Now showing items 1-20 of 22

    • Technical Report

      An annotated list of scientific and english common names of commercially important penaeid prawns and shrimps 

      H Motoh - 1977 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Technical report / SEAFDEC Aquaculture Department; No. 2
      There are 318 species of penaeid shrimps (Family Penaeidae) recorded in the world, of which about 80 species are placed under exploitation in fishing industry and/or cultivated artificially. The species under the genus Penaeus are particularly favored for human consumption because of their larger size and palatability and are therefore exposed to extensive capture by fishing boats. The shrimp fishing industry has developed in various parts of coastal waters worldwide extending from the temperate to tropical zones in both hemispheres. The nations engaged in shrimp fishing are numerous; Japan, U.S.A., Mexico, Thailand, India, lead in terms of volume of catch. Japan, for instance one of the large shrimp consuming nations in the world, has been dispatching shrimp fishing boats to many countries whether on her own capital or in joint ventures. Japan annually imports some 100,000 tons of frozen shrimp of which penaeids rank first in quantity. Meanwhile, the demand for shrimp is expected to rise in the years to come.

      The shrimp fishing industry and its operation are conducted and managed naturally, as indicated above, under international agreement. However, confusions arise particularly regarding the common names of shrimp caught or the products. It is evident that many commercial species of penaeids are given common names which differ from one country to another. For instance, the so-called "white shrimp" adopted by commercial circles includes nine different species. Understandably, these nine species, aside form being closely related biologically, are characterized by whitish coloration of the body.

      The present list was compiled to show the status of shrimp nomenclature, based on available literature, giving scientific names and English common names adopted or applied. The present article is written in the hope that the common names of penaeid shrimp shall be standardized internationally at least in English. Needless to say, the standardization will contribute greatly to world trading, as well as to scientific studies.
    • Article

      Diel fluctuations in catch of the postlarval Penaeus japonicus group 

      H Motoh, N Solis & M Gelangre - SEAFDEC Aquaculture Department Quarterly Research Report, 1979 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Experiments were undertaken in order to measure the diel fluctuations in the catch of the post-larvae of P. japonicus in relation to the tidal cycles, light conditions and water temperature. The fluctuations are discussed comparing them with other post-larvae Penaeus species appearing along shore waters in the Philippines.
    • Article

      Early postmysis stages of the giant tiger prawn, Penaeus monodon Fabricius 

      H Motoh & P Buri - Researches on Crustacea, 1980 - Carcinological Society of Japan
      The morphological development of the early postmysis stages of the giant tiger prawn, Penaeus monodon are described and illustrated using laboratory-reared specimens and wild ones.

      The first 3 or 4 substages are termed "megalopa" owing to the incomplete branchial formula of the mouth parts, their pelagic or planktonic behavior and their somewhat narrower body. At the 4th or 5th substage, the branchial formula is completed, their behavior is more or less epibenthic, the chromatophores are densely distributed from the tip of the antennular flagella through the ventral side of the abdomen to the tip of the telson. At the beginning of the 7th substage, the chromatophores are distributed over almost the whole body. Thus from the 4th or 5th substage onwards they may be termed juveniles.

      The main characteristics development are as follows : 1) The cempletion of the rostral spine formula appears in the 7th or 8th substage showing 7 dorsal and 3 ventral spines. 2) The endopod of the 1st maxilliped develops again at the 7th substage, although it degenerates with every molt prior to the 7th. 3) From the 1st substage, the distal 3 segments of the endopod of the 2nd maxilliped are bent sharply inwards.
    • Article

