Replacement of fish meal by cost effective and sustainable plant resources in the formulation of feed for fish is a viable option to alleviate the current crisis in fish feed industries arising due to high cost and non-availability of fish meal. The present research was aimed to evaluate if fermented leaf meal of the aquatic plant Ipomoea aquatica could be used as a fish meal alternative in the formulation of feed for the catfish Heteropneustes fossilis . Fresh green leaves of I. aquatica were sun dried and finely ground to make Ipomea leaf meal (ILM), which was then fermented for 12 days by the phytase producing bacteria Stenotrophomonas maltophilia strain KUAKSP1 (GenBank Accession No. KY790423) isolated from rumen of goat. Four iso-proteinous, iso-lipidous and iso-energetic feeds were formulated by replacing 0, 25, 50 and 75% of fish meal by the fermented Ipomoea leaf meal (FILM). Protein digestibility of the feeds was evaluated within 12 days in an indoor experiment in glass aquaria and growth performance of the fish was evaluated after 8 weeks rearing in outdoor cement tanks. H. fossilis grew better on FILM supplemented feed as compared to fish meal based control feed. Maximum apparent protein digestibility (APD) of the feed, maximum weight gain (WG) and specific growth rate (SGR) and minimum FCR of the fish were found in 50% replacement group. However, crude protein (CP) and crude lipid (CL) deposition in the muscle of the fish and activity of protease in the gut was higher in 25% replacement group. It is concluded that H. fossilis accepts and grows well on the plant based FILM supplemented feed. For better growth management of the fish, incorporation of FILM in the feed should be restricted to 25 to 50% of fish meal.
{"title":"Rearing catfish Heteropneutes fossilis on feed supplemented by fermented leaf meal of Ipomoea aquatica","authors":"Saheli Ali, A. Kaviraj","doi":"10.22034/IJAB.V9I2.999","DOIUrl":"https://doi.org/10.22034/IJAB.V9I2.999","url":null,"abstract":"Replacement of fish meal by cost effective and sustainable plant resources in the formulation of feed for fish is a viable option to alleviate the current crisis in fish feed industries arising due to high cost and non-availability of fish meal. The present research was aimed to evaluate if fermented leaf meal of the aquatic plant Ipomoea aquatica could be used as a fish meal alternative in the formulation of feed for the catfish Heteropneustes fossilis . Fresh green leaves of I. aquatica were sun dried and finely ground to make Ipomea leaf meal (ILM), which was then fermented for 12 days by the phytase producing bacteria Stenotrophomonas maltophilia strain KUAKSP1 (GenBank Accession No. KY790423) isolated from rumen of goat. Four iso-proteinous, iso-lipidous and iso-energetic feeds were formulated by replacing 0, 25, 50 and 75% of fish meal by the fermented Ipomoea leaf meal (FILM). Protein digestibility of the feeds was evaluated within 12 days in an indoor experiment in glass aquaria and growth performance of the fish was evaluated after 8 weeks rearing in outdoor cement tanks. H. fossilis grew better on FILM supplemented feed as compared to fish meal based control feed. Maximum apparent protein digestibility (APD) of the feed, maximum weight gain (WG) and specific growth rate (SGR) and minimum FCR of the fish were found in 50% replacement group. However, crude protein (CP) and crude lipid (CL) deposition in the muscle of the fish and activity of protease in the gut was higher in 25% replacement group. It is concluded that H. fossilis accepts and grows well on the plant based FILM supplemented feed. For better growth management of the fish, incorporation of FILM in the feed should be restricted to 25 to 50% of fish meal.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83243931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The life history parameters, including age, growth, mortality and recruitment of Yellowfin hind, Cephalopholis hemistiktos were studied in monthly collected samples from January to December 2018. Otolith was used for age determination. Mean size by the end of each year of life was estimated and showed that, the highest annual increment was identified at the end of the first year of life then gradually decreased with increase of fish age. The estimated von Bertalanffy growth parameters were L ∞ =43.51 cm, K =0.26 per year, t 0 =-0.74 year. Asymptotic weight W ∞ was estimated as 1375.23 g. The length-weight relationship was W =0.0126 L 3.0746 with R 2 =0.94 for both sexes. The instantaneous rates of total mortality and natural mortality were estimated as 0.77 and 0.49 per year, respectively. The gonado-somatic index showed increasing from April to August with a peak in June for both sexes. Size at first capture (L c ) was estimated as 24.30 cm, which was smaller than the mean size at first sexual maturity 25.31 cm. The value of fishing mortality (F=0.28y -1 ) was slightly higher than the optimum (F opt =0.25y -1 ) and smaller than the limit (F limit =0.33y -1 ) biological reference point, indicating that species was exploited within sustainable limit. Estimated parameters and the relative yield-per-recruit analysis showed that this species is not over-exploited.
