Circulatory system of shrimp and crustaceans.pptx

To study about circulatory system of shrimp

1. Circulatory system of shrimp By Asraf Ali.I,1 st year ,BFSC Dr.M.G.R fisheries college and research institute, Thalainayeru

2. Open circulatory system meaning that all their blood is not contained within vessels, instead, blood is drawn in to the heart through holes called ostia, then pumped out again to circulate through the tissues and return again to the heart.

3. Heart and pericardium The heart is a hollow organ
It is somewhat triangular in outline
Made up of thick muscular walls.
It is situated dorsally at the posterior end of the cephalothorax.
It is lodged in a special haemocoel

4. Ostia

5. Five pairs of valved Ostia are present on thewalls of the heart
- Ventral ostium: one pair a little behind the middleon the ventral surface, one on each side Dorsal ostium : second pair opposite to the firstpair on the dorsal surface;
- Posterior ostium: third pair on the posteriorborder ;
- Anterolateral ostium : fourth pair behind the apex
- Lateroposteroir ostium : fifth or the last pair, oneon each side of the lateral angle of the heart.

6. Pericardium Through these ostia, the blood flows into theheart from the surrounding area
It is otherwise called as pericardial sinus Pericardial cavity The walls of which forms the pericardium.
A horizontal pericardial septum forms the floor of the pericardial sinus.
A median cardio pyloric strand and 2 lateral strands support the heart in the pericardium.

7. Arteries These are thick-walled vessels, through which
the heart pumps out its contents.
Principal arteries are as follows;
- Median opthalmic - Antennary - Hepatic - Mid posterior

8. Two antennary arteries arise from the inner lateral sides of the heart
Behind the eyes, the arteries of the two sides anastomose and form a loop, the circulas cephalicus , with which the median ophthalmic artery joins.
From this loop comes off a rostral artery on each side.

9. Median opthalmic Single
Slender in nature
It arises from the apex of the heart
Runs forward mid dorsally along the renal sac,where it joins the two antennary arteries above the oesophagus

10. Antennary Antennary
A pair of antennary artery arises from the hearts apex, one on each outer side of opthalmic Runs along the outer border of the mandibular muscle
It bifurcates in to dorsal and ventral branch
Ventral branch: further divides to supply the antennule, antenna, renal organ

11. Dorsal branch Sends an optic artery to the eyes
It forms circular, loop like artery or circulus cephalicus , which gives off a pair of of rostral arteries to the rostrum Different branch sends from this antennary - Pericardial branch: pericardium
- Gastric branch: cardiac stomach
- Mandibular branch: mandibular muscle

12. Hepatic A pair of hepatic or hepatopancreatic artery arise from the heart ventrolaterally One on each side, just behind the antennary They plunge downwards into the hepatopancreas From it they divide and sub divide

13. Mid posterior Short but stout
Arise from the postero ventral surface of the heart
It bifurcates in to supra-intestinal and sternal artery

14. Supra-intestinal artery - Also called as dorsal abdominal artery
- Runs backwards from the dorsal surface of the intestine to the hind gut
- Supplies blood to the mid-gut and the dorsal abdominal muscles Sternal artery - Stoutest of all other arteries
- Runs downwards and forwards through the hepatopancreas - It gets divided into two branches

15. Ventral thoracic branch Runs anteriorly up to the mouth
It supplies the sternal region, first three pairs of walking legs, maxillae and maxillulae etc Ventral abdominal branch Runs posteriorly upto the anus Supplies blood to the ventral abdominal region, last two pairs of legs, pleopods and hind gut etc

16. Blood It is colourless Thin and watery fluid
Contains floating amoeboid white corpuscles or luecocytes which are phagocytic
There are no red blood cells
Respiratory pigment is haemocyanin , which is dissolved in the plasma
Metallic base is copper instead of iron
It becomes blue when combined with oxygen
It has remarkable clotting properties

17. Haemolymph The fluid equivalent to blood in most invertebrates occupying the haemocoel . Haemolymph of the prawn is a clear fluid having a number of colourless leucocytes.
The respiratory pigment is proteid haemocyanin .
The oxygenated haemolymph is shining blue, butcolourless when deoxygenated.
The main functions are to transport food and oxygen
The elimination of respiratory wastes in general,although a number of other functions are complimentary to these.

18. Blood sinuses Arteries repeatedly branch in various organs of the body
True capillaries and veins are absent
The minute arterial branches open freely into the blood sinuses or lacunae of the heamocoel Ventral sinuses :
All the sinuses of the body eventually meet into a pair of elongated and ill defined ventral sinuses
Lying below the hepatopancreas , on the floor of the thorax
Two ventral sinuses communicate with each other at various places

19. Blood channels These are lacunar tubes without proper walls
6 afferent branchial channels
It carries venous blood from each ventral sinus to the gills of that side, where it gets aerated
Run upwards along the inner side of the lateral thoracic wall and enter the gills through their gill roots
The first channel feeds the podobranch and the two arthrobranchs Remaining 5 channels supplies blood to pleurobranch The aerated blood is conveyed from the gills of each side to the pericardium through 6 efferent branchial channels

20. Course of blood circulation