic>Ctenopharyngodon idellus</italic>) and yellow catfish (<italic>Pelteobagrus fulvidraco</italic>), were directly provided by histological and morphometric methods. As a result, a sharply decreasing height of mucosal folds and thickness of muscularis were manifested in loach intestine from its anterior to posterior region. Compared with grass carp and yellow catfish, loach had the smallest ratios of mucosal fold height/muscularis thickness to intestinal lumen radius in the posterior intestine. These suggested that the posterior intestine is the air-breathing location for the loach. Furthermore, length density of capillary (0.46±0.05 μm−2) in the posterior intestine of the loach was significantly higher than those of grass carp and yellow catfish. Meanwhile, diffusion distance of air-blood barrier (1.34±0.04 μm) in the posterior intestine of the loach was significantly smaller than those of the other two fish species. In summary, the characteristics of highly vascularized, short diffusion distance of air-blood barrier, thinned and flattened made the posterior intestine a perfect air-breathing location for the loach.</abstract>

Hubei Provincial Engineering Laboratory for Pond Aquaculture

Comparative Histological Analysis of Intestines of Loach, Grass Carp and Catfish Provide Insights into Adaptive Characteristics in Air-Breathing Fish

<abstract xmlns="http://www.w3.org/1999/xhtml">In the present study, <italic>Salmonella</italic> spp. was successfully isolated from Asian clam <italic>Corbicula fluminea</italic> by using Xylose Lysine Deoxycholate (XLD) selective agar. A total of 200 bacterial colonies from live Asian clams were isolated and subjected to antimicrobial sensitivity test by using disc diffusion method. A total of 18 antibiotics was applied in the present study, namely oxolinic acid, nalidixic acid, erythromycin, tetracycline, doxycycline, oleandomycin, oxytetracycline, spiramycin, ampicillin, kanamycin, fosfomycin, florfenicol, lincomycin, novobiocin, chloramphenicol, amoxycillin, flumequine and sulphamethoxazole. The findings of the present study showed that total antibiotic sensitive case for <italic>Salmonella</italic> spp. isolated from <italic>C. fluminea</italic> sample was 50% or 1800 cases. This was followed by antibiotic resistance case 45% or 1620 cases and intermediary antibiotic sensitive case (5% or 180 cases). Based on the results of the present study, tetracycline, doxycycline, oxytetracycline and flumequine showed the highest inhibition of isolated <italic>Salmonella</italic> spp. The multiple antibiotic resistance (MAR) index was 0.36, indicating the sampled clams were highly exposed to the tested antibiotics.</abstract>

Assessment of Antimicrobial Resistance of <italic>Salmonella</italic> spp. Isolated from Farmed Asian Clam <italic>Corbicula Fluminea</italic>

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Croatian Journal of Fisheries

Volume 78 (2020): Issue 2 (June 2020)

Growth and Sex Ratio of Octopus Paroctopus Digueti (Perrier & Rochebrune, 1894) in a Wild Population

Long-Term Trends in the Structure and Dynamics of the Fish Communities in Buško Blato Reservoir

Growth, Gut Morphology and Microflora of African Catfish Clarias gariepinus Fed Mushroom (Pleurotus pulmonarius) Stalk Meal Supplemented Diets

Comparative Histological Analysis of Intestines of Loach, Grass Carp and Catfish Provide Insights into Adaptive Characteristics in Air-Breathing Fish

Assessment of Antimicrobial Resistance of Salmonella spp. Isolated from Farmed Asian Clam Corbicula Fluminea

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