对2018年1 - 12月每月采集的黄鳍鱼样本进行了年龄、生长、死亡率和捕集等生活史参数的研究。耳石测定年龄。结果表明，鱼体在第一年末的年增量最大，随着鱼龄的增加，年增量逐渐减小。估计的von Bertalanffy生长参数为L∞=43.51 cm, K =0.26 /年，t =-0.74年。渐近权值W∞估计为1375.23 g。两性长权关系为W =0.0126 L 3.0746, r2 =0.94。估计瞬时总死亡率和自然死亡率分别为每年0.77和0.49。性腺-躯体指数从4月到8月呈上升趋势，男女性腺指数在6月达到高峰。初次捕获时的大小(lc)估计为24.30 cm，小于初次性成熟时的平均大小(25.31 cm)。渔获死亡率值(F=0.28y -1)略高于最优值(F opt =0.25y -1)，小于极限(F极限=0.33y -1)生物学参考点，表明该鱼种处于可持续限度内。估计参数和相对单产分析表明，该物种未被过度开发。
{"title":"Life history parameters of Yellowfin hind, Cephalopholis hemistiktos (Rüppell, 1830) in the coast of United Arab Emirates","authors":"E. Farrag, W. Aly, Ahmed El-Zaabi","doi":"10.22034/IJAB.V9I2.1089","DOIUrl":"https://doi.org/10.22034/IJAB.V9I2.1089","url":null,"abstract":"The life history parameters, including age, growth, mortality and recruitment of Yellowfin hind, Cephalopholis hemistiktos were studied in monthly collected samples from January to December 2018. Otolith was used for age determination. Mean size by the end of each year of life was estimated and showed that, the highest annual increment was identified at the end of the first year of life then gradually decreased with increase of fish age. The estimated von Bertalanffy growth parameters were L ∞ =43.51 cm, K =0.26 per year, t 0 =-0.74 year. Asymptotic weight W ∞ was estimated as 1375.23 g. The length-weight relationship was W =0.0126 L 3.0746 with R 2 =0.94 for both sexes. The instantaneous rates of total mortality and natural mortality were estimated as 0.77 and 0.49 per year, respectively. The gonado-somatic index showed increasing from April to August with a peak in June for both sexes. Size at first capture (L c ) was estimated as 24.30 cm, which was smaller than the mean size at first sexual maturity 25.31 cm. The value of fishing mortality (F=0.28y -1 ) was slightly higher than the optimum (F opt =0.25y -1 ) and smaller than the limit (F limit =0.33y -1 ) biological reference point, indicating that species was exploited within sustainable limit. Estimated parameters and the relative yield-per-recruit analysis showed that this species is not over-exploited.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80893986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Argente, S. Aban, E. C. Capinpin, A. Garcia, Lemark M. Bautista
Knowledge on the optimum environmental conditions for a potential aquaculture species is necessary to simulate an artificial setting. The current study investigated the influence of several environmental parameters on the physiology of the mud clam Geloina expansa under natural condition. Highest CIs were recorded during the months of May to August, averaging to 179.79 (±6.47 SE) while the rest of the months averaged only 158.53 (±2.68). Geloina expansa population monthly GSI in Santiago River ranged from 9.64 to 26.51, low values were observed from November to February (12.00±0.36) and from June to July (12.24±2.59). Chlorophyll a concentration and sediment TOM have significant influence in CI variations. DO significantly affected the changes in GSI. These ecophysiological information are vital for the development of aquaculture techniques for G. expansa in northern Philippines.