      Ecology and life history of penaeid shrimps 

      H Motoh, N Solis & E Caligdong - SEAFDEC Aquaculture Department Quarterly Research Report, 1977 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Fourteen species of penaeid shrimps with commercial value in Batan Bay and Tigbauan-Guimbal waters were identified as follows: Penaeus monodon, P. semisulcatus, P. japonicus, Metapenaeus ensis, M. burkenroadi, M. endeavouri, Metapenaeopsis palmensis, M. stridulans, Trachypenaeus fulvus, and Parapenaeus longipes. Among the 14 penaeids, P. semisulcatus, M. ensis and M. palmensis were found to be the dominant species within each genus. There are seven existing fishing gears for shrimping in the Batan Bay and Tigbauan-Guimbal waters: fish corrals, lift net, filter net, gill net, skimming net, baby trawler and commercial trawler. In general, female penaeids are larger than males. The largest P. monodon female measured was 81 mm in carapace length with 23 g in body weight. The largest male measuring 59 mm in carapace length with 119 g of body weight was caught in Batan Bay. Judging from spermatozoa occurrence on both sexes of P. monodon, the biological minimum size for male is 37 mm in carapace length and 49 mm for female. A total of 133 Penaeus postlarvae obtained from the offshore were identified by comparison with those reared in the laboratory. The postlarvae of P. japonicus-latisulcatus complex were quite dominant (60.2%), followed by P. semisulcatus (18.0%), and P. merguiensis-indicus complex (17.3%). The number of P. monodon postlarvae was relatively small (4.5%). The modal carapace length of P. monodon postlarvae from the offshore was 1.3 mm with three or four dorsal and no ventral spines on the rostrum, while P. monodon fry from the shoreline had 2.3 mm with five or six dorsal and one or two ventral spines.
    • Book

      Field guide for the edible crustacea of the Philippines 

      H Motoh - 1980 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Information on each species includes: 1) taxonomy (scientific, English and Philippine names) and diagnostic characters: 2) ecology; 3) distribution; 4) fisheries data; 5) economics (potential, price).
    • Technical Report

      Fishing gear for prawn and shrimp used in the Philippines today 

      H Motoh - 1980 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Technical report / SEAFDEC Aquaculture Department; 5
      This paper describes various types of shrimping and prawning gear and devices, most of which have been traditionally used in the Philippines, with some ecological notes. This study provides basic information on prawn culture and fry collection, which will be useful for private fishpond operators and workers.
    • Article

      A further note to “fishing gear for prawn and shrimp used in the Philippines today” 

      H Motoh - Researches on Crustacea, 1983 - Carcinological Society of Japan
      Motoh (1980) reported 9 and 13 kinds of shrimping gear for the fry and the adult respectively, of which most of them are indigenously used today in the Philippines. Howerver, druing the continued ecological survey of penaeids in the country conducted by him and his staff, six kinds of shrimping gear or devices were additionally found by them, which have been used traditionally in the country.

      The reasons that the present author intends to introduce the gear or devices are as follwos: 1) To record theses unque devices from the nature conservation point of view, which were invented by local people through their long experiences, though devices been forgotten due to their poor catching effectiveness, and 2) To recommend the continuous use of these devices by local people, which impose much less construction technique and energy on the users compared to modern mechanized catching tools.
    • Article

      Identification of postlarvae of the genus Penaeus appearing in shore waters 

      H Motoh & P Buri - Researches on Crustacea, 1981 - Carcinological Society of Japan
      Diagnostic features for the identification of postlarval Penaeus found in the shore waters of the Philippines are described and categorized based on specimens caught from the wild and those hatched and reared in the laboratory.

      Differentiating features for postlarval Penaeus are given which include the relative length of the antennular flagellum, the shape of the rostrum and number of rostral teeth, the antennal spine, the spinules on the dorsal caina of the sixth abdominal segment, and chromatophore patterns.

      Postlarval Penaeus were classified into two species and two groups as follows: (1) P. monodon, larger in size with dense chromatophores, and the long inner antennular flagellum being more than 2.0 times the outer antennular flagellum; (2) P. semisulcatus, the inner flagellum being 1.6 to 2.0 times the outer antennular flagellum, the the absence of chromatophore on the middle portion of the telson and uropods; (3) P. merguiensis group, less pigmented, the inner flagellum being less than 1.6 times the outer flagellum and (4) P. japonicus group, a short rostum, presence of spinules on the dorsal carina of the sixth abdominal segment, and dense chromatophores. The determinations were confirmed by rearing experiments.
    • Article

      Laboratory breeding of the mud crab Scylla serrata (Forskal) through the zoea and megalopa stages to the crab stage 

      H Motoh, D de la Peña & E Tampos - SEAFDEC Aquaculture Department Quarterly Research Report, 1977 - Aquaculture Department, Southeast Asian Fisheries Development Center
      A series of experiments is being conducted to establish breeding techniques to mass-produce seedlings of S. serrata for pond cultivation to meet the commercial demand for the crab. The objective is to culture the crab through the 5 zoea stages and 1 megalopa stage to the crab stage. A brief resume of the experiments is presented. Heavy mortality occurred at the 1st, 2nd and 5th zoea stages, and during the megalopa stage. Initial mortality is attributed to unfavourable rearing conditions, and later mortality to cannibalism.
    • Article