{"title":"Some ecophysiological information on Geloina expansa (Bivalvia: Cyrenidae) population in Santiago River, northern Philippines: prelude to aquaculture technique development","authors":"F. Argente, S. Aban, E. C. Capinpin, A. Garcia, Lemark M. Bautista","doi":"10.22034/IJAB.V9I2.858","DOIUrl":"https://doi.org/10.22034/IJAB.V9I2.858","url":null,"abstract":"Knowledge on the optimum environmental conditions for a potential aquaculture species is necessary to simulate an artificial setting. The current study investigated the influence of several environmental parameters on the physiology of the mud clam Geloina expansa under natural condition. Highest CIs were recorded during the months of May to August, averaging to 179.79 (±6.47 SE) while the rest of the months averaged only 158.53 (±2.68). Geloina expansa population monthly GSI in Santiago River ranged from 9.64 to 26.51, low values were observed from November to February (12.00±0.36) and from June to July (12.24±2.59). Chlorophyll a concentration and sediment TOM have significant influence in CI variations. DO significantly affected the changes in GSI. These ecophysiological information are vital for the development of aquaculture techniques for G. expansa in northern Philippines.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79766108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. Amenyogbe, Jian-sheng Huang, Gang Chen, Zhongliang Wang
Agrochemicals, also known as pesticides include nematicides, molluscicides, rodenticides, herbicides, fungicides and insecticides, can control pests, weeds, fungi, rodents, etc. The accumulation of pesticides in the food chain and water has harmful effects on humans and animals. Despite the advantages provided by pesticides, aquatic organisms and human health are affected as the results of continuous usage of pesticides and issues of building up of chemical substances in aquatic organisms, such as fish. Pesticides must be lethal to the targeted species without any effect on non-targeted ones. Pesticides have harmful effects on the nervous system. Other pesticides are known to be carcinogenic substances. This review discussed the effects of pesticides on the immune system, protein, chromosomes, behavior, enzymes, growth, bioaccumulation, genotoxicity and changes in blood biochemical parameters of fish and humans and suggested some possible ways of mitigating such effects.
{"title":"An overview of the pesticides’ impacts on fishes and humans","authors":"E. Amenyogbe, Jian-sheng Huang, Gang Chen, Zhongliang Wang","doi":"10.22034/IJAB.V9I1.972","DOIUrl":"https://doi.org/10.22034/IJAB.V9I1.972","url":null,"abstract":"Agrochemicals, also known as pesticides include nematicides, molluscicides, rodenticides, herbicides, fungicides and insecticides, can control pests, weeds, fungi, rodents, etc. The accumulation of pesticides in the food chain and water has harmful effects on humans and animals. Despite the advantages provided by pesticides, aquatic organisms and human health are affected as the results of continuous usage of pesticides and issues of building up of chemical substances in aquatic organisms, such as fish. Pesticides must be lethal to the targeted species without any effect on non-targeted ones. Pesticides have harmful effects on the nervous system. Other pesticides are known to be carcinogenic substances. This review discussed the effects of pesticides on the immune system, protein, chromosomes, behavior, enzymes, growth, bioaccumulation, genotoxicity and changes in blood biochemical parameters of fish and humans and suggested some possible ways of mitigating such effects.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74044345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Yurimoto, F. M. Kassim, R. Fuseya, K. Matsuoka, Alias Man
Blood cockles, Anadara granosa (Linnaeus, 1758), were collected from the aquaculture grounds (4 stations) of the Selangor coast, Malaysia, and the water quality (water temperature, salinity, dissolved oxygen, turbidity, and chlorophyll a ) was measured from September 2011 to June 2013. At all stations, the water temperature fluctuated around 30℃. At station C, located at the mouth of the Selangor River, the salinity was occasionally lower than 20 PSU. However, the salinity of the other stations fluctuated around 30 PSU. In addition, at all stations, the content of dissolved oxygen generally fluctuated around 3 mg.L -1 or above, and the turbidity changed irregularly, sometimes exceeding 300 Forumajin Turbidity Units. The chlorophyll a content fluctuated mainly ranging 4-20 µg.L -1 at all stations, and values above 20 µg.L -1 were occasionally observed. The phytopigment content, a food availability indicator, in the digestive gland tissue of the blood cockles collected from all stations fluctuated ranging 30-770 µg.g -1 . However, there was no proportional correlation between phytopigment content in the digestive gland and chlorophyll a content at all stations. Therefore, even in a high chlorophyll a content (over 20 µg.L -1 ) environment, the accumulated phytopigment in the digestive gland was around 290 µg.g -1 . In general, these results indicated the cockles were eating a sufficient amount of foods (organic materials including phytoplankton) all year round during the study period. And, the food availability environment in the aquaculture grounds of the Selangor coast was estimated sufficient to grow the blood cockle.
{"title":"Food availability estimation of the blood cockle, Anadara granosa (Linnaeus, 1758), from the aquaculture grounds of the Selangor Coast, Malaysia","authors":"T. Yurimoto, F. M. Kassim, R. Fuseya, K. Matsuoka, Alias Man","doi":"10.22034/IJAB.V9I2.1113","DOIUrl":"https://doi.org/10.22034/IJAB.V9I2.1113","url":null,"abstract":"Blood cockles, Anadara granosa (Linnaeus, 1758), were collected from the aquaculture grounds (4 stations) of the Selangor coast, Malaysia, and the water quality (water temperature, salinity, dissolved oxygen, turbidity, and chlorophyll a ) was measured from September 2011 to June 2013. At all stations, the water temperature fluctuated around 30℃. At station C, located at the mouth of the Selangor River, the salinity was occasionally lower than 20 PSU. However, the salinity of the other stations fluctuated around 30 PSU. In addition, at all stations, the content of dissolved oxygen generally fluctuated around 3 mg.L -1 or above, and the turbidity changed irregularly, sometimes exceeding 300 Forumajin Turbidity Units. The chlorophyll a content fluctuated mainly ranging 4-20 µg.L -1 at all stations, and values above 20 µg.L -1 were occasionally observed. The phytopigment content, a food availability indicator, in the digestive gland tissue of the blood cockles collected from all stations fluctuated ranging 30-770 µg.g -1 . However, there was no proportional correlation between phytopigment content in the digestive gland and chlorophyll a content at all stations. Therefore, even in a high chlorophyll a content (over 20 µg.L -1 ) environment, the accumulated phytopigment in the digestive gland was around 290 µg.g -1 . In general, these results indicated the cockles were eating a sufficient amount of foods (organic materials including phytoplankton) all year round during the study period. And, the food availability environment in the aquaculture grounds of the Selangor coast was estimated sufficient to grow the blood cockle.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84674647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hamidou Arame, A. Adite, Kayode Nambil Adjibade, R. S. Imorou, E. Sossoukpè, S. P. Stanislas
The squeaker, Synodontis schall dominates the Mochokid fish sub-community in Niger River in Northern Benin and shows a great economic and commercial importance. The diet of S. schall has been analysed to evaluate the food habit and resource utilization in this regional River. Fish samplings were made monthly from February 2015 to July 2016 using unbaited longlines and traps, seines and experimental gillnets. The results indicated that S. schall is an omnivore foraging in benthic and pelagic habitats with diet dominated by aquatic insects (34.32%), sand particles (18.768%), macrophytes (13.415%), seeds (8.549%), roots (8.319%), detritus (5.344%), mollusks (1.204%) and phytoplankton (0.6255%). The omnivore food habit depicted was also shown by the ecomorphological analysis mainly the relative gut length (GL/SL) varying between 0.8 and 5. The species showed high diet flexibility with high niche breadth ranging between 1.86 and 5.74. Synodontis schall exhibited an ontogenetic diet shift that was also confirmed by Pianka’s diet overlap indexes ranging between O jk =0.54-0.93. The conservation and the sustainable fisheries exploitation of S. schall require the reinforcement of fishing regulation, habitat protection and ecosystem follow-up.