      Larvae of decapod crustacea of the Philippines - I. The zoeal stages of a swimming crab, Charybdis cruciata (Herbst) reared in the laboratory 

      H Motoh & AC Villaluz - Nippon Suisan Gakkai Shi. Bulletin Of The Japanese Society Of Scientific Fisheries, 1976 - The Japanese Society of Scientific Fisheries
      Six zoeal stages of Charybdis cruciata (Herbst) which are reared in the laboratory, are described. The zoea has a rostral, a dorsal and a pair of laterial spines. There are a pair of lateral hooks on the 2nd and 3rd abdominal segments. The number of natatory hairs on the rirst and second maxillipeds increased by one pair at each molt, being 4, 6, 8, 10, 12 and 14, in the 1st to 6th zoea, respectively. The number of inner setae on the telson are 3+3 in stage 1; 4+4 in stages 2 and 3, 4+1+4 in stage 4, and 5+5 in stages 5 and 6. Spinal arrangement form proximal to distal segment of the endopodite of the first maxillipeds are 2-2-0-2-5 in stages 1-3 and 2-2-1-2-6 in stages 4-6 and that of the second maxillipeds are 1-1-4 in stages 1 and 2 and 1-1-5 in stages 3-6.
    • Article

      Larvae of decapod crustacea of the Philippines. III. Larval development of the giant tiger prawn, Penaeus monodon reared in the laboratory 

      H Motoh - Nippon Suisan Gakkai Shi. Bulletin Of The Japanese Society Of Scientific Fisheries, 1979 - The Japanese Society of Scientific Fisheries
      The egg, larval stages and the first postlarva of the giant tiger prawn, Penaeus monodon Fabricius, reared from egg in the laboratory are described and illustrated.

      Six naupliar, three protozoeal and three mysis stages are recognized. The larvae of P. monodon are morphologically similar to those of P. japonicus described by Hudinaga except for the following characters: 1) number of setae on first antenna of fourth and fifth nauplii is 5 or 6 in P. monodon, but it is 7 in P. japonicus; 2) supra-orbital spine of second protozoea is bifurcated at base in P. monodon, but at tip in P. japonicus; 3) number of segments of endopod of second maxilliped of second mysis is 5 in P. monodon, but it is 4 in P. japonicus; 4) number of rostral spines in second and third myses is 0 and 0 or 1 respectively in P. monodon, but it is 1 and 2 respectively in P. japonicus.
    • Article

      The larval stages of benizuwai-gani, Chinoecetes japonicus Rathbun reared in the laboratory 

      H Motoh - Nippon Suisan Gakkai Shi. Bulletin Of The Japanese Society Of Scientific Fisheries, 1976 - The Japanese Society of Fisheries Science
      This study deals with the larval stages of C. japonicus, and with the comparison with those of Zuwaigani, C. opilio. There are 2 zoneae and 1 megalopa. The larval stages of C. japonicus are morphologically similar to those of C. opilio excepting some characters as follows: (1) Chromatophores of Zoeae and megalopa are vermillion or crimson in C. japonicus and brown or reddish in C. opilio. (2) C. japonicus is generally bigger than C. opilio in zoeae and megalopa. (3) Length of postero-lateral spine on 3rd abdominal segment is>1.3times the length of the 4th abdominal segment in C. japonicus, but is shorter than (rarely equal to) that in C. opilio. (4) Ischiopodite of cheliped has no spine in C. japonicus, but it has a spine in C. opilio, in megalopa.
    • Article

      On a new species of Metapenaeus (Crustacea, Decapoda: Penaeidae) from the Philippines 

      H Motoh & MS Muthu - Nippon Suisan Gakkai Shi. Bulletin Of The Japanese Society Of Scientific Fisheries, 1979 - The Japanese Society of Fisheries Science
      A new species of penaeid prawn, Metapenaeus philippinensis from the Philippines is described in detail and compared with the closely related species, M. ensis. The petasma of the new species which superficially resembles that of M. ensis is markedly different in details; the distomedian lobes have rounded postern-lateral comers and the denticles are borne on a crescentic ridge on the disto-medial aspect of the lobes. The thelycum is also distinctive, with lateral tufts of setae and two conical pillar like prominences at the posterior end of the lateral plates and a characteristic median plate which is broader posteriorly than anteriorly. The new species is devoid of dorsal carina on the first three abdominal segments.
    • Article