在贝宁北部尼日尔河中，尖嘴鱼(Synodontis schall)在Mochokid鱼类亚群中占主导地位，具有重要的经济和商业价值。本文分析了该地区河流中沙刺鱼的食性，以评价其食物习性和资源利用情况。从2015年2月至2016年7月，每月使用无饵延绳钓和陷阱、围网和实验刺网进行鱼类取样。结果表明:小鲵为杂食性动物，主要以水生昆虫(34.32%)、沙粒(18.768%)、大型植物(13.415%)、种子(8.549%)、根系(8.319%)、碎屑(5.344%)、软体动物(1.204%)和浮游植物(0.6255%)为食;生态形态学分析表明，相对肠长(GL/SL)在0.8 ~ 5之间。生态位宽度在1.86 ~ 5.74之间，具有较高的食性弹性。关节滑膜炎表现出个体发生性饮食转移，这一点也被Pianka的饮食重叠指数(O jk =0.54-0.93)所证实。对南水北调的保护和渔业可持续开发需要加强捕捞管理、栖息地保护和生态系统后续跟进。
{"title":"Food habits, ecomorphological patterns and niche breadth of the squeaker, Synodontis schall (Pisces: Siluriformes: Mochokidae) from Niger River in Northern Benin","authors":"Hamidou Arame, A. Adite, Kayode Nambil Adjibade, R. S. Imorou, E. Sossoukpè, S. P. Stanislas","doi":"10.22034/IJAB.V9I1.973","DOIUrl":"https://doi.org/10.22034/IJAB.V9I1.973","url":null,"abstract":"The squeaker, Synodontis schall dominates the Mochokid fish sub-community in Niger River in Northern Benin and shows a great economic and commercial importance. The diet of S. schall has been analysed to evaluate the food habit and resource utilization in this regional River. Fish samplings were made monthly from February 2015 to July 2016 using unbaited longlines and traps, seines and experimental gillnets. The results indicated that S. schall is an omnivore foraging in benthic and pelagic habitats with diet dominated by aquatic insects (34.32%), sand particles (18.768%), macrophytes (13.415%), seeds (8.549%), roots (8.319%), detritus (5.344%), mollusks (1.204%) and phytoplankton (0.6255%). The omnivore food habit depicted was also shown by the ecomorphological analysis mainly the relative gut length (GL/SL) varying between 0.8 and 5. The species showed high diet flexibility with high niche breadth ranging between 1.86 and 5.74. Synodontis schall exhibited an ontogenetic diet shift that was also confirmed by Pianka’s diet overlap indexes ranging between O jk =0.54-0.93. The conservation and the sustainable fisheries exploitation of S. schall require the reinforcement of fishing regulation, habitat protection and ecosystem follow-up.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89600864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The olfactory structure of Xenentodon cancila (Hamilton, 1822) were explored by advancement in microtomy, staining and ultrastructural practices. The unique feature of the olfactory system was that the olfactory cavity, an open groove with an obtruding sole lamella, no rosette like organization. The lamella was constituted of the central core, lined on both sides by well-organized epithelium. The central core usually consisted of connective tissue fibres and blood capillaries. The epithelium exhibited compact cellular distribution and made up of receptor cells, supporting cells, lymphatic cells, inner most basal cells and almost never mucous cells. Morphologically specific two types of receptor neurons were recognizable: ciliated and microvillous, comprising sensory terminals. The cellular constitution of olfactory mucosa was explained with olfactory sensitivity of the fish necessitated.
{"title":"Anatomical, histoarchitectural and topological studies on the olfactory organ of freshwater garfish, Xenentodon cancila (Hamilton, 1822)","authors":"S. K. Ghosh","doi":"10.22034/IJAB.V9I1.1041","DOIUrl":"https://doi.org/10.22034/IJAB.V9I1.1041","url":null,"abstract":"The olfactory structure of Xenentodon cancila (Hamilton, 1822) were explored by advancement in microtomy, staining and ultrastructural practices. The unique feature of the olfactory system was that the olfactory cavity, an open groove with an obtruding sole lamella, no rosette like organization. The lamella was constituted of the central core, lined on both sides by well-organized epithelium. The central core usually consisted of connective tissue fibres and blood capillaries. The epithelium exhibited compact cellular distribution and made up of receptor cells, supporting cells, lymphatic cells, inner most basal cells and almost never mucous cells. Morphologically specific two types of receptor neurons were recognizable: ciliated and microvillous, comprising sensory terminals. The cellular constitution of olfactory mucosa was explained with olfactory sensitivity of the fish necessitated.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83312388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Capoeta baliki was described from Sakarya basin, Turkey. It was distinguished from its nearest congener i.e. C. tinca based on a combination of characters, including fewer serrae along posterior margin of last simple dorsal-fin ray, modally fewer scale rows between lateral line and dorsal-fin origin, fewer vertebrae, deeper and shorter head and slenderer caudal peduncle. We examined the synonymy hypothesis of C. baliki and C. tinca by comparing their morphometric, meristic and molecular characters. Based on the results, their morphometric and meristic characters largely overlapped and no character was found to distinguish them. In addition, a low K2P mean genetic divergence of 0.37% C. baliki and C. tinca based on cyt b gene and clustering in same clad showed that they are identical in molecular characters. As no character could be found to clearly distinguish these species, we treat C. baliki as a junior synonym of C. tinca .
{"title":"Capoeta baliki Turan, Kottelat, Ekmekçi & Imamoglu, 2006 a junior synonym of Capoeta tinca (Heckel, 1843) (Teleostei: Cyprinidae)","authors":"E. Çiçek, S. Eagderi, S. Sungur, Burak Seçer","doi":"10.22034/IJAB.V0I0.1118","DOIUrl":"https://doi.org/10.22034/IJAB.V0I0.1118","url":null,"abstract":"Capoeta baliki was described from Sakarya basin, Turkey. It was distinguished from its nearest congener i.e. C. tinca based on a combination of characters, including fewer serrae along posterior margin of last simple dorsal-fin ray, modally fewer scale rows between lateral line and dorsal-fin origin, fewer vertebrae, deeper and shorter head and slenderer caudal peduncle. We examined the synonymy hypothesis of C. baliki and C. tinca by comparing their morphometric, meristic and molecular characters. Based on the results, their morphometric and meristic characters largely overlapped and no character was found to distinguish them. In addition, a low K2P mean genetic divergence of 0.37% C. baliki and C. tinca based on cyt b gene and clustering in same clad showed that they are identical in molecular characters. As no character could be found to clearly distinguish these species, we treat C. baliki as a junior synonym of C. tinca .","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87897153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Maxim Veroli, M. Martinoli, R. Caprioli, C. Angelici, D. Pulcini, F. Capoccioni
Procambarus clarkii is a native species of Central America, but strongly invasive in many regions of the world. An investigation on the red swamp crayfish was carried out to obtain more information about its population dynamics in the Tiber River, in Central Italy. A total of 900 individuals, both males and females, were sampled within two different campaigns (2017 and 2019) aimed at collecting biometric data. A strong fishing effort was deployed (more than 100 nets set), to guarantee a large and randomized number of samples. The crayfish populations were grouped into seven different cohorts, according to Bhattacharya’s method. The population showed a balanced sex ratio, the average cephalothorax length was 42.52 mm, with the most represented size class between 40-50 mm. K and L ∞ , as well as the growth parameter index (O), the mortality rate (Z), and longevity value (t max ), were calculated. K and O values resulted very high, showing an impressive growth rate in the study area; t max ranged from 4 to 5 years, L ∞ values were lower compared with other studies (58.0-59.0 mm), while Z was very high for this population (4.2-4.5 year). The results revealed that crayfish population dynamics can be complex and vary depending on habitat type, available trophic resource and competition.