      On a new species of Trachypenaeus (Crustacea, Decapoda: Penaeidae) from the Philippines, with notes on related species 

      MS Muthu & H Motoh - Researches on Crustacea, 1979 - Carcinological Society of Japan
      Trachypenaeus villaluzi a new species of penaeid prawn from the Philippines is described in detail and compared with the related species. The new species is characterized by the following features : Mastigobranchia are present on the 2nd and 3rd pereiopods, but absent on the first ; anterior plate of thelycum is deeply concave ; the lower margin of the distolateral projections of the petasma is concave. It is also suggested that Trachypenaeus asper Alcock Should be considered as a valid species instead of being treated as a synonym of T. curvirostris (Stimpson).
    • Article

      On the new species of Penaeus (Crustacea, Decapoda: Penaeidae) from North Borneo 

      MS Muthu & H Motoh - Researches on Crustacea, 1979 - Carcinological Society of Japan
      A new species of penaeid prawn, Penaeus silasi from North Borneo is described in detail and compared with the closely related species such as P. indicus, P. merguiensis and P. penicillatus. The new species is characterized by the following features : The 3rd maxilliped of the adult male has a dactylus as long as or slightly shorter than the propodus which has only a rudimentary tuft of hair instead of a long tuft of bristles as in P. indicus; the anterior plate of the thelycum is triangular and relatively prominent.
    • Article

      Preliminary histological study of the ovarian development of the giant tiger prawn, Penaeus monodon 

      H Motoh - SEAFDEC Aquaculture Department Quarterly Research Report, 1978 - Aquaculture Department, Southeast Asian Fisheries Development Center
      This study was undertaken to determine structural characteristics within the gonads which might serve as an index to age and longevity and furnish information on the frequency of spawning of an individual.
    • Conference paper

      A preliminary report on the fauna of decapod crustacea in the mangrove and estuarine areas of Batan Bay, Panay Island, Philippines 

      H Motoh & NB Solis - In Proceedings of the International Workshop on Mangrove and Estuarine Area Development for the Indo-Pacific Region, Manila, Philippines, 14-19 November 1977, 1977 - Los Baños, Laguna, Philippines: Philippine Council for Agricultural and Resources Research
      In the Philippines, the total mangrove site for aquaculture development and others is about 576,000 hectares which constitute only 1.9 percent of the country's land resources. There are at present about 176,000 hectares of fishponds, representing 30.5 percent of the total mangrove resources in the country.

      Located in the northern part of Panay Island, 11°40' latitude and 122°30' longitude, Batan Bay has approximately 2,500 hectares with the average water depth of less than 5 meters during low tide. This bay consists of Port Batan, Banga Baylet and numerous tidal creeks. More than 80 percent of the coastal line in the bay is surrounded by mangrove areas and the rest is rocky or coconut forest. Shrimp fishing is considered an important fishery in Batan Bay. The main objectives of this survey are: 1) To know the species, particularly edible ones, of decapod crustaceae found in the mangrove and estuarine areas; 2) To know their ecology and life history; and 3) To provide the biological data available for protection or preservation of the mangrove area.
    • Technical Report

      Traditional devices and gear for collecting fry of "sugpo" giant tiger prawn, Penaeus monodon in the Philippines 

      H Motoh - 1980 - Aquaculture Department, Southeast Asian Fisheries Development Center
      Series: Technical report / SEAFDEC Aquaculture Department; No. 4
      Eight typical devices and gears for catching the wild fry of the giant tiger prawn, Penaeus monodon, locally called sugpo are described and illustrated. There are three stationary ones vis. fry lure, fry filter net and set fry trap, and five mobile ones viz. scoop net, fry scare line, fry seine, triangular net, and fry bulldozer. These have been used traditionally in the Philippines. This design and manner of operation are adapted to the behaviors and habits of the sugpo fry such as clinging and incursion with the incoming tidal current in mangrove creeks or at the mouth of the brackish river.
    • Article

      Traditional devices for capturing crabs used in the Philippines today 

      H Motoh - Researches on Crustacea, 1983 - Carcinological Society of Japan
      The author intends to illustrate and describe the indigenous devices traditionally used to capture crabs including the constructions and the operational manners. Also the present writing is hoped to play a role in disseminating the record of the unique devices among local Philippine people and continued use of them. It may be added that the biological significance related to these devices may worth to be recorded.