{"title":"Population structure and dynamics of the invasive Procambarus clarkii (Girard, 1852) in a Tiber river Ramsar site, Central Italy","authors":"Maxim Veroli, M. Martinoli, R. Caprioli, C. Angelici, D. Pulcini, F. Capoccioni","doi":"10.22034/IJAB.V0I0.1006","DOIUrl":"https://doi.org/10.22034/IJAB.V0I0.1006","url":null,"abstract":"Procambarus clarkii is a native species of Central America, but strongly invasive in many regions of the world. An investigation on the red swamp crayfish was carried out to obtain more information about its population dynamics in the Tiber River, in Central Italy. A total of 900 individuals, both males and females, were sampled within two different campaigns (2017 and 2019) aimed at collecting biometric data. A strong fishing effort was deployed (more than 100 nets set), to guarantee a large and randomized number of samples. The crayfish populations were grouped into seven different cohorts, according to Bhattacharya’s method. The population showed a balanced sex ratio, the average cephalothorax length was 42.52 mm, with the most represented size class between 40-50 mm. K and L ∞ , as well as the growth parameter index (O), the mortality rate (Z), and longevity value (t max ), were calculated. K and O values resulted very high, showing an impressive growth rate in the study area; t max ranged from 4 to 5 years, L ∞ values were lower compared with other studies (58.0-59.0 mm), while Z was very high for this population (4.2-4.5 year). The results revealed that crayfish population dynamics can be complex and vary depending on habitat type, available trophic resource and competition.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81091949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Morphology of structures involved in the posterior region of scales in two flathead fish species viz. Platycephalus indicus and Grammoplites suppositus was studied using ultramicroscopy. The fish individuals were divided into three size groups based on their standard lengths and their scales were removed from four body regions. The microscopic observations indicated that the scales of both species were ctenoid. The posterior margin of all scales was formed by two rows of ctenii. Typically, the shape of the posterior region of scales in P. indicus was crescent, while it was triangular in G. suppositus . The number of ctenii in the scales of P. indicus was minimum 12 and maximum 60, while in G. suppositus it was minimum 6 and maximum 38. Moreover, the results indicated that the number of ctenii was increased during fish development because the smaller fishes have fewer ctenii in their scales than the adults, while, their general morphology has not been changed properly. This developmental change was significantly higher in P. indicus than G. suppositus . The increase of ctenii during fish development allows greater flexibility in movement. In conclusion, modification in the ornamentations of the posterior region has a hydrodynamic function and they are subject to modification during the fish development. The ctenii varying considerably in the number and could be easily counted, therefore, could be used as an appropriate taxonomic character at least in flathead fishes or even other fish groups.
{"title":"Ultramicroscopy of structures involved in the posterior region of scales in two flathead fishes (Teleostei: Perciformes)","authors":"A. Teimori, M. Motamedi, Vahid Amiri, M. Hesni","doi":"10.22034/IJAB.V0I0.950","DOIUrl":"https://doi.org/10.22034/IJAB.V0I0.950","url":null,"abstract":"Morphology of structures involved in the posterior region of scales in two flathead fish species viz. Platycephalus indicus and Grammoplites suppositus was studied using ultramicroscopy. The fish individuals were divided into three size groups based on their standard lengths and their scales were removed from four body regions. The microscopic observations indicated that the scales of both species were ctenoid. The posterior margin of all scales was formed by two rows of ctenii. Typically, the shape of the posterior region of scales in P. indicus was crescent, while it was triangular in G. suppositus . The number of ctenii in the scales of P. indicus was minimum 12 and maximum 60, while in G. suppositus it was minimum 6 and maximum 38. Moreover, the results indicated that the number of ctenii was increased during fish development because the smaller fishes have fewer ctenii in their scales than the adults, while, their general morphology has not been changed properly. This developmental change was significantly higher in P. indicus than G. suppositus . The increase of ctenii during fish development allows greater flexibility in movement. In conclusion, modification in the ornamentations of the posterior region has a hydrodynamic function and they are subject to modification during the fish development. The ctenii varying considerably in the number and could be easily counted, therefore, could be used as an appropriate taxonomic character at least in flathead fishes or even other fish groups.","PeriodicalId":36975,"journal":{"name":"International Journal of Aquatic Biology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89373517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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